esp-idf/examples/peripherals/rmt/ir_protocols/README.md
2019-11-20 10:54:21 +08:00

73 lines
3.0 KiB
Markdown
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

# IR Protocol Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
This example illustrates how to encode and decode RMT signals with/to common IR protocols (e.g. NEC and RC5).
[NEC](https://www.sbprojects.net/knowledge/ir/nec.php) and [RC5](https://www.sbprojects.net/knowledge/ir/rc5.php) have different encoding rules, but both can be compatible to RMT data format.
The example supports building and parsing both normal and extended NEC/RC5 protocol. And also supports `repeat code` which would be sent out if one remote key got pressed for a specific long time.
## How to Use Example
### Hardware Required
* A development board with ESP32 SoC (e.g. ESP32-DevKitC or ESP-WROVER-KIT)
* 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.
Example connection :
| ESP32 | IR333C | IRM-3638T |
| -------- | ------ | --------- |
| GPIO18 | Tx | × |
| GPIO19 | × | Rx |
| VCC 5V | √ | × |
| VCC 3.3V | × | √ |
| GND | GND | GND |
### Configure the Project
Open the project configuration menu (`idf.py menuconfig`).
In the `Example Connection Configuration` menu:
* Select the infrared protocol used in the example under `Infrared Protocol` option.
* Set the GPIO number used for transmitting the IR signal under `RMT TX GPIO` option.
* Set the GPIO number used for receiving the demodulated IR signal under `RMT RX GPIO` option.
### 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 will see the following output log (for NEC protocol):
```
I (2000) example: Send command 0x20 to address 0x10
I (2070) example: Scan Code --- addr: 0x0010 cmd: 0x0020
I (2220) example: Scan Code (repeat) --- addr: 0x0010 cmd: 0x0020
I (4240) example: Send command 0x21 to address 0x10
I (4310) example: Scan Code --- addr: 0x0010 cmd: 0x0021
I (4460) example: Scan Code (repeat) --- addr: 0x0010 cmd: 0x0021
I (6480) example: Send command 0x22 to address 0x10
I (6550) example: Scan Code --- addr: 0x0010 cmd: 0x0022
I (6700) example: Scan Code (repeat) --- addr: 0x0010 cmd: 0x0022
I (8720) example: Send command 0x23 to address 0x10
I (8790) example: Scan Code --- addr: 0x0010 cmd: 0x0023
I (8940) example: Scan Code (repeat) --- addr: 0x0010 cmd: 0x0023
I (10960) example: Send command 0x24 to address 0x10
I (11030) example: Scan Code --- addr: 0x0010 cmd: 0x0024
I (11180) example: Scan Code (repeat) --- addr: 0x0010 cmd: 0x0024
```
## 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.