CN214843453U - Control circuit that intelligence bluetooth wireless water meter adopted - Google Patents
Control circuit that intelligence bluetooth wireless water meter adopted Download PDFInfo
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- CN214843453U CN214843453U CN202121266824.5U CN202121266824U CN214843453U CN 214843453 U CN214843453 U CN 214843453U CN 202121266824 U CN202121266824 U CN 202121266824U CN 214843453 U CN214843453 U CN 214843453U
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Abstract
A control circuit applied to an intelligent Bluetooth wireless water meter which can be in communication connection with a main node device in a broadcast communication mode in real time in the Internet of things of the water meter. The main control circuit comprises a main control chip U8, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, an angle detection chip U5, a Bluetooth chip U4 and a disposable 3.6V battery, wherein the Bluetooth chip in the main control circuit is in communication connection with the main node equipment in a broadcast communication mode, pairing authentication is not needed, data reporting and receiving are fast, the sending distance is long, and the transmission distance between the water meter and the main node equipment can reach 200 meters. 2) The Hall sensor group is adopted to ensure the small flow meter measurement monitoring, and the functions of mutual calibration of angular displacement direct reading and pulse electronic detection are realized. 3) The whole water meter operates with ultra-low power consumption, and a single battery can meet the requirement of the water meter on a mandatory verification regulation service cycle for 6 years.
Description
Technical Field
The utility model relates to a control circuit, in particular to be applied to control circuit that intelligent bluetooth wireless water meter adopted in the water gauge thing networking.
Background
In the intelligent wireless water meter, there are amateur frequency range wireless water meter, LORA wireless water meter, NB-IoT wireless water meter, IP remote water meter, Bluetooth wireless water meter.
The IP remote transmission water meter and the NB-IoT wireless water meter need to pay the charge of the flow card to a communication operator regularly, and when the data of the water meter is reported to the main equipment, the power consumption is larger due to the fact that a certain time is needed for searching a network (base station), the service life of a battery is influenced, and therefore the service life and the maintenance cost of the water meter are influenced. In order to prolong the service life of the battery, the single use time of the battery has to be reduced by adopting a mode of regularly copying and regularly reporting data, so that the service life of the battery is prolonged. This condition can't be to the target water gauge real-time data of reading, especially under the prepayment condition, after the owing closes the valve, can not in time open the valve, brings a great deal of inconvenience for using the customer, also consequently is complained the water supply department by the user frequently, to above problem, has also appeared the bluetooth wireless water gauge of real-time reported data in the market, but present bluetooth wireless water gauge has following problem:
1) the Bluetooth wireless water meter needs to be connected with a receiving device (hereinafter referred to as a master node device) in a pairing mode before sending information, and if the master device is far away or pairing information is not fed back, the Bluetooth wireless water meter cannot complete a task of sending related information to the master device, so that the reliability of information transmission is poor, and the stability is poor.
2) The Bluetooth wireless water meter adopting the pulse accumulation electromechanical conversion mode is easy to cause the deviation of pulse electronic accumulation count values and water meter mechanical character wheel count values in the long-time use process, the deviation can be superposed and continuously amplified along with the use time, so that the electromechanical synchronization of the water meter can not be realized, the longer the use time of the water meter is, the larger the deviation is, the inconsistent data which are remotely read and the actual water consumption are finally caused, and the situation often causes unnecessary disputes between users and managers.
The factors causing the deviation between the pulse electronic accumulated count value and the mechanical character wheel count value are many, such as in the use process, the water meter can cause the meter end meter to rotate forwards or backwards due to the phenomena of insufficient pipeline pressure, water hammer or shaking rotation and the like, the sensor for detecting the number of the rotating circles of the pointer can generate counting pulses, namely, the water meter can be used for water no matter rotates forwards or backwards, but the water meter does not really use water at the moment, the mechanical character wheel count of the water meter is not increased, and the pulse electronic counting part can count.
3) When the models of the Bluetooth chips used by a plurality of similar Bluetooth wireless water meters are different greatly or the models of the Bluetooth chips are different from the models of the Bluetooth chips used by the main node equipment, the compatibility problem exists, and the phenomenon that pairing cannot be performed easily occurs.
4) This kind of bluetooth wireless water meter is because need the manual work to carry out the meter and pair with the main node equipment, when the meter count is more, not only greatly increased the personnel's that check meter workload, but also need the personnel that check meter to have stronger responsibility heart and higher occupation literacy.
5) This type of bluetooth wireless water meter sets up to near field operating condition mostly, and communication distance is shorter, is 20 meters's within range at the diameter usually.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a be applied to the control circuit that can carry out communication connection's intelligent bluetooth wireless water meter adopts to the host node equipment with the broadcast communication mode in real time in the water gauge thing networking.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model discloses a control circuit that intelligence bluetooth wireless water gauge adopted, its characterized in that: the main control circuit comprises a main control chip U8, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, an angle detection chip U5, a Bluetooth chip U4 and a disposable 3.6V battery, wherein,
the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 respectively collect the measurement 10-4A low-order pointer electrical signal corresponding to the low-order pointer rotation information of the lowest-order gear of the cubic digital-order pointer is sent to the 20 th pin, the 2 nd pin and the 19 th pin of the main control chip U8 through corresponding pulse output ends;
the angle detection chip U5 collects the measurement 100Electric signals corresponding to position information of the unit character wheel in cubic magnitude are respectively transmitted to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin of the unit character wheel;
the master control chip U8 sends the meter number, character wheel group accumulated electronic count value and pointer group accumulated electronic count value of the water meter (1) to the 15 th pin and the 16 th pin of the Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin;
the 3.6V battery respectively outputs stable 3.0V direct current working voltage to the main control chip U8 and the Bluetooth chip U4 through the voltage stabilizing chip U6;
the main control chip U8 independently supplies power to the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through a 10 th pin, an 11 th pin and a 12 th pin respectively; the main control chip U8 supplies power to the angle detection chip U5 through the 16 th pin.
The main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
The master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
The main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor.
The main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
The 3.6V battery is a disposable lithium-thionyl chloride battery.
The utility model discloses a control circuit has following advantage and characteristics: 1) the bluetooth chip in its master control circuit communicates with the master node device in a broadcast communication mode (means: a digital second-pass gateway or a mobile phone held by a user and downloaded with special APP software) to carry out communication connection, pairing authentication is not needed, data reporting and receiving are fast, the sending distance is long, and the transmission distance between the water meter and the main node equipment can reach 200 meters. 2) The Hall sensor group is adopted to ensure the small flow meter measurement monitoring, and the functions of mutual calibration of angular displacement direct reading and pulse electronic detection are realized. 3) The whole water meter operates with ultra-low power consumption, and a single battery can meet the requirement of the water meter on a mandatory verification regulation service cycle for 6 years.
Drawings
Fig. 1 is using the utility model discloses control circuit's intelligent bluetooth wireless water meter's appearance sketch map.
Fig. 2 is a schematic view of the internal structure of fig. 1.
Fig. 3 is a sectional view taken along line a-a in fig. 1.
Figure 4 is a side view of the water meter.
FIG. 5 is a schematic view of FIG. 4 with the transparent watch cover removed.
Fig. 6 is a left side view of fig. 5.
Fig. 7 is a right side view of fig. 5.
Fig. 8 is a schematic view of the PCBA board of fig. 1.
Fig. 9 is a right side view of fig. 8.
Fig. 10 is a schematic circuit diagram of the main control circuit of the present invention.
Fig. 11 is an enlarged schematic view of a schematic diagram of block a in fig. 10.
Fig. 12 is an enlarged schematic view of a schematic diagram of block B in fig. 10.
The reference numbers are as follows:
the water meter comprises a water meter 1, a meter case 2, an impeller box 3, an impeller 31, a counter box 4, a lower clamping plate 41, an upper clamping plate 42, a gear transmission component 5, a lowest gear 51, a monitoring pointer 52, a gear set 53, a character wheel set 6, a unit character wheel 61, a middle driving coupling wheel 62, a pointer disc 63, a transmission intermediate wheel 7, a transparent meter cover 8, a direct reading window hole 81, a PCBA board 9, a detection part 91, an angle sensor 92, a permanent magnetic sheet 93, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, a wireless Bluetooth chip U4, an angle detection chip U5, a voltage stabilizing chip U6 and a main control chip U8.
Detailed Description
As shown in fig. 1, use the utility model discloses control circuit's intelligent bluetooth wireless water meter 1 includes mechanical structure and sets up the master control circuit wherein.
Mechanical structure of intelligent Bluetooth wireless water meter (hereinafter referred to as water meter 1)
The water meter 1 is a water meter in which a direct reading counter and a pointer counter are combined, the direct reading counter is a counter for directly reading a flow value displayed by a number, and the pointer counter is a counter for displaying the flow value by indicating the flow value by using a pointer.
As shown in fig. 1, fig. 2, fig. 3, and fig. 4, the water meter 1 includes, from bottom to top, a meter case 2, an impeller case 3, an impeller 31, a counter case 4, a lower clamp plate 41, a gear transmission assembly 5, a gear train 53, a monitoring pointer 52, a character wheel group 6, a middle drive coupling wheel 62, a transmission intermediate wheel 7, an upper clamp plate 42, a transparent meter cover 8, and a PCBA board 9 provided with a main control circuit.
The impeller case 3 is installed in the case 2, the impeller 31 is placed in the impeller case 3, and when the metered aqueous medium flows through the impeller case 3, the flowing aqueous medium stirs the impeller 31 to rotate. The counter box 4 is mounted on the impeller box 3 in a sealed isolation from the impeller box 3, i.e. a sealing rubber ring is mounted between the counter box 4 and the impeller box 3 to prevent water in the impeller box 3 from entering the counter box 4.
The upper clamping plate 42 and the lower clamping plate 41 are arranged in the counter box 4, the gear transmission assembly 5 and the character wheel group 6 are arranged between the upper clamping plate 42 and the lower clamping plate 41, and the upper end of the impeller 31 penetrates through the counter box 4 and is meshed with the lowest-order driving gear in the gear transmission assembly 5 through a driving wheel.
The character wheel group 6 is composed of a plurality of character wheels which display high-order metering numerical values capable of being directly read (direct reading means that data is directly read by naked eyes) by numbers, and each character wheel in the character wheel group 6 is arranged in parallel from small to large and comprises units, tens, hundreds, thousands and tens of thousands (namely 100-10 of the display is displayed)4m3The five orders of magnitude, also can set up more orders of magnitude) order of magnitude character wheel, all order wheels are assembled on the order wheel axle, set up 0-9 digital characters on the circumference lateral wall of each order wheel at equidistant interval in proper order, there is carry coupling wheel between two adjacent order wheels, the low order turns round, adjacent high order rotates a number.
A direct reading window hole 81 for reading the counting value of each character wheel is arranged on the upper clamping plate 42 at the position corresponding to each character wheel in the character wheel group 6.
As shown in FIG. 5, a plurality of pointers which display low-level metering values in a pointer rotation mode, such as one tenth, one hundredth, one thousandth and one ten thousandth meter order (i.e. 10), are arranged at positions opposite to the character wheel set 6 under the transparent watch cover 8-1-10-4m3Of four cubic orders of magnitude) each of which is solidly connected to a single-order drive gear in said gear transmission assembly 5, the drive gear corresponding to a ten-thousandth counting hand being referred to hereinafter as the lowest-order gear 51.
As shown in fig. 1, 2, 3, 4, 5, 8, and 9, a monitoring pointer 52 reflecting whether the metered fluid flows or not is provided under the transparent cover and beside the pointer disk 63, and the monitoring pointer rotates synchronously with the lowest gear 51 through a gear set 53 at the lower end thereof, and the transmission ratio therebetween is 1: 1.
as shown in fig. 3, 5, 6, 7, the highest magnitude (10) is driven in the gear assembly 5-1Cubic meter magnitude) and a transmission intermediate wheel 7 and a middle drive coupling wheel 62 are arranged between the drive gear of the pointer and the unit character wheel 61 in the character wheel group 6.
The transmission intermediate wheel 7 is meshed with the driving gear for driving the pointer with the highest magnitude, and the transmission ratio between the transmission intermediate wheel and the driving gear is 1: 10 (namely, the driving gear driving the pointer with the highest magnitude rotates ten times, the transmission intermediate wheel 7 rotates one time), meanwhile, the transmission intermediate wheel 7 is meshed with the middle driving coupling wheel 62, the middle driving coupling wheel 62 is parallel and coaxial with the character wheel group 6, wherein, the transmission intermediate wheel 7 is meshed with the middle driving coupling wheel 62 in an axis crossing mode.
The transmission ratio among the transmission intermediate wheel 7, the middle driving coupling wheel 62 and the unit character wheel 61 is 1: 1: 1.
namely, the transmission intermediate wheel 7 rotates for one circle, the middle driving coupling wheel 62 rotates for one circle, and the unit character wheel 61 also rotates for one circle.
A permanent magnet piece 93 having opposite magnetic poles is fixed to the center of the upper surface (i.e., spoke surface) of the transmission intermediate wheel 7, and a magnetically inductive angle sensor 92 (i.e., an angle detection chip U5 in the circuit) is correspondingly provided at a position opposite to the permanent magnet piece 93 outside the transparent cover 8. The angle sensor 92 can capture the rotating angle position of the permanent magnet 93 in real time, so as to obtain the position information of the idle gear (i.e. the rotating position of the transmission idle gear 7, which corresponds to the digital information of the direct reading window 81 of the water meter 1 on the unit number wheel 61). That is, when the permanent magnet 93 rotates 0.1, 0.2, half … or 0.9 turns from the initial position (0 number) along with the transmission intermediate wheel 7, the angle sensor 92 can detect that the number on the unit character wheel 61 facing the direct reading window 81 of the water meter 1 corresponds to 1, 2, 5 … or 9 respectively.
The utility model discloses an angle sensor 92's angle detection precision can be little to 0.1 degree.
In the gear transmission assembly 5, from small to large, the transmission ratio between two adjacent low-position metering drive gears is 10: 1 (i.e. ten revolutions of the low pointer and one revolution of the adjacent high pointer).
A detecting member 91 capable of detecting the rotation information of the lower pointer of the lowest gear 51 is provided at a position corresponding to the monitoring pointer 52 on the transparent watch cover 8, and the rotation information of the lower pointer is: when the lowest gear 51 rotates, information of forward rotation (forward direction refers to the rotation direction of the impeller 31 when the water meter 1 uses water normally), information of reverse rotation (reverse direction refers to the reverse rotation of the impeller 31 caused by external interference factors or the reverse rotation of the impeller 31 caused by the deliberate action of an individual water thief), information of micro-rotation caused by the shake of the impeller 31 caused by the external interference, and information of the number of rotations corresponding to the forward rotation and the reverse rotation.
The detection part 91 will the low level pointer signal of telecommunication that the rotatory information of low level pointer corresponds send for main control chip U8, after being discriminated by this main control chip U8 again (getting rid of because of the electronic count of shake and reverse rotation production), send the pointer signal of telecommunication that table number and the pointer group accumulative electronic count value of this wireless water gauge 1 correspond to main node equipment (main node equipment includes digital second water meter gateway, downloads and has special APP software and for the mobile terminal that the user held) with the broadcast communication mode through bluetooth chip U4 wherein.
The accumulated electronic count value of the pointer group refers to the low level collected by the main control chip U8 according to the detection unit 91Meter 10 with calculated pointer rotation information－1、10－2、10－3And 10－4An electronic count of cubic magnitude pointers.
The detecting member 91 may be a hall sensor assembly, a photoelectric sensor assembly, a mechanical sensor assembly, or the like. The utility model discloses preferred determine module is hall sensor assembly, and this hall sensor assembly comprises three hall sensor (three hall chip promptly), and is corresponding, is equipped with the permanent magnetic path of detection usefulness on monitoring pointer 52, and three hall sensor encircles this monitoring pointer and distributes in its periphery, and the contained angle between two adjacent hall sensor is preferred 120 degrees among the three hall sensor.
The three Hall sensors are arranged, so that the gear 51 at the lowest position can be effectively identified to rotate in the forward direction or the reverse direction, and meanwhile, the micro-rotation phenomenon of the gear 51 at the lowest position caused by the shaking of the pipeline can be accurately and timely captured.
The output sequence of the pulse generated by the three Hall sensors corresponding to the forward rotation and the reverse rotation is different. And when the sensor shakes slightly, the lowest gear 51 mostly reciprocates and slowly rotates back and forth at the rest position, and at least one of the three hall sensors does not output a pulse signal because the lowest gear 51 does not do complete circular motion.
After the detecting component 91 detects that the lowest gear 51 is in a normal rotation state, the angle sensor 92 sends the intermediate wheel electric signal corresponding to the acquired intermediate wheel position information to a main control chip U8 in a main control circuit at regular time.
Master control chip U8 will use through the bluetooth chip U4 in this master control circuit the utility model discloses the character wheel signal of telecommunication that control circuit's intelligent bluetooth wireless water meter 1's table number and character wheel group accumulation electronic count value correspond is regularly sent for distance this wireless water meter 1 to 200 meters with the broadcast communication mode master node equipment.
The accumulated electronic count value of the word wheel group is the measurement 10 calculated by the main control chip U8 according to the position information of the intermediate wheel collected by the angle sensor 92 and the accumulated number of rotations of the intermediate wheel0、101、102、103And 104An electronic count of a cubic order print wheel.
In order to reduce the accumulated error between the pointer group accumulated electronic count value and the character wheel group accumulated electronic count value caused by external interference factors, when the intermediate wheel position information sent to the main control chip U8 by the angle sensor 92 is that the unit character wheel 61 rotates to a positive numerical value (the positive numerical value is that the number on the unit character wheel 61, which faces the direct reading window 81 of the water meter 1, is 0, 1, 2, … or 9), the main control chip U8 clears the accumulated electronic count value of the pointer group stored therein, and then the three hall sensors accumulate and count again.
The purpose of the zero clearing is to realize mutual calibration of the accumulated count value of the pointer group and the accumulated electronic count value of the word wheel group. Theoretically, when the accumulated electronic count value of the pointer group reaches 1000 liters, the number corresponding to the direct reading of the unit character wheel 61 should reach 1 cubic meter; in fact, due to the interference of external factors, generally, when the unit digit wheel 61 directly reads to 1 cube, the corresponding pointer group accumulated electronic count value is often about 1000 liters, and in order to eliminate the counting error caused by the pointer group accumulated electronic count value, when the unit digit wheel 61 directly reads to the normal digit value, the pointer group accumulated electronic count value is cleared to zero, so that the error is prevented from being amplified infinitely in the long-time use process, and therefore the accurate metering of the whole water meter 1 is ensured, and the requirement of a client on accurate metering is met.
Second, master control circuit
As shown in fig. 10, 11 and 12, the main control circuit includes a main control chip U8, a pulse sampling circuit, an angular displacement direct-reading sampling circuit, a bluetooth transceiver circuit and a disposable 3.6V battery.
1. Pulse sampling circuit
The Hall sensor group comprises three Hall chips, namely a first Hall chip U1, a second Hall chip U2 and a third Hall chip U3.
Three Hall elements are adopted to realize forward and reverse rotation metering and a pointer of 0.0001 cubic meter of the sampling water meter, so that 1 liter can be metered, and the transient flow can be monitored.
The first hall chip U1, the second hall chip U2, and the third hall chip U3 respectively send the collected electric pulse signals (i.e., the low pointer electric signals) corresponding to the rotation number and the rotation direction of the lowest gear 51 to the 20 th pin, the 2 nd pin, and the 19 th pin of the main control chip U8 through the corresponding pulse output terminals.
The main control chip U8 supplies power to the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through pins 10, 11 and 12 respectively, and power consumption of the circuit is reduced.
When water flows in the water meter 1, the three Hall chips sequentially sense the magnetic field intensity of the magnet, the three Hall chips sequentially output low levels to the main control chip U8 due to the sufficient magnetic field intensity, and the interruption trigger circuit in the main control chip U8 triggers the number of interruption counting pulses, so that the elevating metering is realized.
2. Angular displacement direct-reading sampling circuit
The water meter reading device mainly comprises an angle detection chip U5, wherein the angle detection chip U5 is used for detecting the rotation angle value of the unit number wheel 61 of the water meter, namely, the reading of the unit number wheel 61 is sampled, and the water meter 1 is ensured not to generate accumulated errors in long-term use.
The angle detection chip U5 transmits the collected electric signal of the intermediate wheel to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin of the angle detection chip U5 respectively.
When the main control chip U8 reads the position information of the intermediate wheel, the 16 th pin supplies power to the angle detection chip U5, so that the power consumption of the whole circuit can be effectively reduced.
When the unit character wheel 61 of the water meter 1 rotates, the angle detection chip U5 outputs a voltage signal (ADX +, ADY +, namely a medium wheel electric signal) which forms sine and cosine relations with the angle of the magnetic field, the voltage signal is transmitted to the main control chip U8 through the 3 rd pin and the 5 th pin of the voltage signal, and the indicating value of the current unit character wheel 61 is calculated through the main control chip U8, so that the direct reading function of the unit character wheel 61 is realized.
3. Bluetooth transceiver circuit
Mainly comprises a wireless Bluetooth chip U4 which is controlled by a main control chip U8 to perform wireless data exchange with the main node device. Which connects to the master node device via broadcast communication (i.e., without pairing).
The master control chip U8 sends the meter number and the character wheel group accumulated electronic count value of the water meter 1 to the 15 th pin and the 16 th pin of the wireless Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin of the master control chip U8, and the wireless Bluetooth chip U4 sends the meter number and the character wheel group accumulated electronic count value to the master node equipment in a broadcast communication mode;
similarly, the wireless bluetooth chip U4 may also forward the received data signal sent by the master node device and reset the relevant parameters of the wireless water meter 1 (the relevant parameters include the detection period setting of the angle sensor 92, the opening or closing of the water valve, the detection of the battery power consumption, and the bluetooth signal strength setting) to the master control chip U8.
The main control chip U8 controls the conduction of the CMOS switch tube Q1 through its 7 th pin, so that the battery provides a stable 3.0V operating voltage for the wireless bluetooth chip U4.
A main frequency crystal oscillation circuit of the wireless Bluetooth chip U4 is composed of a capacitor C29, a capacitor C30 and a capacitor Y1.
The clock crystal oscillating circuit of the wireless Bluetooth chip U4 is composed of a capacitor C19, a capacitor C20 and a Y3.
4. Pi-type antenna ANT matching circuit
The main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
5. Filter circuit of bluetooth transceiver circuit
The master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
6. Voltage detection circuit
The main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor. The main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the wireless Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
7. Battery with a battery cell
A 3.6V disposable lithium-thionyl chloride cell is preferred.
The battery outputs stable direct current working voltage to the main control chip U8 through the voltage stabilizing chip U6.
Claims (6)
1. The utility model provides a control circuit that intelligence bluetooth wireless water meter adopted which characterized in that: the main control circuit comprises a main control chip U8, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, an angle detection chip U5, a Bluetooth chip U4 and a disposable 3.6V battery, wherein,
the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 respectively collect the measurement 10-4A low-order pointer electrical signal corresponding to the low-order pointer rotation information of the lowest-order gear (51) of the cubic digital-order pointer is sent to the 20 th pin, the 2 nd pin and the 19 th pin of the main control chip U8 through corresponding pulse output ends;
the angle detection chip U5 collects the measurement 100Electric signals corresponding to position information of the cubic-order units character wheel (61) are respectively transmitted to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin;
the master control chip U8 sends the meter number, character wheel group accumulated electronic count value and pointer group accumulated electronic count value of the water meter (1) to the 15 th pin and the 16 th pin of the Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin;
the 3.6V battery respectively outputs stable 3.0V direct current working voltage to the main control chip U8 and the Bluetooth chip U4 through the voltage stabilizing chip U6;
the main control chip U8 independently supplies power to the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through a 10 th pin, an 11 th pin and a 12 th pin respectively; the main control chip U8 supplies power to the angle detection chip U5 through the 16 th pin.
2. The control circuit that intelligence bluetooth wireless water meter adopted according to claim 1, characterized in that: the main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
3. The control circuit that intelligent bluetooth wireless water meter adopted according to claim 2, characterized in that: the master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
4. The control circuit that intelligent bluetooth wireless water meter adopted according to claim 3, characterized in that: the main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor.
5. The control circuit that intelligent bluetooth wireless water meter adopted according to claim 4, characterized in that: the main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
6. The control circuit that intelligent bluetooth wireless water meter adopted according to claim 5, characterized in that: the 3.6V battery is a disposable lithium-thionyl chloride battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121266824.5U CN214843453U (en) | 2021-06-07 | 2021-06-07 | Control circuit that intelligence bluetooth wireless water meter adopted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121266824.5U CN214843453U (en) | 2021-06-07 | 2021-06-07 | Control circuit that intelligence bluetooth wireless water meter adopted |
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| Publication Number | Publication Date |
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| CN214843453U true CN214843453U (en) | 2021-11-23 |
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