There is finally the the first (pre-) release of the W1209 $1.50 data logging thermostat!

It's based on the latest STM8 eForth (pre-release 2.2.20.pre.1), and the binary was automatically built in uCsim, and deployed, by Travis-CI.

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 interval, and a 288 entry ring-buffer
• logger access through a serial console
• fully programmable in Forth, even while the thermostat is running!

Although it's feature-complete, it's work in progress.

For the future, the following feature are planned:

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