W1209 Data-Logging Thermostat

This project uses STM8EF to turn an off-the-shelf W1209 into a data logging thermostat.

Features are:

• heating thermostat, e.g. for building chicken egg incubators
• basic sensor failure detection
• parameters for set-point, hysteresis, and trip-delay
• easy to use parameters menu (no need to search for a manual!)
• temperature logger with 0.1h to 10h intervall, and a 288 entry ring-buffer
• logger access throug a serial console
• fully programmable in Forth, even while it's running!

Although it's feature-complete, this is work in progress:

• Beta-grade "bleeding edge"
• not even an "endurance run" yet

Planned features:

• Improved logger with min/max temperature, and heating duty cycle
• Field-bus feature for thermostats
• more fail-safe features (parameter integrity, maybe a buzzer)

Please check out the HACKADAY.IO project!

The GitHub releases page contains a

The Makefile provides a dependency resolution feature that downloads an STM8 eForth binary release, and adds the required folders, files, and symlinks to the base folder.

For programming the W1209 binary please follow the instructions in the STM8EF Wiki page for board W1209, or just type make flash.

Interactive scripting through the serial console is supported once the base STM8 eForth system has been flashed to the board. Please refer to the instructions for getting a serial console.

The recommended terminal emulator is e4thcom: it supports line editing, and upload of source files with #include, and using a library with #require. Just type #i main.fs to load the complete source code!

For Continuous Integration, make simload uses ucSim to create an STM8 binary file that contains the full thermostat script, including the W1209-FD base image. The Docker image tg9541/docker-sdcc contains tool dependencies for Continuous Integration (refer to .travis.yml).

• clone the repository
• install stm8flash
• connect a ST-LINK-V2 dongle to a W1209
• run make defaults to wipe the stock firmware
  • warning: there is no known public source for the stock firmware, and after erasing it there is no way back!
• run make to flash the STM8EF binary
• for interactive scripting install e4thcom
• optionally install the development version of ucSim (or use the Docker image) to take advantage of off-line image creation

The code is based on the STM8EF binary release. The Makefile automatically retrieves, and resolves the version specified by STM8EF_VER.

Please refer to the STM8EF Wiki for more information.

File an issue, post a comment in the HACKADAY.IO project, or contribute docs, code, or new use-cases and requirements.

And above all: please write about it in forums, blogs, or on Twitter (please use #W1209 and #STM8EF hashtags).