PIFace Relay+ Getting Started

For raspberry pi

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devices. Relay+ gives you the control over as many circuits as you need. It couldn't be easier to
take advantage of the Raspberry Pi® with Relay+ to control your projects over the Internet.
Product highlights
Typical applications:
● Robotics
● Motor control
● Home automation
Features:
● 4 onboard relays
● 4 indicator LEDs
● One command install of easy to program software libaries
● Easy connection with screw terminals
● PiFace EXTRA expansion port compatible with:
○ PiFace™ Relay EXTRA - for more relay
○ PiFace™ Motor EXTRA - for H-bridge motor control
● Provides protection to your Raspberry Pi® from damage
● Raspberry Pi® HAT footprint
● Onboard EEPROM ready for HAT ID
● 3 address jumpers to allow stacking of up to 8 boards
● Jumper to select standalone, or connection to Raspberry Pi®'s power supply
● Easy to add switches/inputs with GPIOs
Technical specifications:
● 4 changeover relays, 20V 1A switching max
● PiFace EXTRA expansion port with 4 outputs and 4 GPIOs
● Additional 4 GPIOs with switchable pullups
● Operating Temp -40° to 70°
PiFace™ Relay+ is a highly expandable interface board for Raspberry Pi® with easy to connect
screw terminals. A range of pick and mix EXTRA boards allow you to further expand the
capabilities. If you need more connectivity, up to eight PiFace™ Relay+ boards can be stacked
on a single Raspberry Pi®. As PiFace™ Relay+ is HAT compatible, the stack fits perfectly on the
Raspberry Pi® A+ and B+ models.
Before using PiFace™ Relay+ or any PiFace™ EXTRA board always read the instructions
and follow precautions carefully.
For Raspberry Pi® - Getting started
Have complete control of your electronic environment and all your

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Summary of Contents for PIFace Relay+

  • Page 1 A range of pick and mix EXTRA boards allow you to further expand the capabilities. If you need more connectivity, up to eight PiFace™ Relay+ boards can be stacked on a single Raspberry Pi®. As PiFace™ Relay+ is HAT compatible, the stack fits perfectly on the Raspberry Pi® A+ and B+ models.
  • Page 2: Fitting Instructions

    EXTRA boards when plugging or unplugging. Attaching PiFace™ EXTRA boards Carefully line up all the pins of the PiFace™ EXTRA board with all the sockets on the PiFace™ Relay+. Once aligned, gently push the EXTRA board in until flush. *PiFace™ EXTRA board is shown simplified in this diagram.
  • Page 3 Tour of hardware...
  • Page 4: Hardware Features

    Hardware features 4 relays On PiFace™ Relay+ there are 4 relays. Each relay is connected to 3 screw terminals. Their function is printed on the underside of the PCB and shown in the diagram below. ● NC - Normally Closed contact ●...
  • Page 5: Jumper Settings

    When configured as outputs, 20mA per pin is available. 5V supply terminals PiFace™ Relay+ has a pair of screw terminals for power, which can be used to power the board and the Raspberry Pi®. Alternatively these terminals can be used to supply 5V to your circuit (subject to limits of the power supply), taken from the Raspberry Pi®’s 5V power rail.
  • Page 6 JP1 controls the least significant bit of the address, and JP3 the most significant bit. Power jumper JP4 selects whether the PiFace™ Relay+’s relays and any connected EXTRA board share the same power source as the Raspberry Pi®. This supply can be either provided through the Raspberry Pi®’s MicroUSB connector, or from an external supply provided through the Relay+’s...
  • Page 7 Writing an example Python program This example will walk you through how to write a Python program for PiFace™ Relay+ to turn a relay on and off. To write your program, open a Terminal window on your Raspberry Pi® and type ​...
  • Page 8: Compliance Information

    Alternative arrangements may apply in other jurisdictions. ● PiFace™ Relay+ board is CE marked. It is a class B product. The EMC emission test was performed with a PiFace™ Relay+ connected to a Raspberry Pi® Model B+. Due to the nature of the board, as a prototyping and rapid development board, fast transient immunity tests and conducted radio-frequency immunity tests have not been executed.
  • Page 9 For more information or ideas and projects visit: http://www.piface.org.uk PiFace™ is designed in the UK by OpenLX SP Ltd. Registered Office 145-157 St John Street, London, EC1V 4PW. PiFace™ is distributed by Premier Farnell UK, 150 Armley Road, Leeds LS12 2QQ, UK Manufactured in the UK.

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