CN215114922U - Remote wireless transmission thermometer - Google Patents
Remote wireless transmission thermometer Download PDFInfo
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- CN215114922U CN215114922U CN202121329250.1U CN202121329250U CN215114922U CN 215114922 U CN215114922 U CN 215114922U CN 202121329250 U CN202121329250 U CN 202121329250U CN 215114922 U CN215114922 U CN 215114922U
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Abstract
The utility model discloses a remote wireless transmission thermometer, including transmitter and receiver, the transmitter includes the transmitter master control MCU who is used for controlling the transmitter normal work, the transmitter power that is used for supplying power, the temperature detection circuit that is used for detecting the temperature, the transmitting circuit that is used for transmitting temperature signal to the receiver, the frequency correction circuit that is used for carrying out frequency correction to the transmitting signal of transmitting circuit; the receiver comprises a receiver main control MCU for controlling the normal work of the receiver, a receiver power supply for supplying power and a signal receiving circuit for receiving a temperature signal transmitted by a transmitter; the utility model discloses the frequency difference that the effectual reduction element of technical scheme brought makes the receipt emission distance effective distance of product stronger.
Description
Technical Field
The utility model relates to a thermometer technical field, in particular to remote wireless transmission thermometer.
Background
Because electronic components are produced in a quantitative mode, all the raw materials have corresponding tolerance ranges, the frequency difference of some standard crystal oscillators reaches the range value from +/-20 PPM to +/-30 PPM, the influence on the radio frequency mode of an ordinary RF product ASK is small, the error range of the ASK can be accepted when the ASK is applied to a short distance, but the optimal receiving and transmitting distance cannot be reached when a certain long-distance FSK radio frequency mode is designed, the intensity of received and transmitted signals of the product is attenuated, and the consistency of the product is low.
For most of the current 840MHz-960MHz RF wireless transmission thermometer products, their effective receiving distance for the alleged open area is generally between 100M (300FT) and 150M (500FT), and for products such as barbecue spit, most consumers are used to outdoor barbecue and cooking food, and the effective distance between 100M and 150M is enough for playing and cooking; however, some consumers cook at home and bake meat using an oven and a toaster, and the effect of effective transmission temperature of 100M (300FT) to 150M (500FT) may not be achieved when walking out of the yard, because RF wireless transmission has a certain barrier transmission loss rate, the transmission loss of a typical 40MM wooden door is about 2-3dB, and a 3dB reduction in radio frequency corresponds to the original 1/2 reduction in signal strength, whereas if several walls of the home cook the transmission loss is larger, the typical 100M (300FT) to 150M (500FT) cannot satisfy all consumers.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a remote wireless transmission thermometer aims at the frequency difference that effectual reduction element brought, makes the receipt emission distance effective distance of product stronger.
In order to achieve the above object, the utility model provides a remote wireless transmission thermometer, including transmitter and receiver, the transmitter includes the transmitter master control MCU who is used for controlling the transmitter normal work, the transmitter power that is used for supplying power, is used for detecting the temperature examine temperature circuit, is used for transmitting the temperature signal to the transmitting circuit of receiver, is used for carrying out the frequency correction's frequency correction circuit to the transmitting signal of transmitting circuit;
the voltage output end of the transmitter power supply is connected with the voltage input end of the transmitter main control MCU; the temperature detection circuit is connected with an external temperature sensor, and a temperature data output end of the temperature detection circuit is connected with a temperature data receiving end of the transmitter main control MCU; the temperature signal output end of the transmitter main control MCU is connected with the temperature signal receiving end of the transmitting circuit, and the transmitting circuit is connected with an external transmitting antenna for transmitting temperature signals; a transmitting signal reading end of the frequency correction circuit is connected with the transmitting circuit, and a frequency feedback end of the frequency correction circuit is connected with the transmitter main control MCU;
the receiver comprises a receiver main control MCU for controlling the normal work of the receiver, a receiver power supply for supplying power and a signal receiving circuit for receiving a temperature signal transmitted by a transmitter;
the voltage output end of the receiver power supply is connected with the voltage input end of the receiver main control MCU; the signal receiving circuit is connected with an external receiving antenna and used for receiving temperature signals transmitted by the transmitter, and the temperature signal output end of the signal receiving circuit is connected with the temperature signal receiving end of the receiver main control MCU.
Preferably, the transmitter main control MCU and the receiver main control MCU are respectively set as MCU processors of model N8P 082A.
Preferably, the transmitter power supply and the receiver power supply are respectively provided as two 3A batteries.
Preferably, the external temperature sensor is set as an NTC temperature sensor, the number of the NTC temperature sensors is set as two, and the temperature detection circuit includes a plurality of distributed resistors and a charge-discharge capacitor.
Preferably, the transmitting circuit comprises a transmitting power chip U1 of a model CMT2119A, and further comprises a main frequency crystal oscillator X1, a filter capacitor and an antenna matching inductor which are connected with the transmitting power chip U1.
Preferably, the frequency correction circuit comprises a frequency comparison chip U3 with model NP6533, a main frequency crystal oscillator X3 connected with the frequency comparison chip U3, and a filter capacitor.
Preferably, the signal receiving circuit comprises a receiving chip of the model CMT2217LB, and further comprises a main frequency crystal oscillator, a filter capacitor and an antenna matching inductor which are connected with the receiving chip.
Preferably, the transmitter and the receiver are respectively arranged on an LCD display screen for data display and a key for control operation.
Preferably, the receiver is further provided with a buzzer for alarming temperature.
Compared with the prior art, the beneficial effects of the utility model are that: the frequency correction circuit is added in the design circuit, and the frequency deviation of the product can be compared again when the finished product is completed and electrified for the first time, so that the receiving and transmitting frequency points of the product are adjusted inside, the frequency difference caused by elements is effectively reduced, and the receiving and transmitting distance of the product is longer than the effective distance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a working principle block diagram of the transmitter of the present invention;
fig. 2 is a block diagram of the working principle of the receiver of the present invention;
FIG. 3 is a schematic diagram of the transmitter main control MCU circuit of the present invention;
FIG. 4 is a schematic diagram of the temperature detection circuit of the present invention;
fig. 5 is a schematic diagram of the transmitting circuit of the present invention;
FIG. 6 is a schematic diagram of the frequency correction circuit of the present invention;
FIG. 7 is a schematic diagram of a receiver main control MCU circuit of the present invention;
fig. 8 is a schematic diagram of the signal receiving circuit of the present invention;
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The remote wireless transmission thermometer provided by the embodiment comprises a transmitter and a receiver, and referring to fig. 1, the transmitter comprises a transmitter main control MCU for controlling the normal operation of the transmitter, a transmitter power supply for supplying power, a temperature detection circuit for detecting temperature, a transmitting circuit for transmitting a temperature signal to the receiver, and a frequency correction circuit for performing frequency correction on the transmitting signal of the transmitting circuit;
the voltage output end of the transmitter power supply is connected with the voltage input end of the transmitter main control MCU; the temperature detection circuit is connected with an external temperature sensor, and a temperature data output end of the temperature detection circuit is connected with a temperature data receiving end of the transmitter main control MCU; the temperature signal output end of the transmitter main control MCU is connected with the temperature signal receiving end of the transmitting circuit, and the transmitting circuit is connected with an external transmitting antenna for transmitting temperature signals; a transmitting signal reading end of the frequency correction circuit is connected with the transmitting circuit, and a frequency feedback end of the frequency correction circuit is connected with the transmitter main control MCU;
referring to fig. 2, the receiver includes a receiver main control MCU for controlling the normal operation of the receiver, a receiver power supply for supplying power, and a signal receiving circuit for receiving a temperature signal transmitted by a transmitter;
the voltage output end of the receiver power supply is connected with the voltage input end of the receiver main control MCU; the signal receiving circuit is connected with an external receiving antenna and used for receiving temperature signals transmitted by the transmitter, and the temperature signal output end of the signal receiving circuit is connected with the temperature signal receiving end of the receiver main control MCU.
Further, referring to fig. 3 and 7, the transmitter main control MCU and the receiver main control MCU are respectively set as MCU processors of model N8P082A, and the transmitter power supply and the receiver power supply are respectively set as two 3A batteries to respectively supply power to the transmitter main control MCU and the receiver main control MCU.
Further, the outside temperature sensor sets up to NTC temperature sensor, just NTC temperature sensor's quantity sets up to two, refer to figure 4, examine two NTC temperature sensor of temperature circuit external connection, combine PCB cluster parallel distribution resistance regulation correction transmitter master control MCU to read resistance precision algorithm gradient, and temperature identification charge-discharge capacitance constitutes, through external environment or contact object temperature variation, make NTC temperature sensor resistance change, through distribution resistance correction resistance again, correct temperature value is discerned through the inside algorithm by transmitter master control MCU, pass again and output for the LCD display screen, the temperature value that shows at present detecting of numeralization.
Further, referring to fig. 5, the transmitting circuit includes a transmitting power chip U1 of a model CMT2119A, and further includes a main frequency crystal oscillator X1 connected to the transmitting power chip U1, a filter capacitor, and an antenna matching inductor. The temperature value read by the transmitter main control MCU transmits high and low level temperature value data to the transmitting power chip U1 through the serial port, then is internally identified and converted into an RF signal corresponding to a receiving frequency band by the transmitting power chip U1, and then is externally transmitted by the antenna amplification power, the frequency point value of the transmitting signal is corrected, so that the transmitting circuit sends the temperature signal value with the latest corrected frequency point to the receiver for reading.
Further, referring to fig. 6, the frequency correction circuit includes a frequency comparison chip U3 of model NP6533, a main frequency crystal X3 connected to the frequency comparison chip U3, and a filter capacitor. When the frequency correction circuit works, a frequency fixed point standard value is set by an internal algorithm of the frequency correction circuit, a standard command is transmitted to the transmitter main control MCU when the frequency correction circuit is powered on, a difference deviation value is compared with a main frequency algorithm of the transmitting power chip U1 and then fed back to the frequency comparison chip U3, the frequency feedback value is recompiled and directly acts on the transmitting power chip U1 through the transmitter main control MCU according to the comparison of the deviation value, so that the transmitting power chip U1 returns to a standard transmitting frequency value, when the frequency correction circuit is powered on and powered on, a frequency signal of a detected temperature value is transmitted by the transmitting circuit, a transmitting signal is read by the frequency correction circuit, a frequency difference deviation value compared by the internal algorithm is transmitted back to the transmitter main control MCU, and an editing signal is reset by the transmitter main control MCU and then is given to the transmitting circuit.
Further, referring to fig. 8, the signal receiving circuit includes a receiving chip of the type CMT2217LB, and further includes a main frequency crystal oscillator 28.6034MHz (27.1341MHz), a filter capacitor, and an antenna matching inductor connected to the receiving chip. When the temperature control circuit works, the RF signals of 915MHz (868.35MHz) frequency points of the transmitter are modulated, received and read corresponding temperature signals, and then the temperature signals are transmitted to the receiver main control MCU through the IO port. Reading the signal value by the receiver main control MCU, reading the signal value into numerical data, transmitting the numerical data to an LCD display screen, and displaying the temperature value detected by the current transmitter;
the key can set the unit constant mode conversion of temperature display, switch display backlight and turn off and turn on product display, set the pre-alarm value of various foods or BBQ barbecue mode, and display various settings by LCD display screen. When the temperature value reaches the set temperature value or exceeds the set range value, the receiver main control MCU transmits a processing signal to give an alarm to the buzzer to prompt that the current temperature reaches the set alarm value.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. A remote wireless transmission thermometer comprises a transmitter and a receiver, and is characterized in that the transmitter comprises a transmitter main control MCU for controlling the normal work of the transmitter, a transmitter power supply for supplying power, a temperature detection circuit for detecting temperature, a transmitting circuit for transmitting a temperature signal to the receiver, and a frequency correction circuit for correcting the frequency of a transmitting signal of the transmitting circuit;
the voltage output end of the transmitter power supply is connected with the voltage input end of the transmitter main control MCU; the temperature detection circuit is connected with an external temperature sensor, and a temperature data output end of the temperature detection circuit is connected with a temperature data receiving end of the transmitter main control MCU; the temperature signal output end of the transmitter main control MCU is connected with the temperature signal receiving end of the transmitting circuit, and the transmitting circuit is connected with an external transmitting antenna for transmitting temperature signals; a transmitting signal reading end of the frequency correction circuit is connected with the transmitting circuit, and a frequency feedback end of the frequency correction circuit is connected with the transmitter main control MCU;
the receiver comprises a receiver main control MCU for controlling the normal work of the receiver, a receiver power supply for supplying power and a signal receiving circuit for receiving a temperature signal transmitted by a transmitter;
the voltage output end of the receiver power supply is connected with the voltage input end of the receiver main control MCU; the signal receiving circuit is connected with an external receiving antenna and used for receiving temperature signals transmitted by the transmitter, and the temperature signal output end of the signal receiving circuit is connected with the temperature signal receiving end of the receiver main control MCU.
2. The remote wireless transmission thermometer of claim 1 wherein said transmitter master MCU and said receiver master MCU are each configured as a model N8P082A MCU processor.
3. A remote wireless transmission thermometer according to claim 1 wherein said transmitter power supply and said receiver power supply are each provided as two 3A batteries.
4. The remote wireless transmission thermometer of claim 1 wherein said external temperature sensor is configured as an NTC temperature sensor and the number of said NTC temperature sensors is configured as two, and said temperature detection circuit includes a plurality of distributed resistors and a charging and discharging capacitor.
5. The remote wireless transmission thermometer of claim 1 wherein said transmitting circuit includes a transmitting power chip U1 of model CMT2119A, a main frequency crystal X1 connected to said transmitting power chip U1, a filter capacitor, and an antenna matching inductor.
6. The remote wireless transmission thermometer of claim 1 wherein the frequency correction circuit comprises a model NP6533 frequency comparison chip U3, a main frequency crystal oscillator X3 connected to the frequency comparison chip U3, and a filter capacitor.
7. The remote wireless transmission thermometer of claim 1 wherein said signal receiving circuit comprises a receiving chip of type CMT2217LB, further comprising a primary frequency crystal oscillator, a filter capacitor, an antenna matching inductor connected to said receiving chip.
8. A remote wireless transmission thermometer according to any one of claims 1 to 7 wherein said transmitter and receiver are respectively provided on an LCD display screen for data display and keys for control operations.
9. A remote wireless transmission thermometer according to claim 8 wherein said receiver is further provided with a buzzer for providing a temperature alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121329250.1U CN215114922U (en) | 2021-06-15 | 2021-06-15 | Remote wireless transmission thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121329250.1U CN215114922U (en) | 2021-06-15 | 2021-06-15 | Remote wireless transmission thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215114922U true CN215114922U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121329250.1U Active CN215114922U (en) | 2021-06-15 | 2021-06-15 | Remote wireless transmission thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215114922U (en) |
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2021
- 2021-06-15 CN CN202121329250.1U patent/CN215114922U/en active Active
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