Today the electronic devices are widely used in this Era. So the measurement of potential difference and current is very important to know. In this work the implementation of voltmeter is carried out. The advantage of this voltmeter is that can be measure the wide range of voltage and precision is 90% efficiency. This circuit is designed to measure 0 to 230VThe new microcontroller based voltmeter cost is very cheap and can be setup easily. When we use what we have learned of microprossers and adjust the program to calculate and show the measure in the 7 segment. The software programming has been interpolated using MPLAB and PROTEUS.