This is a timing device which I’ve made for a symposium in our university.
![The Product on the symposium table.](https://www.endtas.com/wp-content/uploads/2012/12/symposium-timer1-300x225.jpg)
You adjust the time in the splash screen then press and hold SAY (Count) and it counts up to the adjusted time.
![](https://www.endtas.com/wp-content/uploads/2021/05/timer-short.gif)
The timer will announce the last minutes of the time by led effects and speech.
Read more for the circuit schematic, source code and the proteus simulation file