Temperature logging for household composting system. Conditions inside composter is measured with a small device containing Olimex MSP430-CCRF card, which has a small MSP430 microcontroller and radio transmitter. Device runs with three 1.5 V lithium batteries.

The composter looks like this, it is a standard Biolan model.

The microcontroller card looks like this:

Sensor log:

  • Batteries have been installed 19.3.2012

  • Batteries have been replaced 14.11.2012. Replaced also sensor board because one capacitor was damaged by water that somehow got into case.
  • Batteries replaced 4.2.2014. Sensor board replaced with new one as old one started suddenly sucking more current than expected.
  • Batteries replaced 12.1.2017.