Although it’s an amazing DIY project, we noted that most of the readers are looking for more advanced circuits using multiple seven-segment light emitting diode displays. Here is a simple, yet useful ...

2) Display information to LCDs controlled by your Arduino. 3) Be programmed to act as an extensive combination lock 4) Offer commands, such as ENTER, LOAD, CLEAR, etc.

4-Channel DVM With Display And Keypad Oct. 8, 2008 This circuit uses Microchip’s PIC16C71, an 8-bit microcontroller, to create a digital voltmeter with an LED display and a keypad.