“The device is sufficiently accurate and uses minimum number of external components.
This is a simple auto-ranging ohmmeter using Arduino. The measured resistance is displayed using a 16×2 LCD display. The device is sufficiently accurate and uses minimum number of external components. Easy way to measure an unknown resistance is to use a voltage divider. You apply a known voltage across two series resistors, one known, one unknown, and measure the voltage at the junction. The current through two resistors will be equal.The voltage across the unknown resistance is measured using the ADC of the arduino(A5). With Ohm’s law we can easy calculate value of unknown resistor.”