The ZMPT101B AC Voltage Sensor Module is a compact sensing module designed for accurate measurement of single-phase AC voltage in embedded and monitoring systems. It uses a precision ZMPT101B miniature voltage transformer with an onboard operational amplifier circuit for stable signal conditioning and accurate analog output. The module supports voltage measurement up to 250V AC and features an adjustable calibration potentiometer for fine tuning. Its high galvanic isolation and wide operating voltage range make it suitable for microcontroller platforms such as Arduino, ESP8266, and Raspberry Pi. Ideal for energy monitoring systems, smart meters, and electrical measurement projects.