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.
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?
>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?
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.
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...
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?
