This is the first binary release since 0.2.1!

Information on features will be published here - please refer to #26 in the meantime!

Improved Data Logger

Per log cycle, the data logger now logs the following values:

• Lowest temperature
• Highest temperature
• Heating duty cycle DC = 100% (t.on/(t.on + t.off)
• Number of relay trip cycles

The console command L.dump produces 144 lines with the following values each:

These values get packed into 32bits for efficient storage in the EEPROM.

L.dump produces lists with 144 lines. The latest entry is last in the list.

\ % #  min  max
\ - - ---- ----
 58 3 36.1 37.9
 66 3 36.0 37.9
 58 3 36.1 37.9
 65 3 36.1 37.9
 66 3 36.1 37.9
 58 4 36.3 37.9
 60 3 36.2 37.9
 61 4 36.2 37.9
 52 3 36.2 38.2
 53 4 36.3 38.0
 55 3 36.3 38.0
 53 4 36.3 38.0

These numbers can be fed into a spread sheet, e.g. for creating diagrams

Improved Sensor Filtering

measure.fs now applies a second low pass filter on the linearized output. Rounding of values has also been improved.

Other Changes

• General code clean-up, improved identifiers and comments,
• re-ordering the high-level words in task revealed a bug in the DEFAULT path (it was still safe). #15 "Sensor error leads to unbalanced stack in control.fs" fixes this.

Please use the latest binary!

Improved Data Logger

Per log cycle, the data logger now logs the following values:

• Lowest temperature
• Highest temperature
• Heating duty cycle DC = 100% (t.on/(t.on + t.off)
• Number of relay trip cycles

The console command L.dump produces 144 lines with the following values each:

These values get packed into 32bits for efficient storage in the EEPROM.

L.dump produces lists with 144 lines. The latest line is last in the list.

\ % #  min  max
\ - - ---- ----
 58 3 36.1 37.9
 66 3 36.0 37.9
 58 3 36.1 37.9
 65 3 36.1 37.9
 66 3 36.1 37.9
 58 4 36.3 37.9
 60 3 36.2 37.9
 61 4 36.2 37.9
 52 3 36.2 38.2
 53 4 36.3 38.0
 55 3 36.3 38.0
 53 4 36.3 38.0

These numbers can be fed into a spread sheet, e.g. for creating diagrams

Improved Sensor Filtering

measure.fs now applies a second low pass filter on the linearized output. Rounding of values has also been improved.

Other Changes

General code clean-up, improved identifiers, and comments,

This release uses STM8 eForth to turn a $1.50 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 interval, and a 288 entry ring-buffer
• logger access through 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!