CN215646797U - Far infrared communication processing circuit for gas meter - Google Patents
Far infrared communication processing circuit for gas meter Download PDFInfo
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- CN215646797U CN215646797U CN202121687028.9U CN202121687028U CN215646797U CN 215646797 U CN215646797 U CN 215646797U CN 202121687028 U CN202121687028 U CN 202121687028U CN 215646797 U CN215646797 U CN 215646797U
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- far infrared
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- infrared communication
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Abstract
The utility model discloses a far infrared communication processing circuit of a gas meter, which comprises a far infrared communication transmitting circuit and a far infrared communication receiving circuit; the far infrared communication transmitting circuit comprises a first PNP tube, a second current limiting resistor, a first pull-up resistor, a third current limiting resistor, a second PNP tube, a second pull-up resistor, a fourth current limiting resistor, an NPN tube and a far infrared transmitting tube; the far infrared communication receiving circuit comprises a far infrared receiving tube, a first current limiting resistor and a first filter capacitor. The circuit has strong anti-interference capability, longer communication distance and wide bevel angle, and the bevel angle distance reaches 90 degrees when the communication distance is 1 meter through tests; when the communication distance is 3 meters, the bevel angle distance is 15 degrees. Under normal conditions, when infrared communication is not needed, the output pin POW of the MCU can be lowered, the far infrared communication processing circuit is closed, and the power consumption of the whole machine is reduced.
Description
Technical Field
The utility model belongs to the field of gas intelligent instruments, and relates to a far infrared communication processing circuit. The function is realized by three triodes, six resistors and a pair of infrared receiving and transmitting tubes.
Background
In the field of gas instruments, when the parameters of the instruments are to be set or modified after the instruments are assembled and subjected to sealing treatment, the instruments are very inconvenient, and the parameters are very effective to read and write by using infrared communication under the condition. However, the communication distance of the currently used infrared communication circuit is about 3-4cm, and communication failure is easily caused by an overlarge bevel angle. The utility model relates to a far infrared communication processing circuit which can carry out long-distance communication and can well solve the problem.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a far infrared communication processing circuit of a gas meter.
A far infrared communication processing circuit of a gas meter comprises a far infrared communication transmitting circuit and a far infrared communication receiving circuit; the far infrared communication transmitting circuit comprises a first PNP tube Q1, a second current limiting resistor R1, a first pull-up resistor R2, a third current limiting resistor R3, a second PNP tube Q2, a second pull-up resistor R4, a fourth current limiting resistor R5, an NPN tube Q3 and a far infrared transmitting tube D1; the far infrared communication receiving circuit comprises a far infrared receiving tube U1, a first current limiting resistor R6 and a first filter capacitor C1.
In the far infrared communication transmitting circuit, the collector terminal of a first PNP tube Q1 is connected with 3.3V voltage, the base of the first PNP tube Q1 is connected with one end of a second current limiting resistor R1, the other end of the second current limiting resistor R1 is connected with a control pin CTL of an MCU, the emitter of the first PNP tube Q1 is connected with one end of a first pull-up resistor R2, the other end of the first pull-up resistor R2 is connected with one end of a third current limiting resistor R3 and the base of the second PNP tube Q2, the other end of the third current limiting resistor R3 is connected with a sending pin TXD of the NPN MCU, the collector terminal of the second PNP tube Q2 is connected with an output pin POW of the MCU, the emitter terminal of the second PNP tube Q2 is connected with one end of the second pull-up resistor R4, the other end of the second pull-up resistor R4 is connected with the cathode of the far infrared transmitting tube D1, the anode of the far infrared transmitting tube D1 is connected with the collector terminal of the Q3, the base of the PWM 3 is connected with the base of the MCU, the emitter of the NPN transistor Q3 is connected to GND.
An OUT pin of a far infrared receiving tube U1 in the far infrared communication receiving circuit is connected with one end of a first current limiting resistor R6, the other end of the first current limiting resistor R6 is connected with a receiving pin RXD of an MCU, a GND pin of the far infrared receiving tube U1 is connected with GND, a VCC pin of the far infrared receiving tube U1 is connected with an output pin POW of the MCU and one end of a first filter capacitor C1, and the other end of the first filter capacitor C1 is connected with GND.
The utility model has the following advantages:
the utility model provides a far infrared communication processing circuit, which has strong anti-jamming capability, longer communication distance and wide bevel angle, and the bevel angle distance reaches 90 degrees when the communication distance is 1 meter through testing; when the communication distance is 3 meters, the bevel angle distance is 15 degrees.
Under normal conditions, when infrared communication is not needed, the output pin POW of the MCU can be lowered, the far infrared communication processing circuit is closed, and the power consumption of the whole machine is reduced.
Drawings
Fig. 1 is a far infrared communication processing circuit provided by the present invention.
Detailed Description
In order to explain technical contents, structural features, and effects of the present invention in detail, the following detailed description is made with reference to the accompanying drawings in conjunction with the embodiments.
As shown in fig. 1, a far infrared communication processing circuit of a gas meter comprises a far infrared communication transmitting circuit and a receiving circuit; the transmitting circuit comprises a first PNP tube Q1, a second current-limiting resistor R1, a first pull-up resistor R2, a third current-limiting resistor R3, a second PNP tube Q2, a second pull-up resistor R4, a fourth current-limiting resistor R5, an NPN tube Q3 and a far infrared transmitting tube D1; the receiving circuit comprises a far infrared receiving tube U1, a first current limiting resistor R6 and a first filter capacitor C1.
In the far infrared communication transmitting circuit, the collector terminal of a first PNP tube Q1 is connected with 3.3V voltage, the base of the first PNP tube Q1 is connected with one end of a second current limiting resistor R1, the other end of the second current limiting resistor R1 is connected with a control pin CTL of an MCU, the emitter of the first PNP tube Q1 is connected with one end of a first pull-up resistor R2, the other end of the first pull-up resistor R2 is connected with one end of a third current limiting resistor R3 and the base of the second PNP tube Q2, the other end of the third current limiting resistor R3 is connected with a sending pin TXD of the NPN MCU, the collector terminal of the second PNP tube Q2 is connected with an output pin POW of the MCU, the emitter terminal of the second PNP tube Q2 is connected with one end of the second pull-up resistor R4, the other end of the second pull-up resistor R4 is connected with the cathode of the far infrared transmitting tube D1, the anode of the far infrared transmitting tube D1 is connected with the collector terminal of the Q3, the base of the PWM 3 is connected with the base of the MCU, the emitter of the NPN transistor Q3 is connected to GND.
An OUT pin of a far infrared receiving tube U1 in the far infrared communication receiving circuit is connected with one end of a first current limiting resistor R6, the other end of the first current limiting resistor R6 is connected with a receiving pin RXD of an MCU, a GND pin of the far infrared receiving tube U1 is connected with GND, a VCC pin of the far infrared receiving tube U1 is connected with an output pin POW of the MCU and one end of a first filter capacitor C1, and the other end of the first filter capacitor C1 is connected with GND.
The circuit of the utility model works as follows:
the circuit starts to work, the control pin CTL is pulled down, the first PNP tube Q1 is opened, the pin POW outputs high level to supply power to the far infrared communication transmitting and receiving circuit, the pin TXD carries out high and low signal change, and when the TXD sends high level, the second PNP tube Q2 is cut off; when the TXD sends low level, the second PNP tube Q2 is opened, current flows to the far infrared transmitting tube D1, pulse width modulation is carried out by using the control pin PWM, when high level is output, the NPN tube Q3 is opened, the far infrared transmitting tube D1 is conducted, and infrared carrier signals are transmitted. When the pin POW outputs a high level, the far infrared communication receiving circuit starts to work, the pin RXD starts to be at a high level, and when the far infrared receiving tube U1 receives an infrared carrier signal of the far infrared transmitting tube, the OUT pin of the far infrared receiving tube U1 outputs a low level to indicate that the infrared carrier signal is received, so that the far infrared communication is completed. When the infrared communication is not used, the pin POW is pulled down, so that the power consumption of the main control board is reduced.
Claims (1)
1. A far infrared communication processing circuit of a gas meter is characterized by comprising a far infrared communication transmitting circuit and a far infrared communication receiving circuit; the far infrared communication transmitting circuit comprises a first PNP tube Q1, a second current limiting resistor R1, a first pull-up resistor R2, a third current limiting resistor R3, a second PNP tube Q2, a second pull-up resistor R4, a fourth current limiting resistor R5, an NPN tube Q3 and a far infrared transmitting tube D1; the far infrared communication receiving circuit comprises a far infrared receiving tube U1, a first current limiting resistor R6 and a first filter capacitor C1;
in the far infrared communication transmitting circuit, the collector terminal of a first PNP tube Q1 is connected with 3.3V voltage, the base of the first PNP tube Q1 is connected with one end of a second current limiting resistor R1, the other end of the second current limiting resistor R1 is connected with a control pin CTL of an MCU, the emitter of the first PNP tube Q1 is connected with one end of a first pull-up resistor R2, the other end of the first pull-up resistor R2 is connected with one end of a third current limiting resistor R3 and the base of the second PNP tube Q2, the other end of the third current limiting resistor R3 is connected with a sending pin TXD of the NPN MCU, the collector terminal of the second PNP tube Q2 is connected with an output pin POW of the MCU, the emitter terminal of the second PNP tube Q2 is connected with one end of the second pull-up resistor R4, the other end of the second pull-up resistor R4 is connected with the cathode of the far infrared transmitting tube D1, the anode of the far infrared transmitting tube D1 is connected with the collector terminal of the Q3, the base of the PWM 3 is connected with the base of the MCU, an emitter of the NPN tube Q3 is connected with GND;
an OUT pin of a far infrared receiving tube U1 in the far infrared communication receiving circuit is connected with one end of a first current limiting resistor R6, the other end of the first current limiting resistor R6 is connected with a receiving pin RXD of an MCU, a GND pin of the far infrared receiving tube U1 is connected with GND, a VCC pin of the far infrared receiving tube U1 is connected with an output pin POW of the MCU and one end of a first filter capacitor C1, and the other end of the first filter capacitor C1 is connected with GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121687028.9U CN215646797U (en) | 2021-07-23 | 2021-07-23 | Far infrared communication processing circuit for gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121687028.9U CN215646797U (en) | 2021-07-23 | 2021-07-23 | Far infrared communication processing circuit for gas meter |
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| CN215646797U true CN215646797U (en) | 2022-01-25 |
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| CN202121687028.9U Active CN215646797U (en) | 2021-07-23 | 2021-07-23 | Far infrared communication processing circuit for gas meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114745050A (en) * | 2022-03-08 | 2022-07-12 | 浙江威星智能仪表股份有限公司 | Long data processing method based on far infrared data transmission system |
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2021
- 2021-07-23 CN CN202121687028.9U patent/CN215646797U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114745050A (en) * | 2022-03-08 | 2022-07-12 | 浙江威星智能仪表股份有限公司 | Long data processing method based on far infrared data transmission system |
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