1/7/2024 0 Comments Arduino dc battery monitorSo, i chose R1 = 16 KOhms and R2 = 22 KOhms which gives an output voltage of 4.863 V at maximum voltage input from battery. I could consider buying the SMD component but i don't know if it's easy to build the circuit myself? There is also another method of using an external voltage reference. Is this worth a try? Will it give significantly better precision? When i measured with the digital voltmeter, there was a small discrepancy, so i discovered another solution while searching but it uses a breakout board which has precision resistors. Is there another way to make this resistive voltage divider setup better or more accurate? I read about using internal precision reference but i wonder if it will be the same since the UNO is powered by the same DC voltage source.Īlso, from what i understand, this sketch is using the UNO’s power supply voltage as a reference or maybe not since the following line is used: float ref_voltage = 5.0 Shouldn't it be this instead, since the ADC reads from 0 to a maximum value of 1023? adc_voltage = (adc_value * ref_voltage) / 1023.0 Print results to Serial Monitor to 2 decimal placesīut i have a doubt about the correctness of this line since i found this formula online: adc_voltage = (adc_value * ref_voltage) / 1024.0 Floats for resistor values in divider (in ohms)Īdc_voltage = (adc_value * ref_voltage) / 1024.0 Floats for ADC voltage & Input voltage This is my current approach which is to use a resistive voltage divider which i built using two commonly available THT resistors: // Define analog input I have come across a few methods during my research, but i want to avoid buying breakout boards, since i would rather make it as DIY as possible. I want to measure the DC voltage supplied to my Arduino UNO R3 setup, by using the Arduino itself to find the most accurate voltage reading.
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