Needs to be driven by 5v. A Darlington Array is required to switch the voltage from 3.3v to 5v (ULN2803 Darlington Array)
I am planning on linking it through an I2C device
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=15317
http://raspi.tv/2012/the-self-resetting-raspberry-pi
| 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM AVR CN | |
 |
$7.95 End Date: Saturday Dec-22-2018 4:47:28 PST Buy It Now for only: $7.95 |
| 8 Channel 5V Relay Shield Module Board Cables Arduino Raspberry Pi ARM AVR | |
 |
$8.49 End Date: Saturday Dec-29-2018 7:53:41 PST Buy It Now for only: $8.49 |
| 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM AVR CN | |
 |
$7.85 End Date: Thursday Jan-10-2019 7:38:34 PST Buy It Now for only: $7.85 |
| 5V 1 2 4 6 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR | |
 |
$1.07 End Date: Tuesday Dec-25-2018 5:31:12 PST Buy It Now for only: $1.07 |
| 5V 1 2 4 8 Channel Relay Board Module for Arduino Raspberry Pi ARM AVR DSP PIC | |
 |
$5.39 End Date: Monday Jan-7-2019 23:50:04 PST Buy It Now for only: $5.39 |
| 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM AVR CN | |
 |
$7.99 End Date: Monday Dec-24-2018 17:49:03 PST Buy It Now for only: $7.99 |
| 2PCS 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM AVR CN | |
 |
$11.95 End Date: Friday Dec-28-2018 9:28:49 PST Buy It Now for only: $11.95 |
| 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM AVR CN | |
 |
$7.49 End Date: Wednesday Dec-26-2018 5:42:10 PST Buy It Now for only: $7.49 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR RS | |
 |
$5.47 End Date: Wednesday Dec-19-2018 21:45:37 PST Buy It Now for only: $5.47 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR TW | |
 |
$5.70 End Date: Thursday Jan-10-2019 14:16:05 PST Buy It Now for only: $5.70 |