Monitor for radioactive radiation based on STS-6 (CTC-6) Geiger tube. Sensitive to gamma and hard beta. Transmission every 60 seconds. Dose rate is estimated from pulse rate with fixed factor. Normal level is just below 0.1 µS/h.
Gamma events are detected by a Teviso radiation sensor. Events are accumulated in 10 minute intervals. A NeoPixel changes color with the radiation level detected. The GEM is supported by a WeMos D1 board running microPython.