💬 RFM69 Livolo 2 channels 1 way EU switch(VL-C700X-1 Ver: B8)

[mtiutiu]

@MiKa

That device is rated at 16V max input voltage...I won't use that because the input varies from 12 to 14V approx. So it's like living on the edge. Why are people afraid of including a DC-DC converter into their design when high voltage drops are involved and a little bit more output current is required - actually we can speak in terms of power here as it's more appropriate. So we all know that when it comes to more power a DC-DC converter is more efficient than a classic LDO. Is it because of noise? That can be filtered not a problem and reduced to an acceptable level. In terms of volume - indeed there are more components involved and a little bit more care is needed when designing the PCB but hey we need to make some compromise in the end...and I for example like to stay on the safe side on the long term.

[alexus]

Is there a connection example with ESP?

[mtiutiu]

@alexus

Hi, I don't know of any. There was @DJONvl who claims that he did it on this thread: https://forum.mysensors.org/topic/2775/livolo-glass-panel-touch-light-wall-switch-arduino-433mhz/75. But it didn't got my attention as ESP or any WiFi module is too power hungry for this project where simple sensors/actuators are involved and very light in terms of power usage(including radio transport). But as I said this is only my personal preference.

[mtiutiu]

@tonnerre33

Nice work regarding Kicad. You'll see that on the long term it's a real benefit to switch to Kicad and I strongly adhere to it even though some people would say the contrary. It is indeed a little bit hard maybe to start with it and the learning curve is not the easiest one but after you master it then it will be a joy to work with. And more features/bug fixes are made as we speak because it's a very active developed project now. And on top of that that it's FREE - no limitations or whatsoever.

[shabba]

I got my PCBs today in the post. Is there a way to hack them to work with new circuit or should I just bin them?

[mtiutiu]

@shabba

Until I get my hands on the new switches I cannot say. The thing is that they use now a 2x7 connector instead of a 2x6 one. I don't know how the relays are mapped to the new one and the 3V line. But I think that for sure a new pcb needs to be created. But until then maybe @tonnerre33 can shed some light here with some pictures? Is the new connector mapped ok in your schematics?

If I see well in the pictures they moved the connector in the opposite direction so yeah...a new pcb design is needed.

And to be honest I cannot keep up with the Lenovo manufacturer and create every time a new pcb because they maybe didn't slept very well over night and decided to change hw revision of the power/relays board on which this project relies. This is overkill and it's a downside for this project as I need to rely on their power supply board.

Now as I promised I will create a new pcb for the new hw revision but ONLY for that and not the future ones. The new hw revision that they use now is the one that @tonnerre33 and @shabba has which is: VL-C702X-2 VER:C1

But @shabba there's @tonnerre33 who works on this and started ahead of me so maybe you two can sync up on this?

[alexus]

@mtiutiu Very much I ask, prompt as to connect esp-01 instead of RFM

[mtiutiu]

@alexus

Creating a new board with new hardware/new stuff like the ESP-01 is a thing that requires time and testing which is a luxury that I really don't have now. So I'm sorry but I won't invest time/money in creating/testing boards with ESP modules. The only thing that I'm going to do is to re-design the RFM board only as it doesn't require too much changes/work/time/money and it was tested beforehand.

[alexus]

@mtiutiu I'm not asking you to design the board again. If you can tell how to connect the ESP module to your board?

thanks for the advice

[tonnerre33]

@mtiutiu Yes the new connector is mapped for the new version. I have checked the pins with the multimeter.

I have done many picture that you can see here :

http://www.photorapide.com/albums/jordan/kqadrk/livolo-vl-c702x-2-ver-c1.html

I hope you will find the informations that you want.

Caution if you look my schema for see the mapping of the pin because on my board the bottom is your top and the top your bottom ;)

Edit : I have added the mapping in the picture album

Did you know why the pin in red surrounded is connected to the VIN ?

[mtiutiu]

@alexus

Ok...my bad. I didn't understand your initial question. But now the next question is: what do you want to accomplish exactly? Can you be more specific?

[mtiutiu]

@tonnerre33

Thanks for the pics and for your time. Well that's how the SOT-89 package is designed. If I'm not mistaking the big metallic pad was made like that for better thermal dissipation if you make the copper area which it connects to big enough. Now why it was specifically connected to Vin...that I'm afraid I don't know.

[alexus]

@mtiutiu I ask you to help me connect ESP-01 to your board

[bjornhallberg]

Just want to confirm that I also received a "VL-C702X-2 VER:C1" today in the mail so at least they haven't made yet another version.

[tonnerre33]

Hello @mtiutiu i think i have finished my first version.
I have modified the pcb with your suggestions (power the node with 12VCC).
I have corrected a big mistake too, the AT25DF512C footprint was wrong (convertor mistake i think) ...

I have to put 2 resistors on the prohibided face ^^ but normaly it should be ok

[shabba]

So besides the header being bigger what else has changed? I have received the current PCBs and wondering what I might need to do to make them still work?

[tonnerre33]

@shabba said in 💬 Livolo 2 channels 1 way EU switch(VL-C700X-1 Ver: B8):

The position of the header has changed too. Now it's on the right part.
I think you can use your pcb but you'll need some wires between the femal header and the new mal header.

[shabba]

@tonnerre33 Thanks - do you happen to know the pin out?

[tonnerre33]

Yes, you can find the new pint out here :

http://www.photorapide.com/images.php?photoName=dm0l6i.jpg&photoId=1002306

[shabba]

@tonnerre33 Thanks! Do you know the old one?