Indoor temperature and humidity meter, displaying daily averages, history graph and dew point. Code is hardly optimized to fit in 4k and run on Atmega48. Can be powered with 3 AA batteries (draws ~1 mA)
Required hardware:
- DHT-11
- LCD 1602 (without backlight if you want it to run on batteries)
- Atmega48 or better configured to run on 8 MHz internal oscillator
- ~50mF 16V capacitor
- 10k resistor
- potentiometer for LCD contrast
- Arduino ISP to flash the Atmega (or another flasher)
LCD connections might be not up-to-date. Check vs code comments