To get better UV expose, Andrianakis has built new Switch Timer that will turn of his UV exposure box after some time. The timer uses ATmega8 as main processor and two 7-segments LED as display. There are two buttons for set and start the timer. When time runs out, microcontroller switches relay and also sounds a buzzer.
The time is calculated by timer interrupt triggering using a 32.768 KHz RTC Crystal with better accuracy. The firmware is written in C and you can compile it using WinAVR.
For more detail: AVR Switch Timer using ATmega8 Microcontroller
This free embedded project also found using:
- 7 segment timer bascom
- timer relay using avr
- Avr project relay timer with atmega8 with 7 segmen
- timera avr
- avr timer relay