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This is an arduino programmable OLED panel meter that uses the INA226 power monitor chip to sense the voltage, and current which is then shown on the SSD1306 OLED display. Usually other small panel meters which are the ones on amazon/ebay that are dirt cheap are very inaccurate, and some of them come with this potentiometer that can vary the voltage and current, but this is only accurate within a small range of values, and usually messes up the volt/current reading. To avoid this frustration I built my own panel meter that can display both voltage, and current accurately, be very tiny, be easy to use, measure watts, and change units of any measurement. All this is achieved in this Instructable.

- ATMEGA328p
- LM317 (3.3v regulator)
- INA226

- 3 x 10kΩ, 330Ω, 200Ω, 82Ω (0402 resistors)
- 1uF(1206), 4 x 0.1uF, 2 x 20pF (0402 ceramic capacitors)
- 8Mhz Crystal Oscillator
- Red LED (0805)
- 5mΩ 2W Resistor (2512)

- FTDI Programmer
- SSD1306 OLED display”

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