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ModMyPi PiOT Relay Board

Product Code:MMP-0293

Ex.Tax £24.99

Availability: 127

ModMyPi PiOT Relay Board
ModMyPi PiOT Relay Board
ModMyPi PiOT Relay Board
ModMyPi PiOT Relay Board
Questions16 Answers15 | Expand All
What about insulation of the switch?
I want switching ON/OFF the main power on a resistive load (230Vac 4A). But i'm not sure that the insulation between relay outputs are conform to IEC60335-1 or IEC60950, etc. due to the distance between PCB GND and the relay output (e.g. on the back of the PCB - distance must be at least 3mm).
  • We do not advise anyone to switch mains voltage.
    ModMyPi LTD
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Safety when using Solenoids/Inductive devices
Hi, I plan to use 4 12V Solenoids connected to the relay. They would be turned on a few times a day for a few seconds and never all at once. What protection is there against potential surges/interference coming back through the input pins when the Solenoid is turned off? For example, I've read that a diode is needed to stop this, but there is no mention of this on the board. Thanks!
Bob Jordan
  • There are flyback diodes installed on each of the relays for this protection. 
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Compatible with a Pi Zero W?
I can see that the Pi zero wirks with the PiOT board, but is this also the case for the W version?
  • Yes, this is compatible with all 40-pin GPIO Raspberry Pi's
    ModMyPi LTD
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Are standoffs included for stacking relay boards?
The instructions here suggest 19mm standoffs are included But without a bill of materials on the main product pages there's a bit of ambiguity regarding this.
  • Each board comes with 4x 18mm stand offs and 4x screws.
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Power supply
Am I right in my understanding that this board is powered from the RPi and doesn't need any addition power or circuitry to make the replay switch? I have used a "standalone" relays before that needed to have a resistor and transistor in to boost the power to enable the relay to switch. Sounds like this board doesn't need that. Cheers.
  • That's correct, no additional power is required to switch the relays.
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Does it use all PIN's?
Does it utilizes all Raspberry Pi pins or are there any not used so that in example thermometer can be pluged in
  • This board is programmable, which means you simply tell the board which GPIO pins to use. Meaning all other GPIOs (not programmed for the relay board) are available for use by other devices.  
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Case for stacked Boards
Is there a case for multiple stacked boards?
  • I'm afraid not
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Can the relays be used for controlling voltages lower than 24V DC?
In the description of the product it is mentioned that the 4 relays may be used for switching up to 10A @ 250VAC, or 10A @ 24VDC. Is it possible to directly control some 9VDC irigation solenoid valves?
Giorgos Chatz
  • Yes, those values are maximum ratings.
    ModMyPi LTD
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PiOT board and AM2302
I want to build an automated greenhouse controller. Can I still use the aforementioned sensor and it not interfere with the board or relay functionality?
  • Yes, they will work just fine together. Just remember not to configure your relay board to use the same pin as your sensor ;)
    ModMyPi LTD
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Conflict with Energenie Pi-Mote
I have one of these boards, plus an Energenie Pi-Mote board ( They work separately, but not together. I assume that there is some kind of conflict in pin usage - but can't figure out what. Can anyone help? NB It's not the ponds that I am using to switch the relays as these are definitely not used by the Energenie board.
Jonathan Collier
Rasclock and PioT ralys board
I am building a central heating controller for which I need a real time clock. Can you fit a Rasclock module on top of 2 PioT relay boards so that the relays work and the real time clock can be accessed. I will use RasPi 3 as I need wifi access to controller. I will be programming the controller in Java. Many thanks.
Jon Kerridge
  • Yeah shouldn't be a problem. You'll need to use the extra tall stacking headers, but if you are stacking multiple Relay boards you'll be using them anyway!
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Ribbon cable to connect to pi B
Hi, my son wants to control some small motors (in both directions), using his pi model b, to run a robot arm. It looks like the piot relay board is the best bet, am I right in thinking I need a 26 pin ribbon cable to connect this to the pi? I did also look at the picoborg but it looks like this gives more options to expand to run more motors by stacking boards, is this correct? Thanks
Matt S
  • A relay board isn't really the best way of controlling motors. If you want an expandable solution then I would recommend this - - One HAT can control 4 DC motors, but you can stack multiple HATs allowing control of up to 128 DC motors!
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How can you stack multiple boards
We need 2 relay module boards that we would like to stack on top of one another, is it possible to stack multiple relay module boards together on top of one Raspberry Pi? How can this also be incorporated with a T-Cobbler style board for the control circuitry?
Adrian Gray
  • Yes it is, if you stack the Relay Board on to the Pi like so - - you then simply add another extra tall header on to the pins sticking through the relay board, and then place another realy board on top. (hope that makes sense!)
    ModMyPi LTD
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Have you got dimensionally correct 3D Cad models of this?
If you have a 3D Cad model i can insert this into my assembly.
Jason Lawrence
  • We don't have 3D models, but if you post on our forums we can provide you with accurate 2D dimensions -
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why does this not work?
i want to have the 1st relat open an close repeatetly but it doesnt seem to work: import time import RPi.GPIO as GPIO GPIO.setmode(GPIO.BOARD) GPIO.setup(5,GPIO.OUT) i=0 print('Starting motor sequence!') app.SetAllOn() while True: try: i=i+1 GPIO.output(5,1) time.sleep(3) GPIO.output(5,0) print i except (KeyboardInterrupt) : print('Finishing up!') quit()
  • For technical support questions, please post on our forums:
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Showing 1 to 15 of 16 (2 pages)

The ModMyPi PiOT (Pi of Things) relay board is smart! Not quite Skynet smart, so you can tell John Connor to stay at home and play with his Raspberry Pi. But it's much smarter than your average relay board! We've created a Raspberry Pi Relay Board that does away with the complicated wiring and fiddly jumper configuration of your standard relay board, and bundled that control into an on-board PIC, making configuration faster, easier and safer. The PiOT relay board can be connected directly on top of the Pi, or via a GPIO ribbon cable (not included), and also features mounting points for the Raspberry Pi Zero. Each is board is fully assembled, and ready to plug and play! We also stock cases for the Raspberry Pi & Raspberry Pi Zero.

The PiOT relay board allows you to bond a GPIO pin to a relay with the touch of a button. No need to tie pins using resistors, and no need to re-wire the circuit when you want to change which GPIO pin fires which relay. Simply select your GPIO pin using the on-board tactile buttons and two-digit 7-segment display, and switch that pin high or low to fire your designated relay!

The on-board display can be configured to show the Pi's BCM or Pin number system for GPIO/relay bonding, and also demonstrates visual feedback of the relay on/off status for easy monitoring. The display can also be used to test relays before configuring them with your Pi, in addition to providing menu access for setting configuration.

The PiOT relay board also features multiple innovative start-up modes designed to combat "chatter" on the GPIO which can lead to unexpected behavior. Variable delayed start-up allows users to pause activation of the relays for a short period during boot, ensuring that GPIO pins are correctly set prior to use, or the alternative handshake mode utilises a specific pulse train to enable activation and de-activation of the relay board at the user's will. No more accidental switching of relays at boot!

The PiOT relay board uses low current (~100mA) PWM (pulse width modulation) to significantly reduce the current required to hold the relays on when compared to other relay boards. This means that relay boards can be stacked up to 5 high without requiring additional external power.

Warning! Relays can be used to switch large voltages and currents. Please, please, please be careful when undertaking any work with this type of power - it can kill!

The ModMyPi PiOT Relay Board Features:

  • 4 x SONGLE SRD-05VDC-SL-C Relays for Switching up to 10A @ 250VAC, or 10A @ 24VDC
  • 4 x Tactile Buttons for GPIO/Relay Bonding
  • Two-Digit 7 Segment Display for Visual Feedback & Setting Control
  • Micro-controlled GPIO/Relay Setting & Switching (No Jumpers Required!)
  • 40 Point Raspberry Pi GPIO Modelled Input
  • 5V & 3.3V Input Compatible
  • Low Holding Current via PWM ~ 100mA per Relay Board
  • Stackable Relay Board (Up to 5 Without External Power)
  • Multiple Start-Up Modes to Negate Boot GPIO Chatter (Delayed/Handshake)
  • Pi Zero Mounting Points


ModMyPi PiOT Relay Board Wiki

Example Code


OMRON G5LA-1 Datasheet

45K22 PIC Datasheet


Review and Introduction by Garage Tech Tips:

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