The project started as a timer for my PCB exposure box.
However since it almost look like a clock when i was designing it i added some clock features and the AVR Clock + Timer + (maybe i will add a temperature sensor was born).
It is split in two or if you add the power part 3 PCB
4 Common Anode Seven Segments multiplexed
IDC 14 connector to the main board
ICP 6 pins for the In system programming
IDC 14 connector to the Display Board
DS1307 with the CR2032 coin battery
3 Button for the operation
Mode is selected between
Timer Set (with the Minutes UP, Seconds UP)
Timer Ready (start with the Minutes UP, stop with the Second Up)
1×32768 Hz Crystal
4xSeven Segment displays CA
Code on github