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Updated main examples README to add missing examples folders and Getting Started links Updated wifi/fastscan example README Updated wifi examples README Updated wifi main examples README Added instructions and removed obviousness from examples README Updates on example README in peripherals, system and wifi Updates on example README in peripherals and added wave form pictures on wave_gen example Updates and review on example README Revision on unit style convention Added the getting started link for each supported version Readme review and recommended enhancements Added the default note on the wave form option info Added the ESP32-C3 support information on the temperature sensor example README Added Getting Started information for ESP32-S2 and ESP32-C3 Issue fixed on the supported target on README Resolved merge conflict |
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| main | ||
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| README.md | ||
| example_test.py | ||
| sdkconfig.ci.nec | ||
| sdkconfig.ci.rc5 | ||
README.md
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 and RC5 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 Configuration menu:
- Select the infrared protocol used in the example under
Infrared Protocoloption. - Set the GPIO number used for transmitting the IR signal under
RMT TX GPIOoption. - Set the GPIO number used for receiving the demodulated IR signal under
RMT RX GPIOoption.
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 for all the steps to configure and use the ESP-IDF to build projects.
- ESP-IDF Getting Started Guide on ESP32
- ESP-IDF Getting Started Guide on ESP32-S2
- ESP-IDF Getting Started Guide on ESP32-C3
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.