SparkFun Non-Invasive Current Sensor Kit

Easily monitor the power drawn by your AC devices without having to disconnect circuits, cut wires, or splice lines. The SparkFun Non-Invasive Current Sensor Kit gives you everything you need to safely measure AC energy consumption data all via I²C and the Qwiic Connect System. At the heart of this kit is the Qwiic-enabled ADE7953 single-phase multifunction metering IC from Analogue Devices, paired with a 100A to 50mA split-core current transformer for a solderless, non-invasive sensor solution.

Non-Invasive Current Metering

The ADE7953 at the heart of the Qwiic Current Sensor is a single-phase multifunction metering IC that can also measure neutral current on a second channel. It's highly accurate with less than 0.1% error in measuring both active and reactive energy over a dynamic range of 3000:1. It also provides an instantaneous IRMS measurement with less than 0.2% error. The ADE7953 communicates over I²C (Default), SPI, and UART. These interfaces are hardware selectable by adjusting solder jumpers on the board.

The included current clamp features a ferrite core and a 13mm by 13mm opening, making it easy to wrap around your existing cables. Once clamped, it provides a 50mA output at its 100A rated input and supports a frequency range of 50Hz to 150kHz. It maintains an accurate ±3% non-linearity from 10% to 120% of the rated input current.

Hardware Connections and Breakouts

To make using the Non-Invasive Current Sensor as straightforward as possible, this kit provides several physical connection points for your monitoring hardware:

• Audio Jack Input: A 3.5mm jack connects to the ADE7953's Current Channel A, allowing users to easily connect the included current clamp directly to the board.
• Solderless Data: Dual Qwiic connectors provide a simple, daisy-chainable I²C connection to your main system.
• Current Channel Access: The board also breaks out both the A and B current channels to plated-through-hole pins but does not break out the ADE7953's voltage measurement channel, so this board can only measure AC current.

Finally, the current sensor has a 0.1"-spaced plated through-hole (PTH) header that breaks out the ADE7953's power and communication pins. It also routes to the ADE7953's interrupt pin and the Channel A zero-crossing pin. The Interrupt pin is a user-configurable active-VALUE signal that indicates events. The zero-crossing pin outputs a pulse each time the current waveform crosses zero, thereby determining the line frequency and synchronising measurements to the AC cycle.

• Schematic
• KiCad Files
• Hookup Guide
• Datasheets:
  • ADE7953
  • SCT-013-000
• Qwiic Info Page
• GitHub Hardware Repo