Arduino Current Meter, Voltage Meter Circuit. DIY Multimeter

How to make current and voltage meter with Arduino Nano.
How to measure current with Arduino.
How to measure voltage with arduino.
How to measure watt with gauge.

Voltage measurement: 7-24V
Max. current measurement : 20A

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Circuit diagram and code: http://bit.ly/39zTyIZ

Arduino Nano: https://www.banggood.com/custlink/3KG...
0.96 inc Oled Screen : https://www.banggood.com/custlink/D3m...

Necessary Materials:
Arduino Nano
0.96 inc Oled
ACS714 20A Current Sensor
5x5 cm PCB Board
UF4007 Diode
R1 Resistor 10K
R2 Resistor 1.5K
78M05 Regulator
0.1uF Capacitor
0.33uF Capacitor