# Wireless Transmitter

#### phoxes

Joined Dec 30, 2011
12
Hi -

Need a bit of help. I purchased a pre-built circuit from overseas that is supposed to be a 315MHz / 433.92MHz Wireless Transmitter Board Module. It's supposed to work with a relay receiver board that I purchased from the same company. Of course there is no manual with either, although I figured out the receiver relay, as it also works with standard garage door transmitters. The transmitter board has an antenna output, and 3 pins, labeled GROUND, VCC, DATA respectively. I was hoping that somehow all I would need to do is supply power to a pin on this transmitter, and it would transmit a signal to the relay receiver. Was I overly optimistic, or is this little board meant to be hooked up to some sort of controller? I hope I'm making sense.

Here is a link to the board I'm questioning if it helps. It has pictures and a few specs, but other than that doesn't say much.

http://www.dinodirect.com/315MHz-433-92MHz-Wireless-Transmitting-Board-Module-ZF-4.html?cur=AUD

Thank you in advance for any input, suggestion, help you can give.

Matt

#### Wendy

Joined Mar 24, 2008
22,326
The link you gave tripped our spam sensors, causing this post to be automatically moderated. I have approved it. Feel free to carry on.

#### praondevou

Joined Jul 9, 2011
2,942
What receiver module do you have?

This transmitter seems to be needing an encoder to be useful for anything.
Example:http://www.linxtechnologies.com/products/integrated-circuits/

Depending on the receiver u are using you might be able to detect that a carrier is being sent when you apply a HIGH signal to the data input of the transmitter. (It uses ASK)

However, you would detect that carrier for every transmitter that is used nearby.

#### phoxes

Joined Dec 30, 2011
12

#### praondevou

Joined Jul 9, 2011
2,942
What are you supposed to do with that without instructions??!!

The receiver responds either to a fixed code (which?) or has learning capability.

I would contact the manufacturer/distributor.

When I google "AK-RK01S" it usually comes with a transmitter.

#### phoxes

Joined Dec 30, 2011
12
Thanks again. I sent a message to the manufacturer, and I'll see if I ever get a reply. I did purchase a set with the transmitter. The transmitters are standard key-fob style. I was hoping I could get away with using the $2 transmitter board, and include it in my custom circuit instead of taking apart the key-fob and wiring it in directly. But these things are cheap enough (key-fob), I guess it wouldn't be that big of an inconvenience. #### praondevou Joined Jul 9, 2011 2,942 Thanks again. I sent a message to the manufacturer, and I'll see if I ever get a reply. I did purchase a set with the transmitter. The transmitters are standard key-fob style. I was hoping I could get away with using the$2 transmitter board, and include it in my custom circuit instead of taking apart the key-fob and wiring it in directly. But these things are cheap enough (key-fob), I guess it wouldn't be that big of an inconvenience.
Open the keyfob and try to find out what encoder they use.

#### phoxes

Joined Dec 30, 2011
12
Looks like a PT2264.

#### praondevou

Joined Jul 9, 2011
2,942
Looks like a PT2264.
Doesn't seem to be easily available around here.

It uses a fixed code so you would probably be able to replicate it with a small PIC (10f... or 12f...). Possibly also with other encoder chips but one would have to compare their datasheets meticulously to find a suitable one.
I guess that's too much work, right?

Probably so. I need to make about 40 units, and the key-fob looks like i can easily solder into the existing button switch. I think I can order the key-fob for ~$5 a piece so cost saving is negligible. I just haven't had any experience in this RF department so I really didn't know what I was getting into by looking at the$2 board. I was just 'hoping' it was a quick and cheap alternative to the key-fob. Thanks for all your help!