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No need to roll your own!
Posted by Rick Berube, Engineer on team #121, Rhode Warriors, from MiddleTown H.S. and Naval Undersea Warfare Center.
Posted on 3/15/99 4:32 PM MST In Reply to: Need info on how to build temp. receiver and transmitter posted by Paul Michalczuk on 3/10/99 7:21 PM MST: : Hi, : I was wondering if anyone out there knows how to make a transmitter and receiver so we could test out another robot with. Any help is appreciated. Thanks in advance. : Paul Michalczuk Paul, there's no need to roll your own RF reciever/transmitter! More than likely, all you need is a pair of cheap FM data modules. These are both readily available and cheap today (providing you operate in a resonably RF-benign area). Two sources come to mind immediately: AbaCom Technologies (http://www.abacom-tech.com) RadioMetrix (http://www.radiometrix.co.uk) I'm sure their are plenty of others as well. Because FIRST doesn't provide feedback (currently -although Eric Rasmusen did hint @Philly that he had some ideas for next year which might provide feedback), you really only need a Tx/Rx pair operating in a simplex mode. I'm sure these two source can answer your questions regarding their products better than I could. A few things are required however: You must ensure the power supply for the Rx unit is compatible with the robot (+5v or +13.5-12V)and that the noise rejection is reasonble. Also you must provide at least a 9600 baud rate. Any slower and you'll notice the difference. You'll also need to ensure an RS232 compatible interface. That's it in a nutshell. Good hunting, Rick |
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