“Hello everyone, I hope you are doing great! In this instructable I am going to show you how I made this Power meter/ Wattmeter module for use with an Arduino board. This power meter can calculate the power consumed by and DC Load. Along with power, this module can also give us accurate readings of voltage and current. It can easily measure low voltages (around 2V) and low currents, as low as 50 mA with an error not more than 20mA. The accuracy depends upon the choice of components based upon your requirements.
Supplies:
- IC LM358 dual OP-AMP
- 8 pin IC base
- Shunt resistor(8.6 milliOhms in my case)
- Resistors: 100K, 10K, 2.2K, 1K (1/2watt)
- Capacitors: 3 * 0.1uF ceramic capacitors
- Veroboard or zero board
- Screw terminals
- Soldering iron and solder
- Arduino Uno or any other compatible board
- OLED Display
- Connecting breadbard wires”