5V/12V 2 Way Relay Board Module for Arduino Raspberry Pi ARM AVR DSP PIC
Seeit WIF-RELAY01-12V Relay for Relay Control Card for Arduino, AVR, PIC, Raspberry Pi, TTL
How to wire a Rpi, a relay, a DPDT and a PWM module to a DC motor, allowing to control its direction and speed? - Electrical Engineering Stack Exchange
One 1 Channel 12V LED Relay Module Raspberry Pi Arduino NEW
12V 1/2/4/8 Channel Relay Board Module for Arduino Raspberry Pi ARM AVR DSP PIC | eBay
Control electronics using a relay | The Raspberry Pi Guide