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Relay-based projects

A list of projects where the relays are doing some kind of processing or computing - i.e. something more than just switching a load.

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If you're into relay logic then you probably already know about many of these projects - but hopefully some are new to you and can give you additional insights and ideas for your own projects.

Hackaday relay projects

YGREC16 - YG's 16bits Relay Electronic Computer
https://hackaday.io/project/18757
(superseded by #YGREC-РЭС15-bis)

SPDT16: 16-bits arithmetic unit with relays
hackaday.io/project/10889
(superseded by the above project)
SPDT16
Kalin-Burkhart Logical Truth Calculator
hackaday.io/project/7871
4 bit relay adder
hackaday.io/project/3802
RISC Relay CPU
hackaday.io/project/11012
Relay Puzzle Box
hackaday.io/project/2075
Relay Logic Clock
hackaday.io/project/8683
Relay Computer
hackaday.io/project/10303
RelayRepRap
https://hackaday.io/project/11914-relayreprap
Brainfuck relay computer
https://hackaday.io/project/18599-brainfuck-relay-computer



Relay projects on other sites

Harry Porter's Relay Computer
web.cecs.pdx.edu/~harry/Relay
(see the video )
i² (i Squared
isquared.weebly.com
Basic relay computer
electronixandmore.com/projects/relaycomputer
Relay Computer Two
electronixandmore.com/projects/relaycomputertwo
RC-3
computerculture.org/projects/rc3
Zusie
www.nablaman.com/relay
Mercia
relaiscomputer.nl

Relay calculator
simonwinder.com/projects/relay-calculating-engine
Paul Laws's Relay Computer
relaycomputer.blogspot.my

Clicks
clicksrelaycpu.blogspot.my
A fistful of relays
github.com/Dovgalyuk/Relay/wiki/Build-log
Radiolok
rln.nnov.ru/index.php
github.com/radiolok/RelayComputer2
tqfp.org/radiolok/releynaya-evm-versiya-2-releynaya-logika-alu
TIM series
northdownfarm.co.uk/rory/tim
Duo 14 Premium
ostracodfiles.com/ostracod/relay.html
R500/7T
strangecalc.ch
Simon relay processor
cs.ubc.ca/~hilpert/e/simon
Relay Trainer
relaysbc.sourceforge.net
Relaiscomputer
relaiscomputer.de/pr.htm

Relaisrechner
schlaefendorf.de/relaisrechner/dokumentation
4-Bit Relay Adder
brainlubeonline.com/relaycomputer/RelayFramer.html
Neodem ALU/Computer
neodem.com/.../relay-computer


Inspirational relay projects

Pongmechanik
cyberniklas.de/pongmechanik


Software for relay projects

TOFU Circuit Simulator
meatfighter.com/tofu
Relayser - Relay logic simulator
github.com/SmallRoomLabs/Relayser

Youtube:


Relay theory & general info

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Mark wrote 03/29/2017 at 00:17 point

I'd like to be on the list.  Relays are a big part of the games I've built with retired electromechanical pinball machine parts.  Thanks.    funwithpinball.com/games

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Yann Guidon / YGDES wrote 03/29/2017 at 00:23 point

Welcome here !

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will.stevens wrote 03/24/2017 at 22:36 point

Hi, thanks for this great resource, please could you add my project. It's about making the relays from scratch, and then using the relays to make control circuitry:

https://hackaday.io/project/11914-relayreprap

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Yann Guidon / YGDES wrote 03/25/2017 at 01:53 point

Sure ! Thanks for the notice !

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Dave Gönner wrote 05/21/2016 at 16:38 point

Can we include this one as well?

http://www.cyberniklas.de/pongmechanik/indexen.html

It's a mechanical implementation of  Pong, with relays for the game logic

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matseng wrote 05/22/2016 at 02:47 point

Thanks. I added it in its own section "Inspirational projects" since there was no real technical info like diagrams/schematics and such about the projects, just a BOM.

Still it's a very cool project that I'd love to clone some day - just as I like to build this awesome (non-relay) based mechanical Lunar Lander game some day as well.  http://lushprojects.com/lunarlander/

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Yann Guidon / YGDES wrote 05/21/2016 at 14:34 point

Where did you find the background/avatar picture ? I don't remember this one.

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matseng wrote 05/21/2016 at 14:50 point

I cheated there a bit. I couldn't find a nice clear picture of an real old relay computer so I took some random picture from an old thelephone exchange instead :) 
http://www.bayern-online.com/v2261/artikel.cfm/203/Kennziffernspeicher.html

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Yann Guidon / YGDES wrote 05/21/2016 at 14:53 point

relays are also used to control machinery such as elevators :-)

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Dave Gönner wrote 05/21/2016 at 14:06 point

Thank you for adding me to this project, I'm honoured to be in such great company. These are all fantastic projects! I hope we can come up with innovative ways of using relays, or at least inspire a relay revival.

  Are you sure? yes | no

matseng wrote 05/21/2016 at 15:40 point

Hopefully it can and will. Or at least we will have use of the collection of projects :-)

I think your project is the most artfully laid out project in the list - especially for being bare pcbs. And also probably is one of the most useful of them as well...

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Dave Gönner wrote 05/21/2016 at 16:36 point

Thank you, that is a great compliment. I try to do my best. Functionality and visual appearance are both key considerations. 

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Yann Guidon / YGDES wrote 05/21/2016 at 12:50 point

Thanks for adding me, Mats, now it's your turn to show us what you can do with relays ;-)

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matseng wrote 05/21/2016 at 13:17 point

Still living without hardware :-(  That's why I'm currently hacking away at the last entry in the list - the Relayser.  When it's a bit more ready I can at least dry-run design a system while waiting for getting my stuff out of storage and shipped to a new place. But that is minimum two months away.

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