ZMPT101B AC Voltage Sensor Module, Single-Phase, up to 250V

Measuring AC mains voltage safely and accurately calls for proper isolation between the high-voltage circuit being measured and the low-voltage electronics doing the measuring - the ZMPT101B handles exactly that isolation through a dedicated precision voltage transformer, stepping the mains-level voltage down to a safe, measurable signal without directly exposing sensitive microcontroller circuitry to mains voltage.

Measurement range covers single-phase AC voltage up to 250V, suiting standard household and small-equipment mains voltage monitoring directly. An onboard precision operational amplifier circuit conditions the transformer's output into a clean, usable analog signal, with the output level adjustable to match whatever input range a connected microcontroller's ADC expects - a genuinely useful flexibility point rather than being locked to one fixed output scaling.

The module itself runs on a separate low-voltage supply (5V to 30V), completely isolated from the mains voltage being measured on the transformer side, maintaining the safety separation that matters when any part of a project interacts with household AC voltage. Compact PCB dimensions (49.5 x 19.4mm) keep the module easy to integrate into a larger project enclosure.

Builders working on an AC voltage monitoring project, a DIY energy meter, a mains-voltage logging system, or any application needing to safely measure household AC voltage levels through proper transformer isolation will find the ZMPT101B a well-proven, purpose-built sensor for that specific measurement task.