> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 3 Channel Relay Module Shield Smart Home for Raspberry Pi

**Type:** Product page · **SKU:** WS-11638 · **Brand:** [Waveshare](https://core-electronics.com.au/brands/waveshare-in-australia)
**Page:** https://core-electronics.com.au/3-channel-relay-module-shield-smart-home-for-raspberry-pi-3.html ([markdown](https://core-electronics.com.au/3-channel-relay-module-shield-smart-home-for-raspberry-pi-3.html.md))

Perfect for simple home-automation projects, this module allows your Raspberry Pi to control three independent relays, allowing you to easily control high-current loads while keeping your Pi safely isolated. All the necessary driver circuitry is on-board, and control is as simple as driving a GPIO pin high or low

## Pricing

- **Price:** $26.10 (inc GST) — $23.73 AUD, exc GST
- **Quantity discounts:** 10+ $22.78 (exc GST) · 25+ $22.06 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 21 today, and up to 300 more in 12–19 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=WS-11638:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/WS-11638:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Perfect for simple home-automation projects, this module allows your Raspberry Pi to control three independent relays, allowing you to easily control high-current loads while keeping your Pi safely isolated. All the necessary driver circuitry is on-board, and control is as simple as driving a GPIO pin high or low. Relays can be easily disconnected from their corresponding GPIO by removing an on-board jumper, allowing you to free-up unused channels for other purposes. Standoffs are included to help secure the module to your Pi.

To get you started, we have a simple python script that you can download (must have internet connection):

 ```
curl -L http://coreelec.io/34 >> relay-test.py
```

Then run it with

 ```
python relay-test.py
```

You should see the relays sequence on then off.

**Note:** This is compatible with all Pi 3 and 4 model B/B+ boards.

### Tech Specs:

- Relay contacts: SPDT
- Relay contact rating: 10A (30VDC / 250VAC)
- CH1: GPIO 26
- CH2: GPIO 20
- CH3: GPIO 21
 

### Dimensions:

![Board Dimensions](https://core-electronics.com.au/attachments/localcontent/RPi-Relay-Board-size_39019eaad5c.jpg)

- 3mm mounting holes
- Approximately 16mm tall with relays installed
- Female Pi headers on the bottom of the board are approximately 13.5mm tall
 
**Further reading:**

- www.waveshare.com/wiki/RPi\_Relay\_Board

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/c/e/ce04864.jpg)