Connect Pin 1 of the LCD to a negative charge, Pin 2 to a positive charge, Pin 3 to a negative charge, Pin 5 to a negative charge, Pin 15 to a positive charge, and Pin 16 to a negative charge. Now we’ll connect the pins on the LCD to the breadboard so we can get current to it. This provides electric current to the columns on the breadboard, which we can now connect to the LCD. Then using a wire, connect one wire from the GND pin (ground state) on the Arduino to the negative charge on breadboard, and one wire from the 5V pin to the positive charge. Take a breadboard (I used a small one with 30 rows) and connect an LCD screen to it. Let’s get started! The Electric Circuit Step 1 If you’re looking for an easy project to learn electronics, then making a digital voltmeter will be fun. I used Arduino Uno (to collect voltage in analog and to power the LCD), a small LCD screen that I got in my Arduino starter kit (to display the voltage), a breadboard (to connect everything), and jumper wires. I accepted the challenge, started hacking, coding, testing, re-coding, and re-testing, and finally I had my voltmeter ready and working by dinner time! Last Sunday, while I was explaining the basics of electronics and Arduino to my roommate, she challenged me to understand how a voltmeter works and build one from scratch just using the stuff I own already. By Harshita Arora How to make a digital voltmeter using Arduino
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