TSOP48 microprocessor

Discussion in 'The Projects Forum' started by kja00, Oct 14, 2009.

  1. kja00

    Thread Starter New Member

    Oct 14, 2009
    10
    0
    Hello

    I am doing a project where i want to connect a microprocessor to my DVD player. The goal is to turn on the DVD player, eject tray etc. without using the remote control, but by programming the microprocessor to do so. I have taken the DVD player apart and located the IR reciever [ TSOP4836ZC1 - datasheet http://www.vishay.com/doc?82090 ]. I want to connect a wire from the microprocessor to pin 1 [OUT] on the IR reciver and create the same signal as if you press a button on the remote control, but this seems to be quit troublesome.

    I have connected ground from my oscilloscope to pin 2 [GND] on the IR reciver and the probe is connected to pin 1 [OUT], when i do not press any buttons on the remote control pin 1 [OUT] is high +5V, if i press "Eject Tray" a square signal is generated. My problem is how can i get pin 1 [OUT] to drop to 0V to be able to generate the square signal with the microprocessor?

    When i first go the idea to this project i thought that pin 1 [OUT] would be 0V when no buttons where pressed, because then it would be quite easy to genereate the signal with the micropressor.

    I anyone has ideas, suggestions etc. to get me back on track i would really appreciate it.

    Thanks
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
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    Why cant you just logically invert the data going to the microprocessor port pin? Are you asking how to "Wire OR" the signal at pin 1 of the IR receiver with a port pin on the uP, so that either device could pull the data line low? That can be done with some simple diode logic.

    How about connecting pin 1 of the IR receiver to an input pin on the uP, doing the "OR-ing" in software, and connecting the output pin of the uP to where the wire goes into the guts of the player?
     
    Last edited: Oct 14, 2009
  3. kja00

    Thread Starter New Member

    Oct 14, 2009
    10
    0
    Thanks for your answer

    Yes, what i want to get suggestions on is how to wire a port pin on the processor to the IR reciever so both the microprocessor and the IR reciever itself can pull the output pin on the IR reciver low, because then i will be able to generate the same signal on pin 1 of the IR reciver with the microprocessor as if i had pressed a button on the remote control.

    But i have a hard time figuring out how i would be able influence pin 1 [out] on the IR reciver with something external, when i press a button on the remote control and pin 1 goes low some logic inside the epoxy package must be activated, but how can i accomplish this "from the outside"?
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    All it takes is three parts; a resistor and two small-signal diodes. Note that both the output from the IR receiver and from the uP port-pin are ACTIVE-LOW signals.

    You might be interested in this, too.
     
    Last edited: Oct 14, 2009
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