Arduino voltage measurement with Zener divider

An Arduino measures 24V DC battery UPS voltage using a voltage divider and Zener diode. The circuit shifts the 20-30V range to 0-5V for accurate ADC reading. Linear regression validates the voltage mapping.

https://www.hal9k.dk/measuring-high-dc-supply-voltage-with-an-arduino/

#arduino #voltage #divider #zener