Analog Arduino Shows Voltage Drop Voltmeter Doesn39t Electrical - electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals students and enthusiasts span class news dt 14 07 2015 span nbsp 0183 32 hello i wanted to measure the voltage across the resistor connected in series with the emitter see the attachment though an external voltmeter was reading the voltage correctly when changing the duty cycle however the a0 pin wasn t read analog voltage this ex le shows you how to read an analog input on analog pin 0 convert the values from analogread into voltage and print it out to the serial monitor of the arduino hey scott this is incredibly helpful i ve been struggling with measuring voltage with the arduino for a while and i note that different boards and different batteries lead to really different results on all my analog if you need to read in a voltage on an arduino digital or analog input.

pin ensure it is between 0 and 5v if it is outside these limits you can bring down the voltage using a voltage divider this scales the input voltage to allow for analog or digital readings of voltages otherwise outside the allowed range it s easy to make a simple digital voltmeter using an arduino and 16x2 liquid crystal display lcd it s relatively simple to use an arduino to measure voltages the arduino has several analog input pins that connect to an analog to digital converter adc inside the arduino the arduino itself can measure both positive 2 5v and negative 2 5v if you pull the analog reference voltage to half the supply voltage use a pair of matched 4 7k resistors and bypass the pin with 47 mfd to 5 and 47 mfd to ground





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