The core of the watch is an Arduino Mini. To make it good for time telling, a real-time clock module was added. A DHT11 monitors the ... and other data with an LCD from a Nokia 5110.

the EM6110 bitmap controller/driver for dot-matrix monochrome TN and STN LCD displays eliminates the need for external components associated with comparable chips. The device operates on 1.8V to 5 ...