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Revision as of 18:11, 11 May 2012 by Rew (talk | contribs) (moved SPI relay to Relay)

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The SPI_relay board
The SPI_relay board

This is the documentation page for the SPI_relay and I2C_relay boards.


This board enables you to drive two relays.

Assembly instructions

None: the board comes fully assembled.

External resources


Additional software

Related projects


For the SPI connector see: SPI_connector_pinout.

For the I2C connector see: I2C_connector_pinout.

pin function remark
1 NO 1 Normally open contact for relay 1
2 C 1 center connection for relay 1
3 NC 1 normally closed contact for relay 1
4 NO 2 Normally open contact for relay 2
5 C 2 center connection for relay 2
6 NC 2 normally closed contact for relay 2


There is one power led.

There are two LEDs near each of the relays indicating the state of the relays.

Jumper settings


To make the relay PCB do things, you need to send things over the SPI bus to the PCB.

The general overview of the protocol is here.

The specific commands for the relay PCB are explained on the page about the spi_dio board, as the two boards share the same protocol: spi_dio_protocol .

For arduino, a sample PDE is available, called ardemo_lcd.pde, also at BitWizard software download directory .

This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the dio and relay boards as well.

The software

Default operation

Future hardware enhancements

Future software enhancements



  • Initial public release