Digital Ohmmeter project using pic16f877A

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Digital Ohmmeter :

Digital ohmmeter using pic microcontroller is designed in this project. Digital ohmmeter is used to measure resistance of any resistance or any circuit. It can measure resistance between 0-1MΩ with precision of ±5  percent. 

 PIC16F877A microcontroller is used in this project to measure resistance by doing signal conditioning of measured resistance. LCD is used to display resistance value.

Circuit diagram of digital ohmmeter using pic microcontroller is given below. As shown in figure below, resistance R1 is pulled with 5 volt source and resistance whose value we want to measure is connect with ground and other terminal of resistance R1. Voltage divider concept is used to measure resistance value. LCD is used to display resistance value.
Digital Volt meter Tutorial + Code 

Figure : Digital Ohmmeter project using pic16f877A

 Working :

In above circuit diagram resistance R1 is used to as pull up resistor. Resistance R1 is connected to 5 volt source. The resistance whose value we want to measure is connected with resistance R1 to form a voltage divider. I have already discussed in Digital volt meter about how to measure voltage using pic microcontroller. I also used voltage divider in digital voltmeter article to design digital voltmeter. Same concept is used in this article. you should also know about LCD interfacing with pic microcontroller. If you don’t know about voltage measurement and LCD interfacing, I recommend you to read following articles first.

Example Code :

Figure 2: Example code




Downloads:



Digital Ohmmeter code using PIC16F877A was compiled in MPLAB X IDE v3.05 with XC8 V1.34 compiler and simulation was made in Proteus v7.10. To download code and Proteus simulation click here.

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