I2C clock using HT16K33 and ATtiny

Setup

1. Recreate a circuit in Tinkercad
2. Use the following schema
3. Paste the code from clock.c

Using the clock

Use button to set the time, long press makes it increment quicker. After setting the time, it will increment automatically every minute.

Note that in Tinkercad simulation it may take longer than one minute to increment!!