WS2812 matchbox clock

Clock in matchbox size with touch control

Binary clock, it has 16 pieces WS2812B matrix display showing binary coded time.

Touching the top, the Arduino gets a wake up interrupt from a TTP223 touch sensor, wakes from sleep, reads the time keeping chip PCF8563 and displays the time on WS2812 chain. Waits 2 sec, turns off the WS2812 supply and goes back to sleep mode to save the battery. In this mode, the consumption is about 30 uA, it means that the battery is good for 20000 working hours (many years theoretically) with a single charge.

The color of the WS2812 is freely adjustable in the Arduino program, the default is red for the 1, yellow for 2, green 4, blue 8 binary weight. To read the time, you add the weights vertically.

When the charger is connected, the display stays on. Holding your finger on top keeps the display on, gradually increasing the intensity to maximum.

Display: The matrix of 16 WS2812B LEDs in series is available on Aliexpress. Connect 3 wires, Gnd,