Servos not serving

[Acetronics2]

Alain,

I guess I'm missing something in your "Pause Refresh - Pulse - Pulse - Pulse" statement.

you're right ! I missed time scaling

should be

Pause Refresh - ((pulse + pulse + pulse)/100)

note Refresh could simply be 15ms ( as precise 50 Hz repeating signal is not compulsory - only the 1.2 - 2.4 ms "1" level - )

your travel time will simply be ...

(240-120)* 20ms = 2.4 seconds ...

[queenidog]

Just wanted to say thanks to all for your insightful comments and programming hints. I printed off the stuff for later perusal and comparison to my program. I'm a "minimalist", I program with the least amount of code required (thus don't always initialize) and even build circuits with low parts counts. That's where I get into trouble...

Thanks again.

[Tabsoft]

If you want the duty cycle to be as close to 50Hz you can do this to account for the Pulsout statements, Low xx statements, For/next logic and the Pause statement.

Change the Refresh constant value to 20000 'microseconds

Then use this for the pause.

Pauseus Refresh - (((pulse + pulse) + (pulse / 3)) * 10)

This should keep the total duty cycle time to 20ms +/- (~100) microseconds.

[Dave]

Queenidog, Here is a program I wrote some time ago for a couple of kids to test some servos for there robot in the FIRST competition. It is a minimalist program I wrote during lunch one day. It might help. Oh I forgot, Also attached is a schematic I updated a couple of years ago. Enjoy...