A far-infrared communication circuit with hardware transceiver self-control function

Abstract

The invention discloses a far infrared communication circuit with a hardware transceiving self-control function. The far infrared communication circuit comprises a 38K carrier generation circuit, a signal coupling circuit, an infrared signal transmission circuit, an infrared signal receiving circuit and a transceiving self-control circuit, wherein the input end of the signal coupling circuit is connected with a transmit data (TXD) signal line, and the output end of the signal coupling circuit is electrically connected with the 38K carrier generation circuit and the transceiving self-control circuit respectively; the 38K carrier generation circuit is electrically connected with the infrared signal transmission circuit; the output end of the infrared signal receiving circuit is connected with a receive data (RXD) signal line, and the input end of the infrared signal receiving circuit is connected with the transceiving self-control circuit; the signal coupling circuit consists of a second resistor R2, a third diode D3 and NOT gate units U1B and U1C; the NOT gate unit U1C is further connected with another TXD signal line. The far infrared communication circuit does not need to be additionally controlled and does not need a carrier signal, and the infrared data is directly transmitted and received by transistor-transistor logic (TTL) level; the circuit is simple and reliable, and has high cost performance and universality.

Description

[0001] The present invention is based on the divisional application of the Chinese patent No. 201210407261.6 filed on October 23, 2012, entitled "A Far Infrared Communication Circuit with Hardware Transceiver and Self-Control Function". Part of the content of this application specification is quoted way incorporated into this article. technical field [0002] The invention mainly relates to a far-infrared meter reading communication circuit applied among electric meters, computers and handheld devices. Background technique [0003] Far-infrared communication is widely used in wireless meter reading applications of handheld devices and computers and electric meters. Because the signal transmitted by far infrared is modulated with 38K carrier, and the transmission power is large, the receiving end will receive the infrared signal transmitted by itself synchronously during transmission, which will cause data congestion, so it is necessary to add a single-chip microcomputer to g...

AI Technical Summary

Problems solved by technology

Because the signal transmitted by far infrared is modulated with 38K carrier, and the transmission power is large, the receiving end will receive the infrared signal transmitted by itself synchronously during transmission, which will cause data congestion, so it is necessary to add a single-chip microcomputer to generate 38K carrier and send and receive judgment control, increase The cost and software workload are reduced, and the transceiver control is judged by the single-chip software to reduce the system reliability.

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