Voltage & Zero-Cross sensor
Module for precise AC voltage measurement with zero-cross detection.
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Specialized measurement module designed to work with the RBgrid SDK and RBgrid App. Combines a precision voltage sensor based on ZMPT107-1 transformer and high-speed Zero-Cross detector, ensuring accurate measurement synchronization with mains frequency.
Connection Guide: https://www.rbgrid.io/application-hardware-connection
Key Specifications
Measurement Section:
- Current transformer: ZMPT107-1 (2mA/2mA)
- Measurement range: 0-250V AC
- Accuracy: ±0.5%
- Output signal: 0-3.3V (centered at 1.65V)
Zero-Cross Detector:
- Circuit: Diode bridge + PC817 optocoupler
- Response time: <100 µs
- Output signal: Digital 3.3V (active low)
- Trigger frequency: 100/120 Hz (at 50/60 Hz mains)
General Parameters:
- Supply voltage: 3.3V DC
- Current consumption: <20 mA
- Isolation: 4000V RMS
- Operating temperature: -20°C...+70°C
Design Features
- Trimmer potentiometer for precise measurement range adjustment
- Factory calibration - module ready to use out of the box
- Galvanic isolation for safe operation with high voltage
- Compact form factor 46.5×18.5×20 mm
- Low power consumption - mains current <0.5 mA
Connection
Power Section (AC):
- Terminal block for AC mains connection (L-N)
- Recommended wire gauge: AWG-26 or higher
- Built-in overvoltage protection
Microcontroller Interface:
- GND - Common ground
- VCC - Module power supply (3.3V)
- VOUT - Analog output of voltage sensor
- ZC - Digital output of zero-cross detector
Software Integration
Configuration via RBgrid Web App:
- Open the Sensors page in the web interface
- The section of ZC and Voltage as default.
Configuration via RBgrid SDK:
The SDK documentaion for hardware.
Technical Advantages
- High accuracy thanks to precision ZMPT107-1 transformer
- Stable measurements through synchronization with mains frequency via ZC
- Safety - complete galvanic isolation from high voltage
- Plug & Play - pre-calibrated at factory
- Compatibility - optimized for ESP32 and RBgrid Web App and RBgrid SDK
Package Contents
- AC Voltage Sensor + ZC Detector module
- Connection wires (4 pcs)
- Technical documentation