Voltage & Zero-Cross sensor

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:

1. Open the Sensors page in the web interface
2. 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