An LED watch with the heart of an analog. The always on hands sweep through the time just like a classic wristwatch. Via ar.bin on Hackaday:
The current through the LEDs, and therefore the brightness, is regulated by the centrally positioned LDR to ensure good readability even in bright sunlight.
A tilt switch which reduces, when the watch is placed horizontally, the voltage after 12 minutes by shutting down the LT3459 boost converter, so the LEDs no longer light up to save energy. The watch is powered by a Li-Ion button cell with 3.7 V / 74 mAh, which only needs to be charged after approx. 20 days with a daily wearing time of 10 hours. This is achieved by an average current consumption of approx. 0.15 mA. The Attiny1614 microcontroller is generally in deep sleep and is woken up every second for 1.4 ms by an interrupt from the real-time clock DS3231 in order to control the LEDs via the 10 shift-and-store registers HEF4094. After 20 ms, it is briefly woken up again by a timer interrupt to switch off the second LEDs. The watch is set by touch capacitively instead mechanical switch.
See even more from droplet watch
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