![Waveshare RPi Relay Board, with 3-way Relay Control, with Pi 40PIN GPIO Extension Header, Compatible with Raspberry Pi Series Boards, Used for Pi to Control High Voltage/Current Devices : Amazon.co.uk: Everything Else Waveshare RPi Relay Board, with 3-way Relay Control, with Pi 40PIN GPIO Extension Header, Compatible with Raspberry Pi Series Boards, Used for Pi to Control High Voltage/Current Devices : Amazon.co.uk: Everything Else](https://m.media-amazon.com/images/I/71HMXPl9VWL.jpg)
Waveshare RPi Relay Board, with 3-way Relay Control, with Pi 40PIN GPIO Extension Header, Compatible with Raspberry Pi Series Boards, Used for Pi to Control High Voltage/Current Devices : Amazon.co.uk: Everything Else
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wiring - Controlling Switches from both Raspberry Pi relay & Manual [Home Automation] - Raspberry Pi Stack Exchange
![Almost all relays stay on after adding a Darlington transistor array between gpio and relay IN · Issue #112 · fivdi/onoff · GitHub Almost all relays stay on after adding a Darlington transistor array between gpio and relay IN · Issue #112 · fivdi/onoff · GitHub](https://user-images.githubusercontent.com/2573903/41155848-84be7bfe-6aed-11e8-9be3-5ec0f31e49cc.jpg)