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Topic: Wireless Rocket Motor Testing (Read 991 times) previous topic - next topic

rpmaurer

Should be fairly simple: PC Software wirelessly sends a firing command to an Arduino UNO via a wireless chip, Arduino trips a relay to ignite the motor (ignition requires a 12v car battery), load cell provides an analog voltage signal into Arduino, Arduino sends signal to PC via wireless chip, PC records voltage and converts it into thrust. 

Now, I am good with the software (doing this through VB.net and its SerialPort app)... the question is, which wireless method should I go through?  Wifly seems cheap but I cant find and programming help for the life of me.  Xbee seems confusing, which do I buy?  Will it extend 50-100m?  Can I still run the Xbee through VB.net using it as a serial port?  Im good with the Arduino board, and VB.net; new to wireless communications :)

All help is appreciated, thanks a bunch!

Ryan

Nick Gammon

I used an el-cheapo radio transmitter/receiver to control a car. Might be all you need. Details here:

http://www.gammon.com.au/forum/?id=11506
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

PeterH

I don't know which technique you're going to use, but on the controlling side I suggest you design it so that you can validate the command before you act on it - it would be all too easy for random noise to trigger your motor prematurely, and I imagine that would be a very bad thing.
I only provide help via the forum - please do not contact me for private consultancy.

kg4wsv

Look at your data bandwidth  - you may very well find that you will fail to record important events because the wireless data speed will not allow you to sample fast enough.

-j

Nick Gammon

I thought he just wanted to trigger an ignition sequence. And for that, yes I would send a fairly lengthy sequence so that noise doesn't set the thing off.
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

rpmaurer

Mark,
I would like to have the Arduino send voltage data as fast as possible, then have my software on the computer pick it up (30+ a sec).  Also what is the range, and is this a "transparent" radio?  Can it just be programmed as a serial port?  I like the Ciseco XRF and URF, but alas they are only sold in Europe :(

kg4wsv

Quote
I thought he just wanted to trigger an ignition sequence.


Nope, looks like he's building a test stand:

Quote
load cell provides an analog voltage signal into Arduino, Arduino sends signal to PC via wireless chip, PC records voltage and converts it into thrust.


-j

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