Relay

The SPI_relay board

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

Overview

This board enables you to drive two relays.

Assembly instructions

None: the board comes fully assembled.

Additional software

Related projects

• Temperature_control

Pinout

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
Only for BigRelay:
7	NO	Normally open contact for relay 3
8	C	center connection for relay 3
9	NC	normally closed contact for relay 3
10	NO	Normally open contact for relay 4
11	C	center connection for relay 4
12	NC	normally closed contact for relay 4
13	NO	Normally open contact for relay 5
14	C	center connection for relay 5
15	NC	normally closed contact for relay 5
16	NO	Normally open contact for relay 6
17	C	center connection for relay 6
18	NC	normally closed contact for relay 6

LEDs

There is one power led.

On the regular relay board are two LEDs near each of the relays indicating the state of the relays. The BigRelay board doesn't have indication LEDs.

Protocol

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.

Changelog

1.0

• Initial public release