Tag Archives: voltmeter

ICL7107 Digital Voltmeter

The circuit given here is of digital voltmeter with LED 7-segment display using the ICL7107. It measures voltage from 0.00V to 99.9V. ICL7107 is a 3 1/2 digit A/D converters with LED 7-Segment Driver.

The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive; the ICL7107 will directly drive an instrument size light emitting diode (LED) display. Continue reading ICL7107 Digital Voltmeter

Digital Voltmeter using Arduino


            7-segment displays are most popular in panel meters, It can show direct numerical value on display, It’s cost is low and display size bigger than LCD’s. Lets interface four digit display, most of the time four digits are enough to display data. Continue reading Digital Voltmeter using Arduino

LED Bar-graph Display


LED bar-graph displays are much popular in battery level indication, water level indicator applications. Most of the inverter units have LED bar-graph display on its front panel. As we have seen in previous application we used only one LED to indicate battery level. With reference to above application we are showing voltage level on LED bar-graph display. Continue reading LED Bar-graph Display

AC Voltage Measurement using Arduino

AC voltage measurement can be carried out by converting AC voltage into proportional DC Voltage using rectifier and filter circuits. For low AC voltage (mili volts) measurement precision rectifier is used as diode knee voltage is 0.7 Volt. Similar to DC voltage measurement Voltage divider is constructed using 47K Ohm variable resistor R1. 5V zener diode is used to protect Arduino from accidental excess voltages. Adjust the resistor R1 (47K) to calibrate the voltage. Here the AC voltage that we can give to transformer is from 50V to 230V depending on its ratings. Rectified DC is fed to the voltage divider circuit. Continue reading AC Voltage Measurement using Arduino

DC Voltage Measurement using Arduino


Voltage, also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field. It is measured in Volts.

What you will learn?

1. How to measure DC voltage?
2. How to make DC voltmeter using Arduino?
3. Milivolt measurement technique
4. How to calculate voltage divider circuit resistors?

Continue reading DC Voltage Measurement using Arduino