💬 Wall Socket Insertable Node

[Koresh]

@Sander-Teunissen
I will make a small presentation of new boards tomorrow in Breda. Of course I will try to start mass production asap :) You can check estimated prices of all boards in button size radionode thread.

[tonnerre33]

Hi, it's a very intersting project but what about the protections of the switching power supply ?

I see a varistor but neither fuse nor Thermal Cutoffs.

[Koresh]

@tonnerre33 do not worry. It will be in final version + we can use temperature sensor in rfm modult to switch of the relay.

[sincze]

Very nice to see this device today live in Breda ;-)

[fisher]

Very nice project. Looking forward to buy it. It would be nice to have possibility to trigger switch via local button (as in Fibaro) and not only via radio. It's possible from software point of view but board should be modified slightly. Is it in your todo list @Koresh?

[yury]

@fisher are you referring to touch sensor button or momentary push button?

[fisher]

@yury yes

[Koresh]

@fisher said:

Very nice project. Looking forward to buy it. It would be nice to have possibility to trigger switch via local button (as in Fibaro) and not only via radio. It's possible from software point of view but board should be modified slightly. Is it in your todo list @Koresh?

Thanks! We thought about this feature, thanks for your reminder. I've successully added pins for button. You can see new JST connector for button on the screenshot below. I hope this solution is reliable enough

I almost forgot... Now this board contains SPI flash which implements OTA upgrade ability :wink:

[fisher]

@Koresh Perfect! Do you know when the modules will be ready for sale? How they will be sold? Direct sale, ebay, ...?
Do you have further development plans, ex. dimmers, wall node with two relays, blind controllers?

[fisher]

@Koresh Another thing I forgot. Are you considering to design and sale any plastic case to your modules? Putting raw electronics to tight wall socket is not the safest solution :)

[Koresh]

@fisher said:

@Koresh Another thing I forgot. Are you considering to design and sale any plastic case to your modules? Putting raw electronics to tight wall socket is not the safest solution :)

We plan to supply small plastic case because without this case it is impossible to get CE mark (it must be on the case). After buying you can extract the board and put it under socket if you want. But I do not agree with your thesis about safety. We tried to explain it in our presentation in Breda. The safest case - no case :wink: Do not forget this module will have all of fuses (thermal cutt off, overvoltage varistor, slow fuse) and of course we will do all possible steps to isolate danger points.

[fisher]

@Koresh Is there any video from Breda meeting?

[yury]

@fisher said:

Putting raw electronics to tight wall socket is not the safest solution

We think to use as "standalone case" this one:

https://www.alibaba.com/product-detail/72-25-mm-LED-drive-power_60426277938.html?spm=a2700.7724838.0.0.QARRdD

As for safety in "tight wall socket", the point here is:

1. All those wall socket boxes is really safe Ip 20 or 44 certified together with socket itself.
2. If something happens inside this crimped space will stay there.

This node will have thermal fuse, Over-voltage varistor, and if you short cut the relay - ACS 712 has build in "fuse".

So I think inside a wall is still much safer. How to put it safely there - it is another topic. At least you have to have experience in fixing things at home and for sure cut off power!

I tried to burn this thing many times as we tested it. so far most impressive was relay short cut test. Re-soldering new ACS712 fixed thing back. Relay survived also.

Traces of the test on the case. Not even melting traces, just smoked out:

[PierreSt]

Would it be possible for the diameter of the box to be smaller? In Germany the standard wall sockets are 68mm. So 60-65 mm fot the box would be ideal.

[yury]

@PierreSt

www.aliexpress.com/item/55-22mm-5pcs-LED-ceiling-circular-drive-casing-fire-retardant-PC-power-supply-housing-with-cooling/32643161481.html?spm=2114.13010608.0.72.VRC6ws

is the smallest. will get them soon. not sure if the thing will fit inside though.

So far we a bit stuck with our PCBA contractor. Negotiating hard for better prices.

[Sander Teunissen]

Any update on your progress ? I am really watching out for this one !

[Koresh]

@Sander-Teunissen Thanks for your attention to this project. There are Chinese national holidays until 8 october. So there are no updates now.

[jkandasa]

@Koresh This project looks super cool and very small. Thanks to the open hardware. Can you post SMPS transformer design specifications?

[jacikaas]

Hello, great project! I'm very intrested in it and waiting for testing results :)
One quick question: in this and also in other your profects with RFM69 you are don't using antenna for it. Is it not necessary, becose in introduction about radios (https://www.mysensors.org/build/connect_radio) there is note:
IMPORTANT: You MUST attach an antenna to the board. Aside from not working without an antenna, transmitters can be damaged if they transmit without an antenna present.
So does antenna for RFM69 is necessary?
Thanks!

[Koresh]

@jacikaas Thanks for your attention. Of course antenna is necessary, I use 17cm wire as antenna for all projects (so flexible antenna :))

Unfortunately I was extremely busy last months. I became a father :baby: and I had a rush job with my work projects :worried: . But I hope I will have a little more time. Now I am waiting for the boards for the first relatively large batch of all my projects. I am waiting for the large pack of components too :satisfied: Also I found a reliable pcba partner (I hope). So I really hope to introduce my boards (preassembled) for purchase soon.
Latest version of this board, for example looks as these screenshots:

I also have very interesting new modifications of this and other boards (it is secret for now :stuck_out_tongue_winking_eye: , but I will show it soon ).