110v-230v AC to Mysensors PCB board

[Yveaux]

@toabhishekverma said:

change relay to match 3.3v like this http://vod.ebay.com/vod/FetchOrderDetails?qu=1&itemid=401045943120&transid=522355020027&viewpaymentstatus=

That's a link to your shopping cart, we don't have access to...
I'm interested in the relay, can you post a working link?

[toabhishekverma]

oops..

here is the link

http://www.ebay.com/itm/401045943120

[GertSanders]

I use the same SONGLE relays:

http://www.aliexpress.com/item/5pcs-SRD-03VDC-SL-C-3V-relay-5-feet-10A/32453591000.html

[toabhishekverma]

@GertSanders thanks for this link.
So do you have working prototype? what board are you using? I am in middle of finalising components and trying to finalise design. With little knowledge of electronics my progress is slow.
Also for 220 to 3.3v there is another converter from Olimex https://www.olimex.com/Products/Power/PWR-90-240V-3.3V0.8A/
overall its abit smaller then Hi-Link... Hi-Link abit better because all covered and less dangerous.

Please share if you have any design finalised.

[Yveaux]

@GertSanders @toabhishekverma Do you have the dimensions and/or holding resistance?

[toabhishekverma]

Sorry I didnt get your questions .. do you mean dimensions of 220-3.3v converter. Here they are.
output 2.5W 3.3V/0.8A +-0.2V size: 30x20x18mm

I am not from electronics background so didn't get what holding resistance means?

[Yveaux]

@toabhishekverma No, I meant for the relay ;-)
What's the resistance of the 3V coil? I want to know the current flowing when the relay is active.

[toabhishekverma]

@Yveaux Still no idea about it. Check link if you get something from it. what I know is it can bear up to 10A current and can be controlled using 3v .... my order still in shipping so don't know more then that.

[Yveaux]

@toabhishekverma Ah, ok. Didn't know they were still in transit.
Maybe @GertSanders has them 'on stock'?

[HenryWhite]

@Yveaux http://www.songle.com/en/pdf/20084141716341001.pdf

[Yveaux]

@HenryWhite Awesome! Didn't even think of looking for a datasheet of a Chinese relay ;-)

[Porky6666]

Another source :

50Pieces/Lot JRC-21F 4100 3V DC 6 Pins Miniature PCB Relay Brand New
http://s.aliexpress.com/MNVv2myE

[GertSanders]

@Yveaux No, also still waiting for the order to arrive. But a coil resistance of 20-25 Ohm means driving the coil with a FET. Not directly from a atmega328 pin.

[GertSanders]

@Porky6666 : only switches 3A, SONGLE relay can switch 10A.

[HenryWhite]

@GertSanders said:

@Yveaux No, also still waiting for the order to arrive. But a coil resistance of 20-25 Ohm means driving the coil with a FET. Not directly from a atmega328 pin.

Correct. Here's how I wired the songle relay on my Lithium Ion Sensor PCB:

@GertSanders said:

@Porky6666 : only switches 3A, SONGLE relay can switch 10A.

I wouldn't trust both of them when it comes to switching high amp devices over 3A. I think there is a reason no german electronics shop sells songle relays :smile:

Plus, relays from an electronics shop in your country might cost the same than the songle relays or will just be a tiny bit more expensive.

At least this is true for 5V relays. 3V relays are hard to find (at least in germany)

[GertSanders]

@HenryWhite said:

I wouldn't trust both of them when it comes to switching high amp devices over 3A.

I agree, I plan to switch lights, so my preference goes to the 10A model, just to be sure. I have used the SONGLE 5V versions, and none have ever given me reason to doubt their quality. Since I found a 3V3 powersupply I want to try building a full 3V3 board. Should be fun.

[toabhishekverma]

@HenryWhite why do we need D1 Diode (if i am write) in that circuit? do this circuit will not work without diode?
(sorry dont know much about electronics)

[HenryWhite]

@toabhishekverma https://en.m.wikipedia.org/wiki/Flyback_diode

in short: It is needed to protect the NPN transistor from damage.
The circuit will work without diode, But eventually damage the transistor.

[m26872]

@GertSanders Have you breadboarded your 3.3V design? I'm a bit worried that removing linear converter will impair the performance of the our fussy nRF clones due to less power supply ripple rejection. I think those going for the ESP8266 are better off.

[tomkxy]

Anyone has an idea where to source the 5.5V varistor? I received a bunch from AliExpress following which seem to be broken.
I found this link http://www.farnell.com/datasheets/575651.pdf. However, there seem to be a bunch of 5.5 V varistor. Can anybody help me figuring out the right ones?