One more suggestion: if we use an Arduino PWM pin as the common anode pin, we can power on/off the display and change its brightness. If we put in the sockets four 7-segments LED common cathode LCD ...

Each display has 8 individual LEDs — 7 segments ... RAM on the Arduino. A clock wouldn’t be any good if it wasn’t accurate. A Tiny RTC supplies battery-backed time data.

In the Arduino board, digital outputs from D2 to D8 are used to drive segments (a to g), and digital outputs D9 to D12 are used for the digits (D0-D3) of the 4×7 LED display. Note that here the ...

From there, it was relatively easy to connect the dial to one of the pins on an Arduino Uno to ... [Scott-28] added a seven-segment LED display to show the current time, a couple of LEDs to ...