This is an ESP8266 firmware to add Wifi abilities to your STC1000 thermostat.
- Flash your STC1000 with STC1000+ COM firmware
- Connect the STC1000 to a ESP8266 board
- Flash the ESP8266 board with ESP-STC
- WiFi config: Provides a WiFi Access Point to help during the configuration phase
- OTA: Over The Air reprogrammation using Arduino OTA method
- Telnet Shell: Configure all parameters through shell and access STC1000+
- MQTT: Publish STC1000 data to an MQTT broker
You could then plug this to a grafana server for instance, in order to have supervision. We made a script to help with this.
Once you have these thermostat installed, you might want to use these tools to use them. We've made a few scripts to help :
If you want to retrieve the list of thermostats :
./scripts/list-ota.shUsing ESP8266 + STC1000 is not a straight-forward setup to make a WiFi thermostat. You could rather use relays, display and buttons directly connected to an ESP board.
We use this setup because:
- We already had STC1000 installed
- It is a really cheap setup (less than 30€)
If you consider all parts of the setup, STC1000 provides for ~15€:
- 1 x Power transformation from 220V to 5V
- 2 x 220V relays (heat and cool)
- 1 x Numeric display
- 4 x Buttons
- 1 x Temperature sensor
You then only need to add a ESP8266 board like NodeMCU for ~10€ and you get a WiFi thermostat for less than 30€ without complex electronic design and soldering.
The first step is to flash your STC1000 with the excellent STC1000+ firmware. STC1000+ comes in multiple variants and you must use the "COM" variant to enable one-wire communication on the STC1000.
Be carefull: not all STC1000 are compatible with STC1000+ firmware.
STC1000 modification are explained on the STC1000+ project.
Once your STC1000 is upgraded to STC1000+ using the single-wire COM variant, you are ready to plug the ESP8266 board to the STC1000.
We are using the NodeMCU board, but the project should work with any ESP8266 based board with few changes.
Pin attribution on NodeMCU:
| STC1000 | NodeMCU |
|---|---|
| ICSPDAT | D0 |
| ICSPCLK | Unused |
| GND | GND |
| 5V | VIN |
| mCLR | Unused |
Pin D0 is used because it provides a PULLDOWN mode and it is used directly without any pulldown resistor on the connection.
First install your Arduino environment. We use ESP Makefile to build the project, but it should work with the Arduino IDE with few changes.
Make sure you have all dependencies installed:
- xoseperez/justwifi
- marvinroger/async-mqtt-client
- fredericsureau/arduino-stc1000p
- fredericsureau/arduino-shell
Connect the NodeMCU using USB port.
make
make upload
That's it!
For OTA you can use:
OTA_ADDR=<ip_address> make ota
You can send telnet commands in batch using:
cd scripts
./telnet.sh <ip_address> commands.txt
This project is licensed under the GPLv3 License - see the LICENSE file for details
This project use a lot of great Arduino/ESP librairies, thanks!
- xoseperez/justwifi - Simple WiFi
- marvinroger/async-mqtt-client - Asynchronous MQTT client for ESP
- fredericsureau/arduino-stc1000p - Arduino communication with the STC1000+
- fredericsureau/arduino-shell - Shell for arduino