This module can be used to test the current and voltage. The principle of voltage test based on the principle of resistive voltage divider design can make the red terminal connector input voltage to 5 times smaller for 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). For Arduino AVR chips have 10-bit AD, so this module simulates a resolution of 0.00489V (5V/1023), so the minimum voltage of the input voltage detection module is 0.00489Vx5=0.02445V. The MAX471 chip on the board used to test the consumed current of the load Pin Configuration: VT: voltage detection pin, the detected voltage is 1/5 of the input voltage AT: Current Detection Pin GND: Connect to Arduino GND VOUT/VIN: VOUT=VIN Features: Measure the voltage and current in the circuit. Adopts the MAX471 chip, the module directly uses the detected power supply. The minimum voltage input detected by this module is 3V. Package Includes: 1 x Current and Voltage Detection Module Arduino Compatible. SKU: PGI-00396910 Category: Current and Voltage Sensor