I’m having trouble with my 4 channel servo multiplexer. I used it for a project two years ago and I think it worked (I have enough trouble remembering last month, let alone 2 years ago), but now it is giving me trouble. The master channels all work, but I can’t seem to get the select input to select the secondary inputs. I checked my signal with a servo and it looks fine, I also checked with my 'scope and the input goes from 1.1 ms to 1.9 ms at about 3v. Any ideas what is wrong? I could have blown something out I suppose, but the master works and the default jumper seems to do what it is supposed to do (detect an invalid signal – it is always invalid apparently). Am I doing something wrong?
Also, it would be really cool if there was a way to use a logic signal (in place of or in addition to the PWM signal) to select the inputs. It seems like that would be a fairly simple addition (Pololu?)