# Sap – AC Measurement Expansion PCB

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

- **Seller:** [Sprig Labs](https://lectronz.com/stores/spriglabs), Edessa, Greece
- **Price:** €11.94 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Home automation, ESP32, Sensors
- **Product page:** https://lectronz.com/products/sap-ac-measurement-expansion-pcb

## Options

**Number of channels**

- 1-Channel (4 left)
- 4-Channel [Add €5.93] (2 left)

**Sprig Bundles**

- Sap only (2 left)
- Sap + Sprig-C3 Devkit [Add €8.00] (2 left)

## Links

- [Documentation](https://github.com/Frapais/Sap-ESP32-AC-meter)

## Images

![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMjgsInB1ciI6ImJsb2JfaWQifX0=--80111389e3e2879f8df0aac009c88c8b45d00c48/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image1.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMjksInB1ciI6ImJsb2JfaWQifX0=--4d21893eb63dbac40ad5c5d5c8f633352de01bc9/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image3.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMzAsInB1ciI6ImJsb2JfaWQifX0=--a42aef5da806b9ee6a739521b522944b6aa256f1/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image2.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMzEsInB1ciI6ImJsb2JfaWQifX0=--47d95152deeee7080be86e8c3494c4ca42d1a0e8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image6.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMzIsInB1ciI6ImJsb2JfaWQifX0=--972776796c22807d1b18aa25ba7abb01860e345c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image5.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMzMsInB1ciI6ImJsb2JfaWQifX0=--7dfc81a506215f62f11302764da21c4b93c687c8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image4.jpg)
![Sap – AC Measurement Expansion PCB](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQzMzQsInB1ciI6ImJsb2JfaWQifX0=--dd2e01ecdad0f89a8b229dc5375287660eaa3dc8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2025-08-22T13-3A47-3A22.339Z-image7.jpg)

## Description

#### **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.  

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#### **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.  

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#### **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.

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**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**.