Waveshare RPi-Relay-8CH Relay Expansion Board provides eight relay channels that plug into the Raspberry Pi's 40-pin GPIO header, enabling the Pi to switch external circuits directly. Compatible with Raspberry Pi A+/B+/2B/3B/3B+ via the standard GPIO interface and powered by a 5V supply, this expansion board lets you control multiple high-voltage loads from a single Pi. Each channel is independently activated by a GPIO line, making it a practical choice for home automation, laboratory experiments, or DIY projects that require reliable software-controlled switching of external devices.
