Electronics > Microcontrollers

Cheap wireless interface for Pic/AVR?

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FenderBender:
Hello,

I'm working on designing a simple(ish) RC car and although I'm still in the planning stages, the one thing that really bugs me is the cost of some of these wireless modules. I know Xbee is pretty easy to use but it gets a bit pricey.  I remember taking apart an RC car once. I think it had some sort of cheap looking DIP Realtek chip, but now that I think of it... it also had some fancy RF circuitry that only dark magicians can understand.

Anyway, it doesn't have to be for Arduino or any of those in particular. I probably won't be using a dev board for the project.

But does anyone have any simple and cheap ways to do wireless? I guess a good range would be around 50m. I am fairly certain that Xbee is a one-way street, as in- transmitter and receiver. I was wondering if there is any module that can transmit and receive or use two separate ones if they are cheap enough.

Sorry for sounding like a newbie...because I am one, atleast to wireless.

Thanks.

FenderBender:
Anyone have experience with the Hope RF RFM12 transceiver modules? $7 bucks a pop on Sparkfun.

vxp036000:
It's really not that difficult to homebrew your own transmitter.  A simple Colpitt's oscillator and several amplifier stages work like a charm.  I'm using this architecture for an ASK transmitter as part of a wireless audio transmitter.


--- Quote from: FenderBender on April 25, 2012, 11:03:41 pm ---Hello,

I'm working on designing a simple(ish) RC car and although I'm still in the planning stages, the one thing that really bugs me is the cost of some of these wireless modules. I know Xbee is pretty easy to use but it gets a bit pricey.  I remember taking apart an RC car once. I think it had some sort of cheap looking DIP Realtek chip, but now that I think of it... it also had some fancy RF circuitry that only dark magicians can understand.

Anyway, it doesn't have to be for Arduino or any of those in particular. I probably won't be using a dev board for the project.

But does anyone have any simple and cheap ways to do wireless? I guess a good range would be around 50m. I am fairly certain that Xbee is a one-way street, as in- transmitter and receiver. I was wondering if there is any module that can transmit and receive or use two separate ones if they are cheap enough.

Sorry for sounding like a newbie...because I am one, atleast to wireless.

Thanks.

--- End quote ---

benemorius:

--- Quote from: FenderBender on April 25, 2012, 11:32:27 pm ---Anyone have experience with the Hope RF RFM12 transceiver modules? $7 bucks a pop on Sparkfun.

--- End quote ---

I was about to recommend exactly that. I haven't done anything with it beyond checking to see that it would work well with my car alarm transceiver. It's cheap and pretty versatile. For $7 bucks a pop I'd say give it a go if it means getting your project off the ground sooner. They come configured for 433MHz which is ideal for attempting a 50m link without continuous line of sight.

FenderBender:

--- Quote from: vxp036000 on April 25, 2012, 11:50:07 pm ---It's really not that difficult to homebrew your own transmitter.  A simple Colpitt's oscillator and several amplifier stages work like a charm.  I'm using this architecture for an ASK transmitter as part of a wireless audio transmitter.

--- End quote ---

Would this work for digital transmission? It would seem that it might work fine with analog, just not sure of reliability with digital packets.

Am I wrong about this? I definitely could be.

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