Arduino Resistance Measurement

Definition

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. It is measured in Ohms.

What you will learn?

  1. How to use arduino to measure resistance?
  2. How to apply simple ohms law?
  3. What are the different methods of resistance measurement?

Measurement of resistance (50 Ohm to 500K)

Measurement of resistance is again from V=I x R,  R = I / V or using voltage divider circuit.

  I = Vout / 1K
VRx = 5 – Vout
Rx = Vrx / I
Rx = (5 – Vout) / I
Where:
Rx = Resistance to be measured
VRx = Voltage Across Rx
I = Current flowing through voltage divider
Vout = Voltage measured by ADC

Resistance Measurement Circuit

Arduino Resistance Measurement Circuit
Arduino Resistance Measurement Circuit

Resistance Measurement Arduino Code

Result of Resistance Measurement

Open the serial terminal and see the resistance value, in this experiment I found that if you remove zero from 5.0 and make it 5 or 1024.0 to 1024 the code will not work.

Result Resistance Measurement
Result Resistance Measurement

This circuit is suitable for higher values of resistance only to measure lower value resistance Low Value Resistance Measurement circuit is use.

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