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This little device has an awful lot of features
Often used for precision 3D printers and CNC machines
3 V to 5 V
Onboard relay LED indicator
DC Voltage Sensor Module l7915 This little device has anIntroduction : Voltage Detection Sensor Module 25V module is based on the principle of resistive voltage divider design, it can make the red terminal connector input voltage to 5 times smaller. Arduino analog input voltages up to 5 v. The voltage detection module input voltage not greater than 5Vx5=25V (if using 3. 3V systems, input voltage not greater than 3. 3Vx5=16. 5V). It has the limit of Arduino analog input 5 VDC only. So if you wish to measure