The same project can also be implemented using Atmega328 micro-controller. ADC Resolution = Vref / (1024 -1) ADC Resolution = 1.1 V / 1023 = 1100mV / 1023 = 1.075 mVĠ-50V DC Voltmeter using Arduino and Seven Segement Display:Ġ-50V DC Voltmeter using Atemga328 and Seven Segement Display: The resistor R1and R2 forms the voltage divider which is connected to analog input pin A0 of Arduino.ġN4728 3.3 Volt Zener Diode, at the A0 pin, is used for high voltage protection for Arduino. Internal reference voltage as Vref 1.1V of Arduino is selected for measurement. The voltage divider circuit is used to divide voltage into two parts, out of which one is fed to the input analog terminal of Arduino. 4 digits, common cathode Seven Segment Display.You can learn more about 7 segment Display at Stopwatch using 4 Digit 7 Segment Display & Arduino Popular MAX7219 display driver, connected with Arduino Uno is used for displaying the measured DC voltage. The Arduino inbuilt 10 bit ADC, can be used for measuring the 0-50V. The above figure shows the 0-50V DC Voltmeter using Arduino and Seven Segment Display. Voltage beyond 50 Volt isn’t measurable by it. This DC voltmeter is linear with voltage and shows linear characteristics from 0.01 Volt to 50 Volt. This time we will be interfacing Arduino with 7 segment display and MA7219 IC to measure voltage ranging from 0-50V with almost no error at all. We are back again here with the latest Arduino Project, i.e DC Voltmeter using Arduino and Seven Segment Display. 5 0-50V DC Voltmeter using Atemga328 and Seven Segement Display:.4 0-50V DC Voltmeter using Arduino and Seven Segement Display:.