DIY Autorange Arduino Ohmmeter

This is a simple auto ranging ohmmeter using arduino.
The measured resistance is displayed using a 162 LCD display.
The circuit is sufficiently accurate and uses minimum number of external components possible.
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 arduinoA5 .
With Ohms law we can easy calculate value of unknown resistor.
The idea for the project as well as the code are taken from the circuitstoday website where there are more detailed explanations about the operation and mathematical calculations. What we need here is a scheme for estimating the value of Rx roughly and then putting a matching resistor in place of R1 and this method is called auto ranging. The accuracy of the instrument is the largest in the range from 10 Ohm to 100 KOhms and is about - 5 which is a good result considering that the device is relatively simple to build.
It is desirable to supply the instrument from a stable source for maximum accuracy. Instructions schematic and code at: Visit my Youtube Channel for more Projects DIY and How To Make videos: by mircemk SUBSCRIBE LIKE AND SHARE !!!! Thanks for your Support ! Song: Jarico - Landscape Vlog No Copyright Music Music promoted by Vlog No Copyright Music. Video Link: NoCopyrightMusic VlogMusic VlogNoCopyrightMusic

Источник: rutube.ru