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
Category Archives: Arduino
DC Voltage Measurement using Arduino
Definition
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?
Single LED as Voltage Level Indicator
Introduction
In many circuits we need to display battery voltage level, most of the battery operated device need indication for battery level such as solar lamp, charger circuits. LEDs are most popular to show status of system such as power on/off, Level indication Low, High, Medium etc. LEDs are available in various sizes and colors, they are simple to use and offer design flexibility. Let’s start with our first example LED as voltage level indications. This can be useful in battery level indication applications. Continue reading Single LED as Voltage Level Indicator