💬 AC-DC double solid state relay module

[Nca78]

Temperature stabilized, but module became irresponsive. Switched on then off, it lit up but didn't appear in Domoticz log. Then after some time the power light of the arduino went off. Slow blow fuse is dead :(

When I power the arduino through the programmer everything is fine, so I suppose the HLK died

[okos]

@Nca78
You check out what's happened? My plate at the moment is working without a problem and the temperature in the box 35°C (bulb 40W)

But on the new board my domoticz does detect ds18b20 and I think the problem may be inaccurate soldering DS18B20 because it is a very small gap between the legs.
What do you think?

[Nca78]

@okos I think position of the ds18b20 is a real safety problem on this board. It's no use to put a relatively "safe" module like the HLK if we put secondary trace so close from the mains trace. Even without the ds18b20 soldered the traces are too close. I might drill the ds18b20 hole that is the closest from the main trace bigger to create some clearance.

But I think my problem was from faulty HLK. I put a new slow blow fuse and a new HLK, it was a pain to change it :) It's been running over 24h without problem now, didn't put a load yet.

[Daniel Oliveira]

I would like to suggest to move the termal fuse and the varistor.

I would move the temp fuse to where the SB fuse is, the latter to where the varistor is. And finally the varistor to where the "My Sensors Board" inscription is.

This would remove the mains trace from the middle of the PCB away from the ds18b20 and the connector for the switches.

It would also allow to move the NRF24 and the switched connector closer to the HLK and thus further from the mains connector.

Best regards

[Daniel Oliveira]

Can someone please point me out the software used to design the PCB?
If I got some time I would like to try out the improvements that I've mentioned before.
It makes more or less 10 years the last time that I've did some PCB design with Eagle, nostalgia.... :)

[tonnerre33]

This post is deleted!

[tonnerre33]

@Daniel-Oliveira

I think it's DipTrace ;)

[Nca78]

Running fine now, nearly one week with a load connected (2*28W tubes) and switching on/off without a problem.

[okos]

@Nca78 said:

Running fine now, nearly one week with a load connected (2*28W tubes) and switching on/off without a problem.

Super :smile:
I solder already the third board, and I hope that the thermometer will be visible in domoticz.

[Mercury69]

Dear All,

I'm interested in build some exemplar of this beautiful project, so for that reason I ordered all the items present in Bill Of Material.

I ordererd most of the item without problem, but I get in trouble in finding the "Slow Blow Fuse (250v 0.2A)", as in the link given, the 0.2A fuse is not available and in plus the seller doesn't send to Italy.

For that reason I started a search in a lot of different shop, from the most knowed to the less knowed, but I'm not able to find it for a reasonable price.
As example I found a Company that sell 10 of it for a total of 3.40$ but they ship it for 35$, so I think is a nonsense.
Other Company only sell minimum quantity of 1000 item, but I don't need that amount and in plus the price will become very high.

So for that reason I ask you if someone can suggest me an internet shop where I can find it for a reasonable price (item+shipping), or eventually if it's possible to substitute that "Slow Blow Fuse (250v 0.2A)" with different kind of fuse maybe more easy to find.

Or as a last chance, if someone eventually have 10 of it and is available to send me (off course I will pay for the item and for the shipping) in Italy.

Thank you in advance for your attention.

[Amster]

@Mercury69
See: Aliexpress Sorry these required a fuse holder :disappointed:

maybe this one ? Mouser.it

[Nca78]

Sorry the shop I bought mine from doesn't sell a single fuse anymore ...
I don't know if these fuses will fit on the board but they are the closest specced having some leads :
https://www.aliexpress.com/item/10-pcs-lot-T250mA-250V-TE5-Slow-Blow-Subminiature-Fuse-UL-VDE-RoHS-Approved-250mA/32712347448.html

I think it would be better for next revision of this board or future boards powered from main to use a fuse holder...

[Mercury69]

Thank you to all for your rapid answer.

@Amster
I saw the fuse in Mouser website, I think the same one is the following:

http://www.mouser.it/ProductDetail/Littelfuse/0875200MXEP/?qs=%2Fha2pyFadugxaz6Ka1QIzhvtD8HnMnU0Sbd%2Fe9cxA257in2%2FbECi0w==

I also called they and they told me that only after I will put the order they check the real availability in the various site they have and if present they send me, but if not present I have to wait 10 Week as this is the Factory Lead Time.
And more of this the shipping will cost 20€, so a total of 39,80€ for 10 little fuse I think is too much.

@Nca78

I think I will go for the one you suggest. It's cheap, with free shipping and it seems not to big to don't fit in the board.

Now I will have to wait about 1 month before all parts arrive, then I will let you know if fuse will fit or not.

Thank you again for your attention and a big hello from Italy.

[mr_const]

I bought here in Ukraine circular-shaped slow-blow fuses and soldered them almost normally (here is their datasheet http://www.rcscomponents.kiev.ua/datasheets/5rt.JPG), so far everything is ok.
And here is my board instance:

[jendrush]

Very nice project. I would like to have access to few more pins to add some functionality like motion sensor, and light sensor. Of course those would be outside of the wall :)

[Nca78]

@jendrush said:

Very nice project. I would like to have access to few more pins to add some functionality like motion sensor, and light sensor. Of course those would be outside of the wall :)

Hello, I would not advise to use this board with sensors accessible to fingers. The spacing between main voltage and low voltage traces is too narrow at some points on the board and a short circuit is possible. It is fine/safe to use only in a closed box or connected to wall switches as they are designed to be safe with main voltage.

[jendrush]

@Nca78 said:

Hello, I would not advise to use this board with sensors accessible to fingers. The spacing between main voltage and low voltage traces is too narrow at some points on the board and a short circuit is possible. It is fine/safe to use only in a closed box or connected to wall switches as they are designed to be safe with main voltage.

I think that woundn't be so risky becouse o think about mounting it not behind light buttons, but in this box just below ceiling(where wires crossing their paths), this box is placed more than 2 meters above floor level.

[Nca78]

@jendrush said:

I think that woundn't be so risky becouse o think about mounting it not behind light buttons, but in this box just below ceiling(where wires crossing their paths), this box is placed more than 2 meters above floor level.

Still a bit, no ?
Anyway if you have requirement for a board that would be both easy to solder and safe even outside of electrical box, can you send them to me by private message ? I'm working on such a board and I'm opened to any improvement ideas of use cases that would not be filled by currently available boards.

[jendrush]

@Nca78 said:

Anyway if you have requirement for a board that would be both easy to solder and safe even outside of electrical box, can you send them to me by private message ? I'm working on such a board and I'm opened to any improvement ideas of use cases that would not be filled by currently available boards.

I've just thought about little node that could be mounted in almost every room, and be barely visible. This box below ceiling is quite good place for this. I have plan to do something like dome(3d printed) instead of flat box cover to fit electronics there. As i told in previous messages i would like to have node that could turn on/off light, read temperature, movement, and light level by LDR.

[okos]

Hello.
I would like to ask whether it is normal that the switch does not work if the server domoticz off? I want to use the switch only crash server :flushed: now i cant