Project 22: Voltmeter - Keyestudio ARDUINO maker learning kit Manual

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Project 22: Voltmeter

Introduction
Today, let's learn how to use Arduino serial communication and analog ports. We have introduced
serial ports before. It can measure voltage 0-5V, and return corresponding 0-1023 value. Today, we
will use Arduino analog to make a 0-5V voltmeter.
Note: in this experiment, there is no complex protective circuit. So please do not use more that 2
cells of AA batteries. Besides, do not use it to measure lithium battery or other power supply!
Hardware required
Controller board *1
1KΩ resistor *1
USB cable *1
Breadboard *1
Breadboard jumper wires * several
Circuit connection
Connection for R3:
Connection for 2560 R3:
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