Supported Targets	ESP32	ESP32-C2	ESP32-C3	ESP32-C6	ESP32-H2	ESP32-S2	ESP32-S3
	✓	?	?	?	?	?	?

ESP-IDF Opentherm

This component provides an implementation of Opentherm protocol with ESP-IDF. Tested on ESP-IDF > 5 version.

How to Use Example

Before project configuration and build, be sure to set the correct chip target using idf.py set-target <chip_name>.

Hardware Required

• A development board (e.g., ESP32-S3-DevKitC, ESP32-C6-DevKitC etc.)
• A USB cable for Power supply and programming
• An opentherm adapter

See Development Boards for more information about it.

Configure the Project

Open the project configuration menu (idf.py menuconfig).

In the OpenTherm Configuration menu:

• Select GPIO in pin
• Select GPIO out pin

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

I (9369) OT: ====== OPENTHERM =====
I (9369) OT: Free heap size before: 293684
I (9369) OT: Central Heating: OFF
I (9369) OT: Hot Water: OFF
I (9369) OT: Flame: OFF
I (9379) OT: Fault: NO
I (9659) OT: Set CH Temp to: 60
I (9929) OT: Set DHW Temp to: 59
I (10199) OT: DHW Temp: 0.0
I (10469) OT: CH Temp: 44.3
I (10739) OT: Slave OT Version: 0.0
I (11009) OT: Slave Version: C07FA308
I (11279) OT: Slave OT Version: 3.0
I (11279) OT: Free heap size after: 293684
I (11279) OT: ====== OPENTHERM =====

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.