Arduino Voltmeter With OLED Display
An Arduino Voltmeter with an OLED display
This first step is to place the OLED board on the breadboard. Then connect pin 13 to CLK, pin 11 to DIN, pin 9 to CS, pin 8 to D/C and pin 7 to RES.
Pins: 13, 11, 9 are the SPI Bus of the Arduino UNO board.
Then plug the resistors on the breadboard and connect them for each other, the other side of the 100k resistor connect to ground, the connection between both of them to analog 0 and the other side of the 10k resistor to the source you wish to measure