Plenty of plans for this on the 'net. Google for "servo tester" &
you'll find plenty. Most use a pot. to set the servo position, but
substituting a switch & resistors (or trimmers) would be simple
There are some micros that can do this stand alone, without a servo
control board. For instance, our $79 TiniPod(TM) can do this with a very
5000 ( 1.00 mS
GRNLED ON REDLED OFF
10000 ( 2.00 mS
CR ." Servo Twitcher" CR
32767 PWMA0 PWM-PERIOD ( ~13.11 mS Timebase for PWM
7500 PWMA0 PWM-OUT
EVERY 50000 CYCLES SCHEDULE-RUNS ALL ( 100cps
( AUTOSTART STARTUP ( V.7 VERSION
Download that, let it autostart, and it's all done. Every time you power
up, it will run this servo positioning program. And it will still talk
to you in the foreground, if you want to check the servo position, or
even develop something else while this is running. Actually, it could do
this same thing for up to a dozen servos without any other hardware
That's pretty simple, but not as cheap as a 555.
Lots of stuff like below on the net using the 555 chip.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.