mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
111 lines
4.0 KiB
Markdown
111 lines
4.0 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
|
|
# IR NEC Encoding and Decoding Example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
[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.
|
|
|
|
## How to Use Example
|
|
|
|
### Hardware Required
|
|
|
|
* A development board with supported SoC mentioned in the above `Supported Targets` table
|
|
* An USB cable for power supply and programming
|
|
* A 5mm infrared LED (e.g. IR333C) used to transmit encoded IR signals
|
|
* An infrared receiver module (e.g. IRM-3638T), which integrates a demodulator and AGC circuit
|
|
|
|
### Hardware Connection
|
|
|
|
```
|
|
IR Receiver (IRM-3638T) ESP Board IR Transmitter (IR333C)
|
|
+--------------------------+ +----------------------+ +---------------------------+
|
|
| RX+-------+IR_RX_GPIO IR_TX_GPIO+--------------+TX |
|
|
| | | | | |
|
|
| 3V3+-------+3V3 5V+--------------+VCC |
|
|
| | | | | |
|
|
| GND+-------+GND GND+--------------+GND |
|
|
+--------------------------+ +----------------------+ +---------------------------+
|
|
```
|
|
|
|
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`.
|
|
|
|
### Build and Flash
|
|
|
|
Run `idf.py -p PORT flash monitor` to build, flash and monitor the project.
|
|
|
|
(To exit the serial monitor, type ``Ctrl-]``.)
|
|
|
|
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.
|
|
|
|
## Example Output
|
|
|
|
Run this example, you might see the following output log:
|
|
|
|
```
|
|
...
|
|
I (0) cpu_start: Starting scheduler on APP CPU.
|
|
I (306) example: create RMT RX channel
|
|
I (306) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
|
|
I (316) example: register RX done callback
|
|
I (316) example: create RMT TX channel
|
|
I (326) gpio: GPIO[18]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
|
|
I (336) example: modulate carrier to TX channel
|
|
I (336) example: install IR NEC encoder
|
|
I (346) example: start RMT TX and RX channel
|
|
|
|
NEC frame start---
|
|
{0:9020},{1:4461}
|
|
{0:577},{1:577}
|
|
{0:577},{1:576}
|
|
{0:552},{1:601}
|
|
{0:552},{1:601}
|
|
{0:577},{1:576}
|
|
{0:578},{1:575}
|
|
{0:583},{1:572}
|
|
{0:579},{1:574}
|
|
{0:576},{1:1648}
|
|
{0:553},{1:1673}
|
|
{0:579},{1:1647}
|
|
{0:580},{1:1645}
|
|
{0:577},{1:1649}
|
|
{0:554},{1:1673}
|
|
{0:578},{1:1648}
|
|
{0:553},{1:1673}
|
|
{0:555},{1:1671}
|
|
{0:578},{1:577}
|
|
{0:553},{1:1673}
|
|
{0:554},{1:1671}
|
|
{0:555},{1:601}
|
|
{0:580},{1:574}
|
|
{0:551},{1:603}
|
|
{0:580},{1:574}
|
|
{0:553},{1:601}
|
|
{0:553},{1:1672}
|
|
{0:554},{1:602}
|
|
{0:552},{1:603}
|
|
{0:579},{1:1646}
|
|
{0:554},{1:1672}
|
|
{0:555},{1:1672}
|
|
{0:580},{1:1646}
|
|
{0:555},{1:0}
|
|
---NEC frame end: Address=FF00, Command=F20D
|
|
|
|
NEC frame start---
|
|
{0:9024},{1:2213}
|
|
{0:583},{1:0}
|
|
---NEC frame end: Address=FF00, Command=F20D, repeat
|
|
|
|
NEC frame start---
|
|
{0:584},{1:0}
|
|
---NEC frame end: Unknown NEC frame
|
|
|
|
...
|
|
```
|
|
|
|
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).
|
|
|
|
## Troubleshooting
|
|
|
|
For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
|