In this post we are going to construct a simple digital ohmmeter circuit using Arduino and 16x2 LCD display. We will also be exploring the other possible circuit ideas using the same concept. By: Girish Radhakrishnan The motto of this article is not just making an ohm meter to measure the resistance; your multimeter can better do the same. The main objective of this project is to use the resistance value read by arduino to do some useful projects, for instance, fire alarm, where the change in resistance value of thermistor can be easily detected or automatic irrigation system where, if the resistance of soil goes high the microcontroller can trigger the water pump. The possibility of projects is up to your imagination. Let’s see how to make an ohm meter first and then we move to other circuit ideas. The circuit: The circuit consists of Arduino; you may use your favorite Arduino board, a 16x2 LCD display to showcase the unknown resistor value, a potentiometer to adjust contra...