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111 lines
4.0 KiB
Markdown
111 lines
4.0 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
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# IR NEC Encoding and Decoding Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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[NEC](https://www.sbprojects.net/knowledge/ir/nec.php) is a common use IR protocol, this example creates a TX channel and sends out the IR NEC signals periodically. The signal is modulated with a 38KHz carrier. The example also creates an RX channel, to receive and parse the IR NEC signals into scan codes.
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## How to Use Example
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### Hardware Required
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* A development board with supported SoC mentioned in the above `Supported Targets` table
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* An USB cable for power supply and programming
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* A 5mm infrared LED (e.g. IR333C) used to transmit encoded IR signals
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* An infrared receiver module (e.g. IRM-3638T), which integrates a demodulator and AGC circuit
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### Hardware Connection
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```
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IR Receiver (IRM-3638T) ESP Board IR Transmitter (IR333C)
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+--------------------------+ +----------------------+ +---------------------------+
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| RX+-------+IR_RX_GPIO IR_TX_GPIO+--------------+TX |
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| | | | | |
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| 3V3+-------+3V3 5V+--------------+VCC |
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| | | | | |
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| GND+-------+GND GND+--------------+GND |
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+--------------------------+ +----------------------+ +---------------------------+
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```
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The TX and RX GPIO number used by this example can be changed in [the source file](main/ir_nec_transceiver_main.c) via `EXAMPLE_IR_TX_GPIO_NUM` and `EXAMPLE_IR_RX_GPIO_NUM`.
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### Build and Flash
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Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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Run this example, you might see the following output log:
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```
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...
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I (0) cpu_start: Starting scheduler on APP CPU.
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I (306) example: create RMT RX channel
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I (306) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (316) example: register RX done callback
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I (316) example: create RMT TX channel
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I (326) gpio: GPIO[18]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (336) example: modulate carrier to TX channel
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I (336) example: install IR NEC encoder
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I (346) example: start RMT TX and RX channel
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NEC frame start---
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{0:9020},{1:4461}
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{0:577},{1:577}
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{0:577},{1:576}
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{0:552},{1:601}
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{0:552},{1:601}
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{0:577},{1:576}
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{0:578},{1:575}
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{0:583},{1:572}
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{0:579},{1:574}
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{0:576},{1:1648}
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{0:553},{1:1673}
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{0:579},{1:1647}
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{0:580},{1:1645}
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{0:577},{1:1649}
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{0:554},{1:1673}
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{0:578},{1:1648}
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{0:553},{1:1673}
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{0:555},{1:1671}
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{0:578},{1:577}
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{0:553},{1:1673}
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{0:554},{1:1671}
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{0:555},{1:601}
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{0:580},{1:574}
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{0:551},{1:603}
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{0:580},{1:574}
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{0:553},{1:601}
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{0:553},{1:1672}
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{0:554},{1:602}
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{0:552},{1:603}
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{0:579},{1:1646}
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{0:554},{1:1672}
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{0:555},{1:1672}
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{0:580},{1:1646}
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{0:555},{1:0}
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---NEC frame end: Address=FF00, Command=F20D
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NEC frame start---
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{0:9024},{1:2213}
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{0:583},{1:0}
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---NEC frame end: Address=FF00, Command=F20D, repeat
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NEC frame start---
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{0:584},{1:0}
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---NEC frame end: Unknown NEC frame
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...
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```
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In the example's main loop, the RX channel waits for any NEC frames, if nothing received within 1 second, the TX channel will send out a predefined NEC frame (address=0x0440, command=0x3003).
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## Troubleshooting
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For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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