Data Sheet

ManualsBrandsSequent Microsystems ManualsMicrocontroller AccessoriesSequent Microsystems 8-RELAY Expansion HAT for Raspberry Pi

8-RELAY EXPANSION CARD FOR RASPBERRY PI

www.sequentmicrosystems.com

USER'S GUIDE VERSION 1.1

GENERAL DESCRIPTION ................................................................................................................................. 2

BOARD LAYOUT ............................................................................................................................................. 3

BLOCK DIAGRAM ........................................................................................................................................... 3

COMPONENT DESCRIPTION .......................................................................................................................... 4

CONFIGURATION JUMPERS .......................................................................................................................... 4

RELAY HEADERS ............................................................................................................................................ 5

POWER REQUIREMENTS ............................................................................................................................... 6

MECHANICAL SPECIFICATIONS ..................................................................................................................... 7

SOFTWARE SETUP ......................................................................................................................................... 8

AD-ON CARDS ............................................................................................................................................. 10

LED-CARD ................................................................................................................................................ 10

BREAK-OUT CARD ................................................................................................................................... 11

DIN-RAIL KIT for RASPBERRY PI ............................................................................................................... 12

MEGA-IO EXPANSION CARD .................................................................................................................... 13

Summary of content (13 pages)

PAGE 1
8-RELAY EXPANSION CARD FOR RASPBERRY PI www.sequentmicrosystems.com USER'S GUIDE VERSION 1.1 GENERAL DESCRIPTION................................................................................................................................. 2 BOARD LAYOUT ............................................................................................................................................. 3 BLOCK DIAGRAM ................................................................................................
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GENERAL DESCRIPTION The 8-RELAY card is a stackable expansion card for Raspberry Pi B+, 2, 3 and Zero. It offers a compact and inexpensive solution for adding up to 64 relays to a Raspberry Pi project. Two of the Raspberry Pi’s GPIO pins are used for I2C communication, leaving 24 GPIO pins available for the user.
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BOARD LAYOUT BLOCK DIAGRAM 3
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COMPONENT DESCRIPTION The top 40 pin header plugs into the Raspberry Pi GPIO header and passed through the pins to the next MEGA-IO expansion card. The eight relays are numbered from upper left to lower right. Numbering the Relays is important to associate them correctly with the Relay Headers and Relay LEDs. The Relays are SPST, with three output pins labeled COM, NO and NC. The Relay LEDs are right angle, to permit visual inspection of the relays status when multiple cards are stacked.
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RELAY HEADERS 5
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POWER REQUIREMENTS The 8-RELAY card requires +5V power, supplied either from the Raspberry Pi expansion bus, or from its own 2.1mm power jack. The on-board relays are connected to the +5V. Only one +5V source can be used to power both the Raspberry Pi and the 8-Relay card. Raspberry Pi 3 current consumption: 250 mA @ +5V 8-RELAY Card current consumption: 10 mA @ +5V (all relays OFF) 750 mA @ +5V (all relays ON) The USB connector which powers the Raspberry Pi can supply maximum 1.5A.
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MECHANICAL SPECIFICATIONS 7
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SOFTWARE SETUP The 8-Relay board occupies the I2C addresses from 0x20 to 0x27. 1. Have your Raspberry Pi ready with the latest OS. 2. Install the Wiring Pi library (many thanks to Gordon Henderson) 3. Enable I2C communication: ~$ sudo raspi-config 4. Install the relay8 software from github.com: ~$ git clone https://github.com/SequentMicrosystems/relay8.git 5. ~$ cd /home/pi/relay8-rpi 6. ~/relay8-rpi$ sudo make install 7.
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3.
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AD-ON CARDS LED-CARD The LED card plugs into the Raspberry Pi expansion connector. Its main function is to show in top-view the status of the relays, but it can be used as a general purpose, 32 LED card to show the status of any input or output. Any LED can be turned on or off using the command “relay8 led [1-32] on/off”. The LED card can show the status of relays from up to four 8-Relay cards.
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BREAK-OUT CARD The Break-out card plugs into the Raspberry Pi expansion connector and brings all the IO pins to screwtype terminal blocks.
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DIN-RAIL KIT for RASPBERRY PI The DIN-Rail Kit permits mounting any Raspberry Pi on a DIN-Rail. It contains all the necessary screws and stand-offs.
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MEGA-IO EXPANSION CARD The MEGA-IO is a stackable expansion card for Raspberry Pi B+, 2, 3 and Zero. Up to four MEGA-IO and/or 8-RELAY cards can be mixed in the same stack.