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Single Phase AC Voltage Sensor Module - ZMPT101B

SKU: KJ6RXV3K84
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The Single Phase AC Voltage Sensor Module – ZMPT101B is an isolated analog voltage sensing module designed for measuring and monitoring single-phase AC voltage in energy monitoring, power measurement, automation, and microcontroller-based projects. The module is built around the ZMPT101B precision voltage transformer and commonly includes an LM358-based signal-conditioning circuit to provide a proportional analog waveform suitable for ADC measurement....
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The Single Phase AC Voltage Sensor Module – ZMPT101B is an isolated analog voltage sensing module designed for measuring and monitoring single-phase AC voltage in energy monitoring, power measurement, automation, and microcontroller-based projects. The module is built around the ZMPT101B precision voltage transformer and commonly includes an LM358-based signal-conditioning circuit to provide a proportional analog waveform suitable for ADC measurement.

The module uses a miniature voltage transformer to provide galvanic isolation between the high-voltage AC input and the low-voltage signal-processing side. The isolated AC signal is amplified and biased by the onboard circuitry, producing an analog waveform centered around approximately half of the module supply voltage. This allows a microcontroller ADC to sample both positive and negative portions of the original AC waveform as a unipolar voltage signal.

An onboard multi-turn potentiometer allows the output signal amplitude to be adjusted according to the input voltage and ADC range. Common module versions are used for measuring AC voltages up to approximately 250V RMS at 50Hz or 60Hz, making them suitable for mains voltage monitoring and energy-metering projects.

The module can be interfaced with Arduino, ESP32, STM32, Raspberry Pi Pico, RP2040, PIC, AVR, and other controllers with suitable analog input capability. Proper calibration in software is required to convert sampled ADC values into accurate RMS voltage measurements.

Key Features

  • Designed for single-phase AC voltage measurement
  • Based on the ZMPT101B precision voltage transformer
  • Galvanically isolated voltage sensing
  • Measures AC voltage up to approximately 250V RMS on common modules
  • Suitable for 50Hz and 60Hz AC systems
  • Provides proportional analog waveform output
  • Onboard LM358-based signal conditioning on common versions
  • Adjustable output amplitude
  • Multi-turn calibration potentiometer
  • Output waveform biased around half the supply voltage
  • Compact PCB module design
  • Power status LED on common versions
  • High transformer accuracy and good consistency
  • Suitable for RMS voltage calculation
  • Easy connection to microcontroller ADC inputs
  • Suitable for energy monitoring and power measurement projects
  • Useful for overvoltage and undervoltage monitoring systems

Shipping & Returns

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Specifications

Specifications:

Module Type: Single-Phase AC Voltage Sensor Module
Sensor Transformer: ZMPT101B
Measurement Type: AC Voltage
Sensing Principle: Isolated Voltage Transformer
Input Voltage Range: Up to Approximately 250V AC RMS on Common Modules
Input Frequency: 50Hz to 60Hz
Module Supply Voltage: Commonly 5V DC; some board variants are specified for wider supply ranges up to 30V DC
Output Type: Analog AC Waveform with DC Bias
Output Adjustment: Multi-Turn Potentiometer
Output Center Voltage: Approximately VCC / 2
Signal Conditioning IC: LM358 on Common Module Versions
Transformer Rated Input Current: 2mA
Transformer Rated Output Current: 2mA
Transformer Turns Ratio: 1000:1000
Transformer Accuracy Class: 0.2
Transformer Linearity: Approximately 0.1%
Transformer Phase Angle Error: ≤20 Minutes under specified conditions
Transformer Isolation Withstand Voltage: Up to 4000V according to commonly published transformer specifications
Analog Interface: Single Analog Output
Typical Module Dimensions: Approximately 49.5mm × 19.4mm
Power Indicator: LED on Common Module Versions
Calibration Requirement: Software and Hardware Calibration Recommended
Compatibility: Arduino UNO, Nano, Mega, ESP32, STM32, Raspberry Pi Pico, RP2040, PIC, AVR and other ADC-equipped controllers.

Additional Resources

Voltage Sensor Module.PDF

FAQ

1. What is the ZMPT101B AC Voltage Sensor Module used for?

The ZMPT101B module is used for measuring and monitoring single-phase AC voltage. It is commonly used in digital voltmeters, energy meters, smart power monitoring systems, overvoltage protection, undervoltage detection, and IoT energy-monitoring projects.

2. Can the ZMPT101B module measure 230V AC mains voltage?

Yes. Common ZMPT101B modules are designed for measuring AC input voltages up to approximately 250V RMS, making them suitable for monitoring nominal 220V to 240V AC systems when correctly installed and calibrated.

3. Is the ZMPT101B compatible with Arduino and ESP32?

Yes. The module provides an analog waveform output that can be sampled by Arduino, ESP32, STM32, Raspberry Pi Pico, RP2040, PIC, AVR, and other controllers with a suitable ADC input.

4. Does the ZMPT101B provide electrical isolation?

Yes. The ZMPT101B transformer provides galvanic isolation between the AC measurement side and the low-voltage signal side. However, the mains input terminals remain hazardous and must be properly insulated and enclosed.

5. Does the ZMPT101B require calibration?

Yes. The onboard potentiometer adjusts the output waveform amplitude, while software calibration is used to convert ADC samples into accurate RMS voltage values. Calibration should be performed using a trusted reference meter and a stable AC source.