In wall - PCB, (AC to DC 5v)

[ahmedadelhosni]

Good step. Is there any 3d pictures ?

The nrf is pointed upward. Won't it be outside the 2.5x5 space ?

[sundberg84]

No 3D pictures, I dont know how to make that - but ill see if i can learn.
Yea, the nrf is outside to dont block the radio waves... it might be a litte to much, I will make some more measurments:

[Samuel235]

Do we know if the radio signals will get distorded or blocked in any way if installed into a metal/galvenised socket box? I'm really interested in something like this for the 'standard' style lightswitches i'm making at the moment.

[ahmedadelhosni]

@samuel235 You can test and monitor the performance. Watch also this antenna modification by @petewill https://www.youtube.com/watch?v=NpMnauHeR7Y

[Samuel235]

@ahmedadelhosni I have seen how you can increase the signal reading capabilities, i was just wondering if the steel backbox would affect the rate at which the signal came into the radio with it being inside of the metal box.

[sundberg84]

@samuel235 Probably! I had this problem when i had the radion in between two pcb a while ago. Relocating the radio changed the effect on it so I think there might be problem if ju isolate the radio with metal.

[m26872]

@sundberg84 I don't like the creepage distance to those display-pins in the middle of the relay footprint. It looks like there's plenty of space to move it, eg beneath "sensors". Also due to the EMI-risk from relay switch.

Maybe you also want increase the width and solder-mask the middle of the relay high power traces.

The panelizing holes will probably be hard to break without damage to the pads. At least try to move them closer together.

[Samuel235]

So, i need to test my module inside of a metal backbox then, and if it receives interference we could do with coming up for a solution because most of the 'older' UK Style houses that i work within use metal back boxes. So if we could come up with a work around, it would broaden the possible audience.

[sundberg84]

@samuel235 I would have tried to attach the radio with jumper wires and put the radio outside the metal box somehow.

[Samuel235]

That would be incredibly difficult to do if you're using a metal box purely for the reason of having no room between the brick and the plasterboard (Or whatever finished product you use over where you live).

[petewill]

@samuel235 You will probably have to face the radio so it's pointing through the plastic cover (not the metal box) and use repeaters in the rooms where necessary.

[Samuel235]

@petewill I shall give this a test! I'll report back soon, hopefully.

[bjacobse]

Looks great, will you consider to create a version with 2 relays so it will be similar like the Fibaro 2 relay or Qubino 2 relay
I also live in Sweden (Using same wall mechanical dimensions) and are searching exactly for a Mysensor relay 2 device to hide in the wall

link to Fibaro 2 Relay zwave device

[sundberg84]

@bjacobse My thought was to first create one working pcb to start with and leave the upper side for sensors.
This way you can recreate that upper pcb for the needs you have and just add it as a shield to the lower pcb.

[scalz]

@sundberg84: hi nice idea :smiley:
just for curiosity, what does "sweden" box look like??? I live in France, and here the most common style/size is like this: http://www.leroymerlin.fr/v3/p/produits/boite-d-encastrement-legrand-pour-mur-creux-d-67-mm-e29984
is it like yours??

[korttoma]

This is what I have in my walls and these in the roof in a house in Finland. I bet they are similar in Sweden.

[scalz]

thx :smile:
it seems you have good quality/strong box :wink: not cheap, a little bit bigger than ours. interesting to see difference. so in future, if I will make something inwall for me, it will fit to "nordic" box. cool. unfortunately maybe not the holes...I will check this. but it's not a big problem I think. good to know.

[sundberg84]

Yea. Mine is about d =6,5 mm as well. Reminds of yours.

[sundberg84]

I ended up re-thinking this - and I think this is better.
Now all components are located to 1 pcb, with an empty shield.
This makes it possible to have a standard PCB and just create the shield or make one from a empty board.

@m26872 and everyone else - my biggest consern is the distanse between the high power and rest - what do you think? Im no expert.

[Samuel235]

The issue that i personally have at the moment with locating this style of sensor behind a switch is that the slimline boxes in UK have around 15mm of room (depth) inside once the switch itself is fitted. There is slightly more room around the sides but the middle section is around 15mm. I'm now wondering how hard it would be to maybe create a slimmer version or slightly longer, say 70/75mm in length?