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: Sunday Feb-9-2020 4:47:28 PST Buy It Now for only: $7.95 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR BR | |
 |
$5.16 End Date: Thursday Feb-20-2020 2:22:24 PST Buy It Now for only: $5.16 |
| 1 2 4 8 Channel 5V Relay Shield Module Board for Arduino Raspberry Pi ARM yk | |
 |
$1.45 End Date: Thursday Feb-20-2020 0:29:41 PST Buy It Now for only: $1.45 |
| 5V 1 2 4 6 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR | |
 |
$1.42 End Date: Wednesday Feb-5-2020 5:31:12 PST Buy It Now for only: $1.42 |
| 1 16 Channel 5V 12V Relay Module Board For Arduino Raspberry Pi ARM AVR DSP PIC | |
 |
$8.69 End Date: Sunday Feb-2-2020 0:44:29 PST Buy It Now for only: $8.69 |
| 5V 8 Channel Relay Module Board For Arduino AVR PIC MCU DSP ARM KY | |
 |
$5.32 End Date: Friday Jan-31-2020 23:39:20 PST Buy It Now for only: $5.32 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVR | |
 |
$0.99 End Date: Monday Jan-27-2020 7:01:14 PST Buy It Now for only: $0.99 |
| 8 Channel 5V Relay Shield Module Board Optocoupler module Arduino ARM PIC AVR KY | |
 |
$4.99 End Date: Tuesday Jan-28-2020 2:47:25 PST Buy It Now for only: $4.99 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM AVECU | |
 |
$6.48 End Date: Tuesday Feb-18-2020 3:17:10 PST Buy It Now for only: $6.48 |
| 5V 1 2 4 8 Channel Relay Board Module Optocoupler LED for Arduino PiC ARM MEUIJ | |
 |
$9.20 End Date: Tuesday Feb-4-2020 5:49:06 PST Buy It Now for only: $9.20 |