SCT-013 sensor adapter
Signal Conditioning Interface for SCT-013 Current Transformers
This content will be shared across all product pages.
Essential interface module designed to connect SCT-013 current transformers to microcontrollers like ESP32. This adapter provides complete signal conditioning circuit with precision voltage divider and filtering, converting the transformer's AC output to a microcontroller-friendly 0-3.3V signal. Engineered for seamless integration with RBgrid SDK and RBgrid App.
Connection Guide: https://www.rbgrid.io/application-hardware-connection
Technical Specifications
Electrical Characteristics:
- Input: 3.5mm stereo jack socket for SCT-013
- Supply voltage: 3.3V DC
- Output signal: 0-3.3V (centered at 1.65V)
Connection to ESP32:
Adapter Pin → ESP32 Pin ----------- ---------- GND → GND VCC → 3.3V SIG → GPIO32/33/34/35/36/39 (ADC1 pins)
Circuit Functionality
Signal Path:
- AC Input - CT secondary current/voltage via 3.5mm jack
- Voltage Divider - Creates 1.65V DC bias point
- AC Coupling - Superimposes AC signal on DC bias
- Filtering - Capacitor smooths high-frequency noise
- Output - Clean 0-3.3V signal for ADC reading
Technical Advantages
- Plug-and-Play - No external components needed
- Optimized Signal - Clean, stable output for accurate readings
- Safe Operation - Protected inputs prevent damage
- Wide Compatibility - Works with all SCT-013 models
- Precision Components - Ensures measurement accuracy
- Low Noise - Filtered output for stable readings