This is the code that you can copy-paste. We then want to display the results on the LCD screen. We just want to collect the analog signal that the Arduino receives at Pin A5 (or any other analog pin) and convert it to digital. We’re now done with the electronics/hardware. Then put a wire in the GND and another in an analog pin, like A5. Connect Pins 4, 6, 11, 12, 13, and 14 of the LCD to any digital pin on Arduino (for example, Pin 2). Let’s connect the LCD to the Arduino so that we can display the voltage (which we will collect from an analog pin) on the LCD. Plug in your Arduino to test and see if the LCD turns on! The LCD lights up! Step 3 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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