I wanted to try to create an analogue circuit that would trigger a sonic ra=
nge finder (SR04) so that I could check things out with a scope.  It requir=
es a 10us pulse to start it.  (Then the output line goes high relative to t=
he distance.)  I don't think I have the ability (yet) to do much more with =
it though.  The intent is to connect it to a Pi.

What I wanted was a 10us pulse every second or so, and I found a handy 555 =
laying around.  However, using the nice calculator I found below, I couldn'=
t manage to get anywhere near the results I wanted no matter what I put in.=
   (The largest capacitor I have is 100 uF.)  Is this possible?  I know it =
should be.

Thank you!
Lindy

http://www.ohmslawcalculator.com/555_astable.php


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