💬 Wall Socket Insertable Node

[yury]

Hi @fisher yes this is Koresh board. Hope to upload others soon... We did production and testing with him together.

[DavidZH]

@Koresh I'd like to repeat the question @MiKa asked on Januari 10th; can you share details on the transformer you used? Or a hint on where you got the inspiration for the power supply for the board?

[Koresh]

@DavidZH Sorry for such long delay with this question. I will try to explain it carefully now.
I think it is not possible to buy ready transformer on ali or anywhere else. You can only derive it yourself according to your schematic and produce it at any factory according to your requirements.
This board has flyback power supply so you can use any flyback transformer design guide, or use as similar as possible reference design. I used EBC10010 reference design to produce the required transformer.
The main difficulty is the difference between theoretical transformers and produced transformers, so we should tune our schematic to produced transformer a little. Now I have a small batch of transformers almost all of which are soldered on the boards. When I place an order for the next batch of transformers (may be a larger one), I can who send it to anyone who is interested (of course with a tuned schematic if the next batch is different).

[DavidZH]

@Koresh Thanks for the explanation.

I've been searching for a power solution for my nodes. And that's quite the task.... For now I'm working with the HLK, but that's a tight squeeze. And when I want to make a dimmer, I could use a zero cross circuit. I've been looking into Vigortronix, who have a supply similar to the HLK, but with an extra pulse output for the zero-X. Too bad they are WIDE. They won't leave any proper room for a relay or connection terminal.
I'll take a look at your link and see if I can make that work in my case, and may come back to you for some magnetics.

[Koresh]

Unfortunately I can't open my ebay shop right now. While I'm trying to open it, you can buy this board here: https://www.ebid.net/eu/for-sale/arduino-ide-compatible-low-profile-220v-10a-relay-rfm69hw-433-mhz-radio-156694939.htm

[jeremushka]

in case you want to use the wall plug manually when a device is connected (without mysensors), it will not work at all in case the relay has been switched ? How do you manage external usage ?

[yury]

@jeremushka

Assume you need to use it with some kind of momentary or rocker switch in case you lose connection to the gateway. Use JST connector and enable A2 internall pullup. JST connector pins are A2 and ground.

[jeremushka]

@yury i have built a system quite simular but still big mess in the connections. However, i am trying to have a detection when an equipment is plugged in into the wall plug to automatically activate the relay?
You may ask why? Simple reason. At home my wife doesnt use the automation system. If she plug in a device (charger, coffee machine, etc, it should work automatically without to have to switch the node via the mysensors controller. Normal usage of the plug should in my case be working.

[kalina]

@jeremushka In my opinion you should have two modes - automatic (with mysensors) and manualy (without). In manualy case the wall plug must be always under the voltage and you don't need detect plug a device. But how are you going to switch mode - this is a question...

[Koresh]

@kalina said in 💬 Wall Socket Insertable Node:

But how are you going to switch mode - this is a question...

Long button pressure for example :)

[jeremushka]

@kalina agree with you. By pressing a button in that case better not to insert the system in the wall. To get outside plug. Something like the fibaro plug which is working with these two modes.

[yury]

make sense?

sketch is here
https://github.com/EasySensors/WallSocketInsertableNode/blob/master/WallSocketInsertableNode.ino

but no LED support there, but easy to add.
Yes, it will work if no gateway around.

[jeremushka]

@yury Yes, this is perfect :) Great job !!!

Have you ever had feature as power meter?

[yury]

@jeremushka said in 💬 Wall Socket Insertable Node:

Have you ever had feature as power meter?

there is ACS712ELCTR-20A AC current sensing chip on the board. but Atmega ADC not very accurate at low currents reported from ACS712 - 20A. 15W loads or less can be difficult to recognize.

BTW another idea for LED indication . There is installed pixel LED on-board. check pictures. it is bright enough

[kalina]

@yury What do you think about capacitive button "On/Off" to the right corner from led? Look at the pic below...

[jeremushka]

@yury said in 💬 Wall Socket Insertable Node:

ACS712ELCTR-20A AC current

That will be great! for the current sensor, i am trying to check accurancy with another component HLW8012, it is used by Xiaomi as well. I don't know if it is good or not yet.

[Koresh]

@jeremushka said in 💬 Wall Socket Insertable Node:

HLW8012

Very interesting solution. Except for one thing... According to HLW8012 appnote we need additional 5V power supply if we want to implement safety isolation between low voltage arduino circuit and high voltage circuit.

[jeremushka]

@Koresh could we reuse the 5V DC at the output of the transformer ? We have the isolation at this point. and the current will be enough for the the circuit.

[Koresh]

@jeremushka Sorry but I don't understand... In current version of board ACS712 uses 5v DC from the transformer, but ACS output and power circuit are isolated from measure circuit. HLW8012 outputs and power are not isolated from measure circuit, so we should use circuit like this:

And of cource we need additional power supply.

[yury]

@kalina said in 💬 Wall Socket Insertable Node:

@yury What do you think about capacitive button "On/Off" to the right corner from led? Look at the pic below...

Looks cool! Do you have experience with capacities switches? I did not play much with them. afraid to use close to AC interference though...