This post is about building a simple 0-5V 3 digit voltmeter using Arduino UNO compatible board and 4×20 LCD display. This design should also work on all similar boards, I’ve tested it on Arduino Mega and UNO boards. No additional components are required. The Arduino sketch for this project may look different from what you … Read more
Here is another version of Arduino based voltmeter. This time it uses 4-digit 7-Segment LED display and MAX7219 Display Driver. For similar design with 2×16 LCD display click this link. Also you can look at PIC16F876 implementation in my previous post. Interfacing the MAX7219 was covered in this article. You can see in the Arduino … Read more
MAX7219 is a serial input/output common-cathode display driver. It can interface the microcontroller to 7-segment numeric LED displays, bar-graph displays, dot matrix display or individual LEDs. This IC has some very useful features like built in decoder, multiplex scan circuitry, segment and digit drivers, and on-chip memory to stores each digit value. Only one external … Read more