$8 Lamp (Outlet) "Smart Plug" Module

[Moshe Livne]

@sundberg84 try the relay by itself first - connect to 5v and gnd and give it signal (even by just touching a wire to the signal leg). I had a run of several dead relays (was because of non rectified power supply so they switched on and off 50 times a second... one of the best ways to kill a relay I think)

[petewill]

@sundberg84 said:

Now the relay powers up, and i can switch (led turns on) but no click/coil activation so no 240v power out. Changed the relay but same result. I have 5v relay vcc and 5v on in but nothing... strange.

Wow, that is strange. I am using 5 or so different relays all around my house every day and I've never had this issues. I always connect them to 5v directly from the dc transformer (old cell phone chargers).

[Mohsin Hassan]

Hi,

any possibility of including a push button to manually trigger the switch on and off as well?
And if possible update Vera on the status change.

This way i can make it Wife safe and not get kicked out of the house...

I'm not good with coding but if someone can point me in the right direction please...

[sundberg84]

There is a scetch in mysensors lib doing this. Relayaccuatorwithbutton or something. Download the examplescetches and have a look: http://www.mysensors.org/build/relay#relaywithbuttonactuator-example @Mohsin-Hassan

[sundberg84]

@petewill @Moshe-Livne . Coil activates when i try with a 9v battery, so either bad/cheap relays or to weak power plug. All measures +5v but its not enough. Ill order some new relays.

[Moshe Livne]

@sundberg84 IMHO 9v will fry the relay. max voltage is 5.5v if my failing memory serves. depends on your relay, naturally but this is the most common one. have a look at the datasheet https://www.ghielectronics.com/downloads/man/20084141716341001RelayX1.pdf
yes it is 5.5v - nominal 5v, max current is 110%. I am sure it can sustain 6 but 9v will be really pushing it IMHO

[sundberg84]

It was only to test coil failure and see if it was a power issue :)

[Moshe Livne]

@sundberg84 A self fulfilling prophecy :-)

[petewill]

@Mohsin-Hassan said:

Hi,

any possibility of including a push button to manually trigger the switch on and off as well?
And if possible update Vera on the status change.

This way i can make it Wife safe and not get kicked out of the house...

I'm not good with coding but if someone can point me in the right direction please...

We are discussing this over here: http://forum.mysensors.org/topic/1607/safe-in-wall-ac-to-dc-transformers

You want to be careful you use the right transformer so you don't burn your house down. :) The wife probably wouldn't appreciate that.

I really want to do this too. I'm just waiting for the experts to weigh in on which transformer is safe.

[petewill]

@sundberg84 said:

@petewill @Moshe-Livne . Coil activates when i try with a 9v battery, so either bad/cheap relays or to weak power plug. All measures +5v but its not enough. Ill order some new relays.

So strange that it's not working. What is the power rating of your 5V transformer? Do you have a picture of your set up?

[sundberg84]

@petewill @Moshe-Livne

I dont reallt wants to admit it...
Well, I ordered the 5v relay from ebay (i have the reciept!) and looking at petewill video it says SRD-05VDC-
Looking at mine it says SRD-12VDC so probalby the sent me a 12v relay...

New one will arive soon i hope :) Thank you for the help and sorry for clogging the thread.

[Moshe Livne]

@sundberg84 that makes so much sense! And its not even your fault! :-)

[petewill]

@sundberg84 That's good news! Unfortunately you have to wait for new one but at least it's an easy fix!

[hyla]

@petewill
Just out of interest: how did You come up with the length for the antenna?
I remember vaguely that You can calculate the length if You know the
used frequency but You connect Your wire to an already existing PCB-Antenna...

Christoph

[petewill]

@hyla I actually recently did a separate video on how I do this with a little more explanation. If you're interested it's here:

https://youtu.be/NpMnauHeR7Y

In summary, I measured the length of the existing antenna on the PCB then added additional wire to get it up to the required length for the 2.4GHz range (4.92 in).

[hyla]

Thanx :)

Meanwhile I did some research too. The formula (as You all know :) ) is:
Lambda (m) = c(m/s) / f(1/s) with
c= 299711000 m/s
f= 2.400.000.000 hz

which comes down to 0.1248795833333333 m or roughly 4.92 in
The 1.64 in that are used on the PCB are actually Lambda/3.

Nicely done, Pete :)

C.

[sundberg84]

@petewill
Now i got three working relays thanks to you, so again, great video!
Wanted to thank you and also show my sollution.
I hade some 433mhz cheap (not good working) relays with perfect case i could re-use:
The case had a status-led and a switch i use as well.

[petewill]

@sundberg84 Cool! That's nice to have a case like that.

[m26872]

@sundberg84
Nice! That one deserves its own project thread. I think we're many interested in the details.

[Ivan Z]

This is may realisation