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Nowadays Voltmeters are commonly using devices like in the digital voltmeter or multi meter or solar panel  power monitoring system anyway do you know how it is working here I'm trying  to understanding that how it is working Here I'm creating an Arduino based voltmeter so we need to understand Arduino a little bit before getting into that take a look at this Arduino example program called ReadAnalogVoltage our base program is this, by modifying the program and the hardware we can measure a wide range of voltages. ANALOG PIN & ITS THEORY First, we have to take a look at the Arduino pins here we are using the Analog pins  to measure the voltage and it is a 10 bit ADC (Analog to Digital Converter)  so it can chop or sampling  the input signal = Input signal / 2 10   but Arduino can only handle the voltage 0 to up to +5V if the voltage exceeds it will probably burn the entire Arduino or  the pins so be careful with this voltage, so if we take the maxi