Arduino Make Your UNO Kit

Arduino® UNO R4 WiFi

SOLVED: When we need to read voltages greater than 5 Volts using Arduino Uno, we can use the circuit below. Pick a suitable value for R1, if RZ = 1K ohm. The voltage to be measured is 40 Volts (max). Valoge lok Kguuted R D 1 8 1

Arduino Relay Control Tutorial

Interfacing Relay with Arduino Uno

relay module interfacing with arduino code and circuit diagam