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.

10 Wp solar panel, two 3400 mAh Li-CoO2 18650 batteries in parallel, permanent small ~50 mW load. A shunt regulator limits battery voltage to 4.1 V. An externally powered ESP32 measures sol and bat powers for ThingSpeak.

Showing the values of an ARDUINO MEGA based thermometer with ESP8266 WLAN interface