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  1. mikezang

    How to use 0-9v to simulate 4 switches?

    How much about total cost about your suggestion? Then I want to use RCX output to control Uno, is it possible? For example, when RCX sensor find a object, RCX will let Uno to play sound a while then stop, and son.
  2. mikezang

    How to use 0-9v to simulate 4 switches?

    Like you guessed, I want to use a RCX output port to simulate TG1-TG4. It is said the LM3914 is a possible choice, can you show me a sample circuit with LM3914?
  3. mikezang

    How to use 0-9v to simulate 4 switches?

    >Check out this article about controlling a fan with an RCX. Your TG1-4 inputs will be similar. >http://homepages.udayton.edu/~hardierc/EGR101/RCX%... I am a software engineer, I am not sure how to extend one SW to four SWs, can you show me a simple circuit?
  4. mikezang

    How to use 0-9v to simulate 4 switches?

    I think that 3v power supplier is not key point, I can provide it without problems. I want to know how to simulate 4 SWs when I change output voltage. Then I have about 10 RCXs and I need to use them.
  5. mikezang

    How to use 0-9v to simulate 4 switches?

    Can you show me a simple sample circuit?
  6. mikezang

    How to use 0-9v to simulate 4 switches?

    Thanks for your reply. In fact, that circuit is a train sound generator for train model, I want to use Lego RCX or PF to control that 4 switches, so that if I set RCX/PF output to 1v, SW1 is on and sound1 on, set output to 2v so SW2 is on and sound2 on, and so on, when set output to 0v, all SWs...
  7. mikezang

    How to use 0-9v to simulate 4 switches?

    I am a circuit as attachment, I want to use output 0-9v signal to simulate 4 SWs, what can I do? Then if my power is 9v, how can I use it for this 3v circuit?

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