CN210573256U - Novel atmospheric pressure detection module - Google Patents
Novel atmospheric pressure detection module Download PDFInfo
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- CN210573256U CN210573256U CN201920939177.6U CN201920939177U CN210573256U CN 210573256 U CN210573256 U CN 210573256U CN 201920939177 U CN201920939177 U CN 201920939177U CN 210573256 U CN210573256 U CN 210573256U
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Abstract
The utility model belongs to the technical field of circuit control, especially, relate to a novel atmospheric pressure detection module. The device comprises a main control circuit, a serial port circuit, a power conversion circuit and a power interface which are connected in sequence; the air pressure sensor is respectively connected with the main control circuit and the power supply conversion circuit, and the power supply indication circuit is connected with the power supply conversion circuit. Through circuit optimization design, the air pressure sensor is respectively connected with the power supply and the main control circuit to obtain high-sensitivity signals. And pull-up resistors are arranged on the control chip and the air pressure sensor chip and are used for enhancing the anti-interference capability of the whole circuit.
Description
Technical Field
The utility model belongs to the technical field of circuit control, especially, relate to a novel atmospheric pressure detection module.
Background
The air pressure sensor is directly connected with the signal input end on the market, and by adopting the mode, the obtained driving current is small, and the measured data is not accurate. Many automobiles are also provided with air pressure detectors, and the number of electronic instruments on the automobiles is large, so that the automobiles are easily subjected to electromagnetic interference.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, the present invention solves the above technical problems.
A novel atmospheric pressure detection module is characterized by comprising a main control circuit, a serial port circuit, a power supply conversion circuit, a power supply indicating circuit, an air pressure sensor and a power supply interface, wherein the main control circuit, the serial port circuit, the power supply conversion circuit and the power supply interface are sequentially connected; the signal output end of the air pressure sensor is connected with the main control circuit, the power supply input end of the air pressure sensor is connected with the power supply conversion circuit, and the power supply indication circuit is connected with the power supply conversion circuit; the main control circuit, the serial port circuit, the power conversion circuit, the power indication circuit, the power interface and the air pressure sensor are arranged on the circuit board. The air pressure sensor is powered by the power supply conversion circuit, so that a high-sensitivity signal can be output, the detected signal is more accurate, and the control of the main control circuit is more sensitive.
Preferably, the main control circuit comprises a control chip LGT8FX8, a RESET pin connection button S1 of the control chip LGT8FX8, a pull-up resistor R1 connected to the RESET pin of the control chip LGT8FX8, and a large-capacity capacitor C1 and a small-capacity capacitor C3 connected in parallel to the GND pin and the VCC pin of the control chip LGT8FX 8. The button S1 is set at the RESET pin of the control chip LGT8FX8 for program restart. And a pull-up resistor R1 is also arranged on the RESET pin and used for enhancing the anti-interference capability of the main control circuit. And a capacitor C1 and a capacitor C3 are arranged between the VCC pin and the GND pin and used for filtering the input voltage.
Preferably, the air pressure sensor adopts a BMP180 chip, pins 5 and 6 of the BMP180 chip are used for connecting a main control circuit, pull-up resistors R5 and R6 are respectively arranged on the pins 5 and 6 of the BMP180 chip, the resistors R5 and R6 are powered by a power conversion circuit, and a short-circuit bonding pad JP1 is arranged between the resistor R5 and the resistor R6 and between the power conversion circuit; pin 2 is connected to the power conversion circuit, and a small-capacity capacitor C11 and a large-capacity capacitor C12 are provided on pin 2. A pull-up resistor R5 and a resistor R6 are respectively arranged on an SCL pin and an SDA pin of the BMP180 chip, a short-circuit pad JP1 is arranged between the pull-up resistor R5, the resistor R6 and a 3.3V power supply, and the pull-up resistor R5 and the resistor R6 can be short-circuited through the short-circuit pad JP1 to control whether the pull-up resistor R5 and the resistor R6 are enabled or not. The VDD pin of the BMP180 chip is connected with 3.3V voltage, and a large-capacity capacitor C12 and a small-capacity capacitor C11 are further arranged on the VDD pin and used for filtering output voltage and enhancing the anti-interference capability of the sensor circuit.
Preferably, the serial port circuit comprises a chip HT42B534, pins 1 and 2 of the chip HT42B534 are connected with a USB interface, and a VBUS pin of the USB interface is connected with a power supply interface through a fuse F1; a capacitor C2 is connected between pins 4 and 16 of the chip HT42B 534; the pins 3 and 10 are respectively provided with a capacitor C5 and a capacitor C4. The VDDIO pin and the V33O pin of the chip HT42B534 are grounded through a capacitor C4 and a capacitor C5, respectively, for filtering. A capacitor C2 is connected between the GND pin and the VDD pin of the chip HT42B534 for filtering the input voltage. Through the USB interface, can be used to the program download and connect external power. A fuse F1 is disposed on the VBUS pin of the USB interface for protecting the chip HT42B534 from being burned.
The power conversion circuit adopts a chip NCP1117, a pin 3 of the chip NCP1117 is connected with a power interface, and the pin 3 is grounded through a capacitor C10; pin 2 of the chip NCP1117 is connected to the voltage output interface, and the chip NCP1117 is grounded through a capacitor C9. A capacitor C10 and a capacitor C9 are respectively arranged at the voltage input end IN and the voltage output end OUT of the chip NCP1117 and are used for filtering input voltage and output voltage respectively through a capacitor C10 and a capacitor C9. The detection system is further provided with a power supply switching circuit, the power supply switching circuit adopts a short-circuit bonding pad JP3 of a model JUMPER, the middle of the short-circuit bonding pad JP3 is connected with VCC, and two ends of the short-circuit bonding pad JP3 are respectively connected with VBUS (5V voltage) and 3.3V voltage. The selection of whether to connect a 5V supply voltage or a 3.3V stepped-down voltage is made via the shorting pad JP 3.
Preferably, the power supply indicating circuit comprises an indicator lamp U $7, a protective resistor R3 and a short-circuit pad JP1 which are connected in sequence, and the other end of the short-circuit pad JP1 is connected with the power supply conversion circuit. The power indicator is used for indicating whether the circuit is connected with a power supply or not through an indicator lamp U $7 in the power indicator circuit. Set up short circuit pad JP1 at access power supply switching circuit end, short circuit pad JP1 also can be replaced by the switch, closes power indicator circuit through short circuit pad JP1 to can close pilot lamp U $7, reach the effect of energy saving.
The utility model discloses owing to adopted above technical scheme, have apparent technological effect: the air pressure sensor is respectively connected with the power supply and the main control circuit and used for obtaining high-sensitivity signals. And pull-up resistors are arranged on the control chip and the air pressure sensor chip and are used for enhancing the anti-interference capability of the whole circuit. Power-on boost may be provided by the power indication circuit. The serial port circuit is used for downloading data and can be used for testing.
Drawings
Fig. 1 is a circuit block diagram of the detection system of the present invention.
Fig. 2 is a circuit diagram of the main control chip of the detection system of the present invention.
Fig. 3 is a circuit diagram of the air pressure sensor of the detection system of the present invention.
Fig. 4 is a serial communication circuit diagram of the detection system of the present invention.
Fig. 5 is a voltage-reducing circuit diagram of the detection system of the present invention.
Fig. 6 is a circuit diagram of the power supply indicating circuit of the detecting system of the present invention.
Fig. 7 is a circuit diagram of the power switching of the detection system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1. A novel atmospheric pressure detection module comprises a main control circuit, a serial port circuit, a power supply conversion circuit, a power supply indicating circuit, an air pressure sensor and a power supply interface, wherein the main control circuit, the serial port circuit, the power supply conversion circuit and the power supply interface are sequentially connected; the signal output end of the air pressure sensor is connected with the main control circuit, the power supply input end of the air pressure sensor is connected with the power supply conversion circuit, and the power supply indication circuit is connected with the power supply conversion circuit; the main control circuit, the serial port circuit, the power conversion circuit, the power indication circuit, the power interface and the air pressure sensor are arranged on the circuit board. The power interface is used for connecting an external 5V power supply, and the 5V power supply can directly supply power for the serial port circuit. In addition, the power conversion circuit is connected with the power interface, converts the external 5V voltage into 3.3V voltage, and is used for providing 3.3V voltage for the main control circuit, the power indication circuit and the air pressure sensor.
In this embodiment, as shown in fig. 2, the main control circuit includes a control chip LGT8FX8, a RESET pin connection button S1 of the control chip LGT8FX8, a pull-up resistor R1 connected to the RESET pin of the control chip LGT8FX8, and a large-capacity capacitor C1 and a small-capacity capacitor C3 connected in parallel to the GND pin and the VCC pin of the control chip LGT8FX 8. The button S1 is set at the RESET pin of the control chip LGT8FX8 for program restart. And a pull-up resistor R1 is also arranged on the RESET pin and used for enhancing the anti-interference capability of the main control circuit. And a capacitor C1 and a capacitor C3 are arranged between the VCC pin and the GND pin and used for filtering the input voltage. A diode U $2 is also provided in parallel across the pull-up resistor R1 for fast recovery after program reset is complete.
In this embodiment, as shown in fig. 3, the air pressure sensor adopts a BMP180 chip, pins 5 and 6 of the BMP180 chip are used to connect the main control circuit, pull-up resistors R5 and R6 are respectively arranged on pins 5 and 6 of the BMP180 chip, resistors R5 and R6 are powered by the power conversion circuit, and a short-circuit pad JP1 is arranged between the resistor R5 and the resistor R6 and the power conversion circuit; pin 2 is connected to the power conversion circuit, and a small-capacity capacitor C11 and a large-capacity capacitor C12 are provided on pin 2. A pull-up resistor R5 and a resistor R6 are respectively arranged on an SCL pin and an SDA pin of the BMP180 chip, the other ends of the pull-up resistor R5 and the resistor R6 are connected with a 3.3V power supply, a short-circuit pad JP1 is arranged among the pull-up resistor R5, the resistor R6 and the 3.3V power supply, and the pull-up resistor R5 and the resistor R6 can be short-circuited or the pull-up resistor R5 and the resistor R6 can be started through the short-circuit pad JP 1. The VDD pin of the BMP180 chip is connected to a voltage of 3.3V, and a large-capacity capacitor C12 and a small-capacity capacitor C11 are provided on the VDD pin, where the large-capacity capacitor C12 is 10uf and the small-capacity capacitor C11 is 0.1 uf.
In this embodiment, as shown in fig. 4, the serial port circuit includes a chip HT42B534, pins 1 and 2 of the chip HT42B534 are connected to a USB interface, and a VBUS pin of the USB interface is connected to a power supply interface through a fuse F1; a capacitor C2 is connected between pins 4 and 16 of the chip HT42B 534; the pins 3 and 10 are respectively provided with a capacitor C5 and a capacitor C4. The VDDIO pin and the V33O pin of the chip HT42B534 are grounded through a capacitor C4 and a capacitor C5, respectively, for filtering. A capacitor C2 is connected between the GND pin and the VDD pin of the chip HT42B534 for filtering the input voltage. Through the USB interface, can be used to the program download and connect external power. A fuse F1 is disposed on the VBUS pin of the USB interface for protecting the chip HT42B534 from being burned. A0 capacitor C8 is arranged between the DTR pin of the chip HT42B534 and the RESET pin of the control chip LGT8FX8 and is used for automatic RESET during a downloading program.
In this embodiment, as shown in fig. 5 and 7, the power conversion circuit employs a chip NCP1117, pin 3 of the chip NCP1117 is connected to the power interface, and pin 3 is grounded through a capacitor C10; pin 2 of the chip NCP1117 is connected to the voltage output interface, and the chip NCP1117 is grounded through a capacitor C9. A capacitor C10 and a capacitor C9 are respectively arranged at the voltage input end IN and the voltage output end OUT of the chip NCP1117 and are used for filtering input voltage and output voltage respectively through a capacitor C10 and a capacitor C9. The detection system is further provided with a power supply switching circuit, the power supply switching circuit adopts a short-circuit bonding pad JP3 of a model JUMPER, the middle of the short-circuit bonding pad JP3 is connected with VCC, and two ends of the short-circuit bonding pad JP3 are respectively connected with VBUS (5V voltage) and 3.3V voltage. The selection of whether to connect a 5V supply voltage or a 3.3V stepped-down voltage is made via the shorting pad JP 3.
In this embodiment, as shown in fig. 6, the power indicator circuit includes an indicator light U $7, a protection resistor R3, and a short pad JP1, which are connected in sequence, and the other end of the short pad JP1 is connected to the power converter circuit. The power indicator is used for indicating whether the circuit is connected with a power supply or not through an indicator lamp U $7 in the power indicator circuit. Set up short circuit pad JP1 at access power supply switching circuit end, short circuit pad JP1 also can be replaced by the switch, closes power indicator circuit through short circuit pad JP1 to can close pilot lamp U $7, reach the effect of energy saving.
In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a novel atmospheric pressure detection module which characterized in that: the device comprises a main control circuit, a serial port circuit, a power supply conversion circuit, a power supply indicating circuit, an air pressure sensor and a power supply interface, wherein the main control circuit, the serial port circuit, the power supply conversion circuit and the power supply interface are sequentially connected; the signal output end of the air pressure sensor is connected with the main control circuit, the power supply input end of the air pressure sensor is connected with the power supply conversion circuit, and the power supply indication circuit is connected with the power supply conversion circuit; the main control circuit, the serial port circuit, the power conversion circuit, the power indication circuit, the power interface and the air pressure sensor are arranged on the circuit board.
2. The novel atmospheric pressure detection module of claim 1, wherein: the main control circuit comprises a control chip LGT8FX8, a RESET pin connecting button S1 of the control chip LGT8FX8, a pull-up resistor R1 connected to the RESET pin of the control chip LGT8FX8, and a large-capacity capacitor C1 and a small-capacity capacitor C3 connected to the GND pin and the VCC pin of the control chip LGT8FX8 in parallel.
3. The novel atmospheric pressure detection module of claim 1 or 2, wherein: the pressure sensor adopts a BMP180 chip, pins 5 and 6 of the BMP180 chip are used for connecting a main control circuit, pull-up resistors R5 and R6 are respectively arranged on the pins 5 and 6 of the BMP180 chip, the resistors R5 and R6 supply power through a power conversion circuit, and a short-circuit bonding pad JP1 is arranged between the resistor R5 and the resistor R6 and between the power conversion circuit; pin 2 is connected to the power conversion circuit, and a small-capacity capacitor C11 and a large-capacity capacitor C12 are provided on pin 2.
4. The novel atmospheric pressure detection module of claim 1 or 2, wherein: the serial port circuit comprises a chip HT42B534, pins 1 and 2 of the chip HT42B534 are connected with a USB interface, and a VBUS pin of the USB interface is connected with a power supply interface through a fuse F1; a capacitor C2 is connected between pins 4 and 16 of the chip HT42B 534; the pins 3 and 10 are respectively provided with a capacitor C5 and a capacitor C4.
5. The novel atmospheric pressure detection module of claim 1 or 2, wherein: the power supply indicating circuit comprises an indicator lamp U $7, a protective resistor R3 and a short-circuit bonding pad JP1 which are connected in sequence, and the other end of the short-circuit bonding pad JP1 is connected with the power supply conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920939177.6U CN210573256U (en) | 2019-06-21 | 2019-06-21 | Novel atmospheric pressure detection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920939177.6U CN210573256U (en) | 2019-06-21 | 2019-06-21 | Novel atmospheric pressure detection module |
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| Publication Number | Publication Date |
|---|---|
| CN210573256U true CN210573256U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920939177.6U Active CN210573256U (en) | 2019-06-21 | 2019-06-21 | Novel atmospheric pressure detection module |
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| Country | Link |
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| CN (1) | CN210573256U (en) |
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- 2019-06-21 CN CN201920939177.6U patent/CN210573256U/en active Active
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