Shop OBEX P1 Docs P2 Docs Learn Events
Project: Any Transmitter/ Receiver recommends — Parallax Forums

Project: Any Transmitter/ Receiver recommends

New1976New1976 Posts: 18
edited 2005-06-22 12:24 in General Discussion
Hi Sir,

I'm currently doing my personal project. I'm trying to search for a kind of Transmitter/ Receiver··device.

Follows are my requirement for this device:
1. Transmit Range up to 50 feets.
2.·For·download the PBasic Code·from PC·into·microcontroller.
3. Best Price.

Appreciate your help

Regards,
New1976

Comments

  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-06-21 14:51
    I am assuming your requirement #2 is that you want existing PBASIC interface code. Your #2 and #3 requirements are at odds with each other. If you want a sample program written in PBASIC you should get one of Parallax's RF modules. But these are not the cheapest on the market, www.sparkfun.com has cheaper modules but you don't get PBASIC code or the assistance with writting or modifying PBASIC code (sparkfun's customer service is top notch but they don't assist in software interfacing with thier products). So its up to you what is more important, cheap with limited techincal assistance, or a little more money and get the assistance from Parallax and members on the forum.
  • New1976New1976 Posts: 18
    edited 2005-06-21 15:50
    HI Sir,

    Thanks for prompt responds.

    I have actually has·doubt on·how to·choose the right RF modules for my personal project. I have two RF modules in minds as shown below:

    1. 0169-Par-YES Wireless TxRx Qty 2

    2. PX27987 433 MHz RF Module·Receiver· 1 unit···
    ··· PX27986 433 MHz RF Module Transmitter· 1 unit

    I basically need a RF module to replace the serial cable. The downloading of the Pbasic code will be done on the computer screen. In order words, there is no cable connection·between computer to the board.

    So can·anyone give me a·suggestion on which RF modules to choose as stated above.

    Appreciate your advise.

    Regards,
    New1976·
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-06-21 16:53
    Hello,

    ·· I am not aware of an RF module which, as packaged will do what you require.· Programming of the Stamp requires the DTR line to be available, as well as the device being able to duplicate the "break" condition, also required to program a Stamp Module.· There are very strict timing requirements, which can be found in our tokenizer library documentation on our website.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-06-21 17:21
    Ok now I have a better understanding of what you are trying to do. This suggestion is somewhat a stab in the dark, but perhaps it will point you in the right direction.

    A new wireless standard called wireless USB (wUSB) is coming out on the market, in theory it communicates USB data wirelessly. So if you have a USB based Stamp board, you could theoretically use two wireless USB modules to communicate between your stamp and PC. But here is the major caveat: I have not studied the details of wUSB, therefore I do not know if wUSB is 100% compatible with standard USB. Also as Chris mentions there are strict timing requirements, droping a wUSB link in the mix will most certainly increase the latency of the signal (the time it takes for the data to travel from the PC to the stamp (and back to the PC)) which may cause the Stamp IDE's failure to properly recognize the stamp. So before deciding on this route, extensively study wUSB specs paying particular attention to compatability with standard USB and the time it takes for USB data entering the wireless link to exit the wireless link on the destination module. This would require you finding out what the timing requirements are for programming the stamp to ensure that adding the wireless portion won't foul the timing up.
  • New1976New1976 Posts: 18
    edited 2005-06-22 01:36
    Hi Sir,

    Thanks for your advise.

    I'm using a Boe Bot Robot Kit and the board i'm using now is in Serial port rather than USB. As for the USB(wireless) is the product available now in market? Cos i have deadline to do implements this into my project.

    If USB(wireless) is not available for the time being. I would to use the RF module. So is a advisable to use the RF module to act as a wireless.

    The most important i want to achieve for this project is that, I want to replace the Serial programming Cable into some wireless devices. With this i can perform a PBasic code downloading to the Basic stamp from the computer without using the cable.

    Regards,

    New1976
  • KB3JJGKB3JJG Posts: 95
    edited 2005-06-22 12:24
    Th E-Wave stamper will do what you want, although it's far from an inexpensive solution $350 or so for an eval kit. It will however work for programming the stamp via wireless!

    http://www.electrowave.com/products/stamper.shtml

    ·
Sign In or Register to comment.