ESP32 Controller for Charlton & Jenrick Fireplace

This project uses an ESP32-WROOM-32 and a CC1101 433 MHz transceiver to control a fireplace using a captured 2-FSK RF payload.
It integrates with Home Assistant via MQTT and also exposes a simple web interface with ON/OFF buttons.

Information

I have only tested this on my own fireplace which is an i1800e, but all of the following ranges below should work as well, but they have not been tested.

Fireplace	Tested	Working
i750e	false	unknown
i1000e	false	unknown
i1250e	false	unknown
i1500e	false	unknown
i1800e	true	Yes
i2200e	false	unknown

I plan to add reverse engineer more button features with the aim to evtually map the full controller, when time permits.

Hardware

• ESP32-WROOM-32 dev board (e.g. ESP32 DevKit)
• CC1101 433 MHz module
• 3.3 V power (CC1101 must not be powered from 5 V)

Note: This has only been test with an ESP32-WROOM-32, but it is more than likely other ESP32 board will work as well, or need just some minor configuration changes to work. Pull requests are welcome.

Wiring

CC1101 pin	ESP32 pin	Notes
VCC	3V3	3.3 V only
GND	GND	Common ground
CSN (CS)	GPIO5	Chip select
SCK	GPIO18	SPI SCK
SO (MISO)	GPIO19	SPI MISO
SI (MOSI)	GPIO23	SPI MOSI
GDO0	GPIO21	Used by library
GDO2	—	Not connected

Software

• PlatformIO
• Framework: Arduino (ESP32)
• Libraries:
  • mfurga/cc1101 – CC1101 driver
  • knolleary/PubSubClient – MQTT client

platformio.ini

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

lib_deps =
  mfurga/cc1101@^1.2.0
  knolleary/PubSubClient@^2.8

MQTT & Homeassistant

Mqtt is supported out of the box should work with Homeassistant seamlessly. Simply edit the main.cpp file and provide your mqtt user/pass details as well as your broker information. Should you have Mqtt auto discovery on the device will be added automatically in your HA. If not you may need to add it manually.

Build & Install

Connect your ESP32-WROOM-32 dev board and run the following command:

platformio run -e esp32dev --target upload

Once the upload is complete, you can run the following to see the serial output from your module:

pio device monitor -b 115200

Usage

Once an IP has been assigned, you can go view and interact with the controller from the web UI, simply visit the IP assigned on port 80 -> ${ASSIGNED_IP}:80

Contributing

LSP Config

I use clangd as my LSP. To get it to be aware of platformio libs you need to feed it PlatformIO’s compile flags & include paths. Run the following:

pio run -t compiledb

This should create a file called compile_commands.json in the root of the project.

Secrets

Rename secrets-sample.h in src/ folder to secrets.h and add the needed information for wifi/mqtt.

Contributors

A massive thanks to @cthuwu_chan who helped me decode the signal originally. 🙇