💬 Wall Socket Insertable Node

[Koresh]

@skatun said:

@Koresh
Check out this interesting topic on accursy for power measurement:
Greg

Do you have data on the inbuilt temperature sensor?

Frankly speaking I had added current sensor last night before test board production and I had no goal to measure power very accurate. The main goal of this sensor is ability to check fact of load (forget iron for example :)). Of course I can improve it in further versions, but it is not the main feature now.

I tested this temperature sensor and it works fine. I'am not sure mysensors library supports it. If it doesn't support it I will try to add this ability after hardware testing.

[skatun]

@Koresh Ok, I am looking forward to hear how your board turns out. So what I am looking for is something to replace this temperature controller. I was thinking about using esp8266 wifi chip instead of the radio, since power is not a big issue since its connected to the power line. Then people like my parents can use it with IFTTT and do not have to add a gateway. I was also thinking about adding a connector for a nextion display, just in case you want to display the temperature, use it as input to set temperature etc. It should also have a better temperature and humidity chip then the one inbuilt I think. Screw terminal to connect floor temperature sensor. Measure power accurately. Well if you would like to cooperate on version2 of your board let me know. I would like to make 20 units or so for now.

[Koresh]

I'm having first success with this board. Power supply works!

[Yveaux]

@Koresh great work! You can still make July 30th :bowtie: no pressure :neckbeard:

[Koresh]

And some photos after soldering of the main components and slight washing.

Relay trick :)

[Sander Teunissen]

Hi Koresh. Interesting project ! Are you planning to sell some assembled parts too ?

[Sander Teunissen]

I just bumped into these too:
https://www.openhardware.io/view/102/Wall-Switch-Insertable-Node#tabs-instructions
So interesting ! will these be sold too ?

[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: