New update on github
http://github.com/ChrisV77/TelescopeDewHeaterController
It has a few more options
- ambient temperature/humidity - can use either DHT22 or AM2320 (change in wiring)
- display: 16x2 LCD or 128x64 OLED (no change to wiring)
Also
- improved some odd behaviour due to interference between DS18B20 sensor and heater output if wires run close to each other
- has a switch to change mode
- optional output to computer and simple control via arduino serial monitor (I'll be making a windows app for this soon)