Hi, a few months back I posted about a crackpot plan I had to install a kind of laser harp in my house by shining a dozen lasers into light sensitive switches, which in turn were connected to the switches on a cheap MIDI keyboard (non-velocity sensitive), to provide the MIDI out, and then on to a decent sound module. You guys gave me some good advice back then, but I've only just got to the point of trying it.
I bought these two items:
Then I soldered it all together and tried it. I'm shining the laser onto the LDR from over a metre away and... it works!
Well sorta.. the problem is with the switch implementing a "delay circuit to avoid cycling", which I guess I should have spotted when ordering it.. So this means that it's simply not fast enough for the application. I presume the delay is implemented in the chip so there'd be nothing I could do about removing it? Or does the capacitor do the delay (smaller capacitor, smaller delay?). Alternatively, is there a different switch I could buy that doesn't have this feature? Ideally it could do with it coming complete, I didn't realise the switch board would be a kit! It's OK doing one, but doing another 11 would be tiresome!!