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Forum Index : Microcontroller and PC projects : Latching Relay Board 1A...
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
Hi folks. 
Here is my latching relay PCB. Lets you control up to four sperate DPDT latching relays on the one board. Full transistor driving on-board, and all relay contacts brought out to pin headers. 50 x 50 PCB size, so nice and small-ish. Each relay can handle up to 2A @ 30v DC per pole. PLEASE NOTE THAT THIS BOARD IS NOT DESIGNED FOR, NOR SHOULD IT EVER BE USED TO SWITCH MAINS VOLTAGE. I would hope that members here would know that, but I feel I should point that out, before someone makes the attempt. If you need to switch more then 2A, you can use the latching relay, to switch other more powerful relays - that is actually how I have one of the prototype latching relay circuits setup. I will be getting some of these made next week(as 2x2 panels), so if anyone is interested, flick me a PM. All standard through-hole parts(easy to build!), and you can buy the Panasonic relays from eBay - US12.95 for ten relays. Being that these relays are made by Panasonic, they should not be hard to find elsewhere if eBay run out. RELAY LINK There is a link to the PDF for these relays, on the eBay link if you follow that. These relays are actually 4.5v coil, designed specifically for being driven by a transistor and 5v supply. TOP COPPER: 
BOTTOM COPPER: 
Smoke makes things work. When the smoke gets out, it stops! |
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centrex Guru  Joined: 13/11/2011 Location: AustraliaPosts: 320 |
Hi Grogs An interesting board, but have you received the speed controllers of a previous post. Also do you have a eta for the fat mite and the thin mite. Cliff Cliff |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
What speed controllers? Do you mean those 40A things designed for Arduino use you could get on eBay? If so, then yes, I have them, and they seem to do what is asked. By "Thin-mite", I assume you mean the Skinny 64-pin based on the 470 chip - these are currently in production, and I will let the forums know when I hear anything from the factory. FAT-mite(SD-card/Micromite hybrid thing) concept has essentially been put on the back-burner, as I thought there did not seem to be much interest in it. I can still persevere with the FAT-mite concept, if you are interested in it - gives me another PCB to play with... Smoke makes things work. When the smoke gets out, it stops! |
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| viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
Very cool Grogster.!!! You are quite the board meister!! |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
Boards arrived and I finally got a chance to assemble one. 
I have been able to get reliable operation down to a 2ms pulse. Any shorter then this, and the relay fails to latch. 3ms would be a safe figure to ensure correct operation. Discussions on this thread have convinced me to swap the high-side diodes for plain resistors. Original called for 47-ohm resistors, so I put two 100-ohm resistors in parallel(one where the 47 was, the other where the diode was, which wires them in parallel) to give me a final resistance of 50-ohms or so, which is pretty close to 47. 
I still have 39 of these boards, so if anyone wants one, flick me a PM. US$5 for a board including airmail to anywhere on the planet. US$10 for a panel of four boards including airmail to anywhere on the planet. Board only - you will need to populate. All through-hole assembly. Smoke makes things work. When the smoke gets out, it stops! |
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