CN202798730U - 38KHz modulation infrared transmitting and receiving device - Google Patents
38KHz modulation infrared transmitting and receiving device Download PDFInfo
- Publication number
- CN202798730U CN202798730U CN2012203042341U CN201220304234U CN202798730U CN 202798730 U CN202798730 U CN 202798730U CN 2012203042341 U CN2012203042341 U CN 2012203042341U CN 201220304234 U CN201220304234 U CN 201220304234U CN 202798730 U CN202798730 U CN 202798730U
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- 38khz
- infrared
- infrared transmitting
- tube
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Abstract
The utility model discloses a 38KHz modulation infrared transmitting and receiving device, comprising a CPU (Central Processing Unit), an infrared receiving tube, and an infrared transmitting tube; wherein the infrared receiving tube is connected with a receiving end of the CPU through a diode, the infrared transmitting tube is connected with a transmitting end of the CPU through a triode Q2, a 38KHz pulse generated by the CPU is connected with the infrared transmitting tube through a triode Q1; the triode Q1 is an NPN junction triode, and the triode Q2 is a PNP junction triode. The 38KHz modulation infrared transmitting and receiving device of the utility model adopts a pulse width modulation output (PWM controller) of the CPU to generate a 38KHz square-wave pulse, then controls on-off of the triode by using the pulse to control transmitting of the infrared transmitting tube, thus the 38KHz modulation infrared transmitting and receiving device can effectively generate the pulse modulation with a 38KHz carrier frequency, thereby completing infrared modulation and transmitting.
Description
Technical field:
The utility model relates to a kind of infrared sending and receiving device, particularly relates to the outer sending and receiving device of a kind of 38KHz modulated red.
Background technology:
At present, the infrared reception of 38KHz and transtation mission circuit have multiple, the timer internal generation 38KHz pulse of useful CPU, also useful outer logic circuit and electric capacity produce concussion, thereby the pulse of production 38KHz.But for first method, mainly be relatively to waste the timer resource, programming and control are got up and also very bothered, and is portable poor; And second method is higher to the electric capacity required precision that produces concussion, otherwise the pulse that is difficult to guarantee to produce 38KHz ± 1KHz, so more loaded down with trivial details when producing and debugging, need to test one by one and detect, so the method wastes time and energy.
The utility model content:
Technical problem to be solved in the utility model is: overcome the deficiencies in the prior art, provide the 38KHz modulated red that a kind of circuit is simple, debugging is convenient, practicality is high outer sending and receiving device.
The technical solution of the utility model is:
The outer sending and receiving device of a kind of 38KHz modulated red, contain processor, infrared receiving tube and infrared transmitting tube, described infrared receiving tube is connected with the receiving terminal of described processor by diode, described infrared transmitting tube is connected with the transmitting terminal of described processor by triode Q2, and the 38KHz pulse that described processor produces is connected with described infrared transmitting tube by triode Q1.
Described triode Q1 is NPN knot triode, and described triode Q2 is the positive-negative-positive triode.
[0005]The beneficial effects of the utility model are:
1, the utility model adopts the pulse-width modulation output (PWM controller) of CPU to produce the square-wave pulse of 38KHz, control again the emission of infrared transmitting tube with the break-make of this pulse control triode, can effectively produce carrier frequency is the 38KHz pulse modulation, sends thereby finish infrared modulation.
2, the utility model circuit is simple, debugging is convenient, practicality is high, and it is applied widely, is easy to promotion and implementation, has good economic benefit.
Description of drawings:
Fig. 1 is the logical construction block diagram of the outer sending and receiving device of 38KHz modulated red;
Fig. 2 is the circuit theory diagrams of the outer sending and receiving device of 38KHz modulated red shown in Figure 1.
Embodiment:
Embodiment: referring to Fig. 1 and Fig. 2, among the figure, 1-processor, 2-infrared receiving tube, 3-infrared transmitting tube.
The outer sending and receiving device of 38KHz modulated red is mainly by infrared sending tube 3 and infrared receiver tube 2, the pulse input of the 38KHz that is produced by the PWM of ppu 1 in addition, the triode Q1 of the triode Q2 of a positive-negative-positive and a NPN knot, and current-limiting resistance and power filtering capacitor formation, infrared receiver tube 2 is connected with the UART_RXD receiving terminal of the UART of CPU by diode D6, is used for receiving infrared data.And the UART_TXD transmitting terminal of the UART of CPU sends out the break-make that the serial data of Transistor-Transistor Logic level is controlled triode Q1, because PWM is produced by the square wave of 38KHz always, when UART_TXD is low level, triode Q2 is in conducting state, infrared transmitting tube 3 is controlled with regard to the pulse that PWM output is arranged so, infrared transmitting tube 3 will send out the infrared pulse signal of 38KHz like this, what namely send is the low level signal after the modulation, when UART_TXD is high level triode Q2 cut-off, infrared transmitting tube 3 can not form the loop, can not conducting, infrared transmitting tube 3 just can not send out the infrared pulse signal of 38KHz, namely think the high level signal after the modulation that is that sends, infrared transmitting tube 3 will send the infrared signal of 38KHz pulse modulation like this, thereby realizes infrared communication.
Claims (2)
1. the outer sending and receiving device of a 38KHz modulated red, contain processor, infrared receiving tube and infrared transmitting tube, it is characterized in that: described infrared receiving tube is connected with the receiving terminal of described processor by diode, described infrared transmitting tube is connected with the transmitting terminal of described processor by triode Q2, and the 38KHz pulse that described processor produces is connected with described infrared transmitting tube by triode Q1.
2. the outer sending and receiving device of 38KHz modulated red according to claim 1, it is characterized in that: described triode Q1 is NPN knot triode, and described triode Q2 is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203042341U CN202798730U (en) | 2012-06-27 | 2012-06-27 | 38KHz modulation infrared transmitting and receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203042341U CN202798730U (en) | 2012-06-27 | 2012-06-27 | 38KHz modulation infrared transmitting and receiving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798730U true CN202798730U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203042341U Expired - Fee Related CN202798730U (en) | 2012-06-27 | 2012-06-27 | 38KHz modulation infrared transmitting and receiving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202798730U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355470A (en) * | 2021-12-21 | 2022-04-15 | 厦门阳光恩耐照明有限公司 | Anti-interference active infrared induction circuit |
| CN115171255A (en) * | 2022-06-27 | 2022-10-11 | 北京睿家科技有限公司 | Access control system based on infrared detection |
-
2012
- 2012-06-27 CN CN2012203042341U patent/CN202798730U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355470A (en) * | 2021-12-21 | 2022-04-15 | 厦门阳光恩耐照明有限公司 | Anti-interference active infrared induction circuit |
| CN115171255A (en) * | 2022-06-27 | 2022-10-11 | 北京睿家科技有限公司 | Access control system based on infrared detection |
| CN115171255B (en) * | 2022-06-27 | 2024-05-10 | 北京睿家科技有限公司 | Access control system based on infrared detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20180627 |