1c92945f59
Currently, several example dependencies rely on the fact that all registered components are added to the build, along with components specified in common requirements. This results in longer build times because even unused components must be built. Switch all examples to use idf_minimal_build to compile only the components actually required by the example. Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-H2 | ESP32-P4 | 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 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 Targetstable - 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 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 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.