Let’s Build an Arduino Ohmmeter

This gadget tests the resistance of electrical components. Place the unknown resistor you want to test in series with the reference resistor R1 connected to GND. The Arduino will calculate the resistance and display it on the Serial Monitor. The resistance of other electrical objects can be measured with the Arduino Ohmmeter as well. Building the Arduino Ohmmeter on a MakerShield protoboard makes the device small enough to carry to a friend’s house to check his electronic projects. Figure 13-2 shows the Fritzing diagram for the Arduino Ohmmeter.

Figure 13-2. An Arduino Ohmmeter Fritzing diagram