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Non-invasive AC current sensor board for smart energy monitoring. Works with ESPHome & Home Assistant.

Sap – AC Measurement Expansion PCB

Sold by Sprig Labs

$13.86

No tax for United States [change]
This product also has a 4-channel version, to measure 4 indepentent current sources at the same time. Using the potentiometers you can fine-tune the current measurement for each channel.
Bundle Deal: Get Sap together with the Sprig-C3 devkit at a discounted price. Perfect for plug-and-play Home Assistant integration.
Stock available: 2
Home automation
ESP32
Sensors
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What is it?

Sap is a compact, non-invasive AC current measurement module designed to work seamlessly with the Sprig ESP32-C3 Development Board and the SprigStack ecosystem. Using a Current Transformer (CT) sensor, Sap enables safe and reliable monitoring of AC power consumption for smart home and IoT projects.

Why did you make it?

Monitoring power usage is key to building smarter and more energy-efficient systems. We created Sap to give makers and DIYers an easy way to track current draw from AC appliances without modifying high-voltage wiring.

What makes it special?

✔ Non-Invasive AC Monitoring – Safe current sensing with standard CT clamps (e.g., SCT-013).
✔ Compact & Modular – Easily stacks with the Sprig ESP32-C3 and other SprigStack modules.
✔ Ideal for Smart Homes – Monitor appliances, detect usage patterns, or trigger automations.
✔ ESPHome & Home Assistant Ready – Integrates smoothly into your smart home setup.
✔ Simple & Safe – Designed for reliability and low-interference sensing.

Sap is perfect for tracking power usage on devices like water heaters, washing machines, HVAC units, or any AC load. Add smart energy insights to your projects—one watt at a time.

Links to code and documentation

Documentation (github.com)

Shipping policy

No information available.
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The seller

Sprig Labs

Sprig Labs logo

Edessa, Greece
0 orders since Aug 21, 2025
Sprig Labs designs and builds smart electronics, DIY kits, and 3D printed solutions for makers and tinkerers. From modular ESP32 development boards to custom controllers, power solutions, and smart home gadgets, every product is engineered, tested, and assembled in-house in Greece. Our mission is to make electronics more accessible, reliable, and fun—whether you’re prototyping, upgrading your home, or powering your next big project.