Suggestions for Rx/Tx Module with 20m Range approx.

Hi,

I would like to send two variables from one PICAXE (attached to two variable resistors) to another using wireless modules. The PICAXE receiving the variables will be using them to adjust the speed of a motors (via PWM) attached to a dual motor gearbox - allowing independent control of the left and right wheels (it is the item found here: http://www.littlebirdelectronics.com/products/Tamiya-89915-Twin%2dMotor-Gearbox-Kit-%2d-Clear.html).

Anyway, I know what to do with the PICAXE code side of things, however, am not really sure about what wireless module to choose. I am planning to use an 08M/14M (ADC-->Tx) and 28X1 (Rx -->PWM) for this.

Are the ones that are mentioned at the link below reliable enough to use with moving objects? Hopefully someone here has used them. The unit the gearbox will be used in will be moving no more than about 5-10 kilometers per hour (I personally think they should be okay).
http://www.picaxe.orconhosting.net.nz/txrx433.jpg

They are only $10 AUD each from Jaycar Electronics. I am only after something 10-20m range max - I don't want to use infrared. And I only need a Rx module and Tx module - not one with both (I think called a transceiver).

There are also some cheap modules on eBay:
Tx: http://cgi.ebay.com.au/1000m-RF-Wireless-Radio-Transmitting-Module-TM1000-1_W0QQitemZ290368703543QQcmdZViewItemQQptZRadio_Control_Vehicles?hash=item439b52cc37
Rx: http://cgi.ebay.com.au/Wireless-Radio-Superheterodyne-Receiver-Module-RM1SH_W0QQitemZ300365598720QQcmdZViewItemQQptZGarage_Doors_Openers?hash=item45ef2f5000

If any one has anymore ideas, I'd be interested to know. I don't want to spend more than about $30 AUD on this.

Thanks for your help in advance.

Dannydig: Bravo on a lucid posting. That range need of 10-20 metres suits the reliable & easily driven Jaycar Keymark/Spirit-On Tx/Rx pair well. Jaycar have rather pushed up their prices ( my fault perhaps!) but suggest you start with them anyway. Stan

I'll second manuka's comments. Follow the recipe on his website and it will work fine. Range is up to about 100 metres so 20 metres will be easily ok.

It only gets complicated once you have more than one Tx on the same frequency and you want to do packet routing and file transfer. Which you don't need.

Picaxe plus those cheap and cheerful modules is a breeze.

Hi Dannydig,

Here is where I get my wireless gear: http://www.sparkfun.com/commerce/categories.php?c=79...don't know if that will help you or not, but another place to look.

Implementing what you're speaking about sounds pretty easy...there's lots of info on this forum about RF communication...I did a lot of reading, and implemented my own (albeit stationary) RF communication solution that is working rock-solid right now...I think you'll have fun working on your project!

Brendan

manuka said:

Dannydig: Bravo on a lucid posting. That range need of 10-20 metres suits the reliable & easily driven Jaycar Keymark/Spirit-On Tx/Rx pair well. Jaycar have rather pushed up their prices ( my fault perhaps!) but suggest you start with them anyway. Stan

Click to expand...

Thanks Stan,

It looks like surplustronics sell the same ASK RFC1/RFD1 modules for $5 that jaycar sell for $15. Their FSK pair are $10/15 respectively.