Exhibitors 2015
- DRONES
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What Tinys.it
32 LEDs in circle shows the time. The solid LED indicates the hours, while the blinking LED indicates the minutes.
The microcontroller has 32 pin, they aren't all I/O: only 25 pins can be used for the 32 LEDs and the touch sensor. To drive a larger number of LEDs with few pins i've used the Charlieplexing Matrix, in this way i can drive 6 LEDs with only 3 Pins.
The time is showed by touching the upper part of the watch.
For perfect timing i've used a 32.768 KHz Crystal connected to Xtal pins of Atmega328p running in asynchronous mode. In this way i can use internal 8Mhz oscillator as main clock of the microcontroller and the overflow of timer2 (used for the external crystal) as interrupt for increase the seconds.
Alessandro Matera
I'm a member of Dr-Jack team (www.dr-jack.it)
I live in Sortino, a little city near Siracuse