The PiRelay is a Raspberry Pi relay HAT that lets you control high-current and high-voltage devices directly from your Pi. Transform your home appliances into smart IoT devices with four independent relay channels capable of switching loads up to 240VAC/7A or 125VDC/10A. The standardised HAT form factor connects smoothly to any 40-pin Raspberry Pi, with a stacking header that keeps GPIO pins accessible for additional boards. LED indicators show relay status at a glance for easy debugging. Key Features 4 Independent Relays – Control up to four appliances simultaneously High Power Switching – Handles 240VAC/7A or 125VDC/10A per relay Status LEDs – Visual indicator for each relay state Stacking Header – 40-pin passthrough keeps GPIO accessible Flexible Wiring – COM, NO (Normally Open), and NC (Normally Closed) terminals per relay Configurable GPIO – Remove jumpers to use custom GPIO pins Mobile App Control – PiRelay Android app available Specifications Relay Rating: 240VAC/7A, 125VDC/10A Number of Relays: 4 Default GPIO Pins: GPIO 4, 17, 27, 22 Compatibility: Raspberry Pi 4, 3B+, 3, 2, Zero (all 40-pin models) GPIO Pin Mapping Pin 2: 5V Power Pin 6: GND Pin 7 (GPIO 4): Relay 4 Pin 11 (GPIO 17): Relay 3 Pin 13 (GPIO 27): Relay 2 Pin 15 (GPIO 22): Relay 1 Ideal For Home automation and IoT projects Controlling lights, fans, and appliances Industrial control applications Switching high-power loads from Raspberry Pi Package Contents 1× PiRelay HAT 2× Standoffs Warning: This board switches mains voltage. Ensure all high-voltage wiring is performed by a qualified electrician and follows local electrical codes. Resources Getting Started Guide Example Code and Python Library
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