digital multimeter using 8051

Posted on Feb 5, 2014

Build a digital multimeter that can measure dc/ac voltages up to 100V and dc/ac currents up to 1A. The circuit will be powered by 9v battery. I have decided to use the voltmeter from and modify it according to my needs. The problem is that after implementing the circuit, I only get half the value shown on the lcd (10v input, 5v on lcd)[SOLVED: I was suppose to connect to vcc not Vref/2]

digital multimeter using 8051
Click here to download the full size of the above Circuit.

What could be the reason for this thank you @Experimenteruk everything works perfectly. Now I have to add a rectifier so I can measure AC voltage and current. I am going to post the finished project when it`s all done. Hi, I`m new here. I want to modifie the digital voltmeter project into a multimeter to measure 0-100 V AC and DC and 0-1 A. How can I modifie the c code to display on the LCD AC, DC, A, V

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