how to connect?

Discussion in 'The Projects Forum' started by ecjohnny, Oct 4, 2008.

  1. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    Here is the datasheet of the product http://www.farnell.com/datasheets/90326.pdf

    Model:
    Transmitter = RTFQ1
    Receiver = RRFQ1

    Frequency = 433.92MHz


    I am about to purchase this but i have problem understanding the pins.
    Basically, what i want to do is connect up a push button switch to the transmitter. As the button is press, of course the receiver detects it and send a signal to one of my pin in a USBio port connected to my laptop.

    How is the connection like at the transmitter side and receiver side?

    This is my first time using this thing. Any brief diagram/drawings will help.

    Thanks a bunch!!!

    Also in addition , i would like to know if an antenna determine the range of RF. if so, i change my transmitter antenna to a higher dB gain would the range increase? or do i also have to change the receiver antenna too?
     
    Last edited: Oct 4, 2008
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you go to the last page of the datasheet it gives you a wiring diagram, according to it you can make your modifications.
     
  3. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    thanks...But i need some to advice me on this :
    Basically i am trying to design a wireless system to be used in a hotel room. whereby a guest can push a button(transmitter) and it is send into a receiver which lit up an LED. So i will have a big hotel(map) display board with LEDs representing the rooms.

    Problem: Only one frequency how can i differential which guest is from which from? address?

    Do i actually need to have 100+ different transmitter and 100 + receiver of 100+ different frequency? for 100+ rooms?


    Can i have many transmitters (rooms) of same frequency and only one receiver to identify the respective rooms?

    Any suggestion i can do this ? preferably i can make one myself?

    Thanks
     
    Last edited: Oct 6, 2008
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You only need one frequency for all the small transmitters, but each one has to transmit a unique sequence of tones/bits to be identified properly.
     
  5. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    how can i do it? i just found some info on google about relay and dip switches. And some RF triggers. But i cant find a schematic diagram for it.

    Anyway, what is the easiest way?
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Think garage door opener, they send a binary code by keying the transmitter on and off. I'm getting the strong feeling that you want a ready made off the shelf solution on this though. How technical are you?
     
  7. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    No.. actually i am trying to make one. but i dont know where to start.
    From previous post : "preferably i can make one myself?"

    Is it easy to built one? anyone link me to a schematic diagram or teach me how to make one?
     
  8. ecjohnny

    Thread Starter Senior Member

    Jul 16, 2005
    142
    0
    Anyone? actually i am fine with same number of Tx and Rx . But i have been searching online to learn how i can make one with no luck. Only thing i know is the theory behind it.

    i found a wireless door bell with coding. But the to use the receiver(chime) i need to plug it into my power socket (3 pin) which is about 200V+ AC. How can i remove the 3 pin and modify it to produce a 5V DC or 12V AC ?? is it possible?



    my project will be due soon and i guess i have to leave this feature out :(
     
    Last edited: Oct 7, 2008
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