💬 In Wall AC/DC Pcb (with Relay) for MySensors (SMD)

[proddy]

@sundberg84 Thanks for sharing this. I'm gathering the components and plan to build it soon when the PCB v7.1 is available.

I do have a few questions if I may

• with the Relay, is it important to have one that has zero crossover? E.g the difference between getting the G3MC-202PL over a G3MC-202P
• what were you planning to use the 16Mhz oscillator for eventually?
• do you see any issues if I build the first prototype using an ESP-12 (ESP8266 with onboard Serial WiFi running at 3.3v)?

[sundberg84]

@Paul-Derbyshire

1. It must depend on what you are planning to connect to the relay
2. The oscillator is for the MCU - you can program a bootloader without it and use the internal.
3. No issue - please do! Im glad i can make stuff that gets the community forward. Best of luck!

[proddy]

@sundberg84 said:

It must depend on what you are planning to connect to the relay

It would use it to switch on and off an external mounted lamp - so with a fixed Watt & Voltage. Probably an LED 220V Lamp. Should I avoid zero-crossover as I've read somewhere that zero-crossover can cause a surge current of perhaps 10 to 40 times the steady state current when switched on.

[sundberg84]

@Paul-Derbyshire - sorry, to be hones i missunderstood you.
Most SSR sold for arduino are P and not PL it seems.

"The light from the diode is beamed into a light-sensitive semiconductor that, in the case of zero-voltage crossover relays, conditions the control circuit to turn on the output solid-state switch at the next zero-voltage crossover. In the case of nonzero-voltage crossover relays, the output solid-state switch is turned on at the precise voltage occurring at the time."

[Jose Simoes]

hi, just an idea, do you think it is possible to add a current sensor to the PCB in order to add a power meter function to the node to monitor power consumption? say up to 20A

[sundberg84]

@Jose-Simoes - no clue about current sensors... sorry I just cant answer that at the moment.

[Jose Simoes]

This post is deleted!

[Jose Simoes]

@sundberg84 -hey, i was meaning something like the ACS712 Module, but add the ic to the PCB for better integration.

[sundberg84]

@Jose-Simoes said in 💬 In Wall AC/DC Pcb (with Relay) for MySensors (SMD):

ACS712

Well, to safe space and meet my goal to be able to have it so small so it fits inside a wallsocket i have excluded all sensors and included the MysX connector. This way every user can add their own sensor.

[Justas]

Hi, @sundberg84
I'm really interested in this module. Maybe stupid question, but I'm very new with openhardware and would like to understand: if I will go and buy through the link provided (10xPCB for 15$), will I receive already assembled unit with all the parts, or I have to go and buy parts and assemble it myself?
Thanks & Regards

[tonnerre33]

@Justas Hello,

yes you have to buy parts and assemble them yourself. 1.5$ by PCB is cheap, you can't have the components for this price ;)

[gohan]

@Justas
you get the PCB only, then you have to buy all the components and solder them on the pcb :)
If you aren't a lot familiar with soldering you could also evaluate Sonoff wifi relays ;)

[Justas]

Thanks, I also checked the parts list and found that total price is more than $14, so now I see how stupid my questions was ;)

[proddy]

and building it is 99% of the fun !

[hugch]

Very nice project. And it is so nice that you thought about the fuses for the power supply and the relais. :-)
I have two additional ideas:

• adding the ATSHA204 fo secure signing
• I could be to big to integrate but something like this (https://www.aliexpress.com/item/1Bit-AC-220V-Optocoupler-Isolation-Module-Testing-Board-Adaptive-for-PLC/32754734564.html) would be great to detect the in wall switch state.

[exilit]

Great project, thank you for sharing. Searching for a power supply i found your project which seems to fit my needs pretty well. What do you think are the main differences to the AC/DC/Double SSD Relay by Aproxx (https://www.mysensors.org/hardware/ac-dc-ssd-relay). I am mainly interested in the AC/DC conversion part.Would like to hear your opinion on that.

[sundberg84]

@exilit - sorry my friend, I have not studied the AC/DC/Double SSD Relay by Aproxx very closely.
Mine is a bit smaller instead of 50x50 but he got 2 relays.

[exilit]

@sundberg84 Thank you for your reply. Do you see big differences regarding the safety?
As far as I see both projects use a slow blow fuse and a thermal fuse to protect the AC-side.

Sorry for digging deeper, but both projects look great. Yours seems to be better tested,
but the other one has two relays. Hard to decide, which one to use :-).

[sundberg84]

@exilit - I think we both origin from the original discussion about the HLK-PM01: https://forum.mysensors.org/topic/1607/safe-in-wall-ac-to-dc-transformers.
If you read this you can pretty much see everything in the PCB (fuses, varistor and temp fuse to protect the HLK module).

[Martin Nicolaisen]

Hi @sundberg84 does it fit the fuga (scandinavian) wall socket? :=