c3RE is the hackerspace in the Recklinghausen district (northern Ruhr area, NRW, Germany).

Sustainability projects:

• Development of an open source heat pump (together with B7 e.V.)
• Photovoltaics on & around our houses
• We cook regularly our dinner
• Environmental sensors with LoRaWAN
• Gas meter logging with reed contact or magnetometer
• Make power consumption transparent using IR or Modbus communication
• Reuse & repair

Other interesting c3RE projects:

• cocktail robot https://hectorbot.de/de/
• Mate-bottle display https://pads.c3re.de/matedisplay#
• MarQueTT[ino] https://github.com/c3re/MarQueTT
• Word Clock https://github.com/Kater--S/Kater-s-Word-Clock
• Nerd.re https://nerd.re -> jitsi https://meet.nerd.re
• home automation with Tasmota & nodeRed
• Button machine
• Cutting plotter
• Amateur radio
• Analog gaming day