Servo does not move

[ruijc]

that's it !

i missed that !

thanks . it's working fine now.

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[ruijc]

I have all things working and changed the code to be more complete.

But still having some issues.

I've noticed that the value for the servo to be centered the pos must be 400 ( even with the original code )

for far left the value must be 1300

but for far right 0 is not enough.

i've tryed this but doesnt work...

right:
If pos > -100 Then
pos = pos - 10
Endif
servo1 = 1
Pauseus 1000 + pos
servo1 = 0
Pause 16 ' Servo update rate about 60Hz
Return

any ideas ?
and why arent the original values working for me ? I've seen many servo programs and all have the same values for center.

thanks

[Acetronics2]

Hi, Ruijc

I think you are "mixing" and misunderstanding some servo parameters here ...

so, before going further ... what is your servo model and brand ??? and what is your radio set ???

Alain

[ruijc]

Hi Alain,

thanks for your help.

i'm currently using a futaba's S148 servo.

My idea is to test any futaba and hitec servos ( digital and analog ).


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[Acetronics2]

Hi, Ruijc

héhé ...

Futaba S148 !!! the "mechanical neutral" ( half of the two geometric max positions ) ... corresponds to ~ 1300 µS ( an heritage of the old Robbe/Futaba join venture ! )

Now ... YOU must place your servo arm to have your "application neutral" with a trustable 1500µS pulse !!! ( remember Xtals are NOT generating exactly their nominal frequency ... especially for "common" ones )

Moreover consider Futaba "analogic" servos have a quasi-linear positionning in the 900-2100 µS range .

Outside those limits, you can send from 200 to 2500 µS pulses ... but with no more linearity at all !!! Specially at low values ... ( I did those tests to try to get 180° travel without any mod to the servos ...)

to fill the "bottle" ... your servos have a deadband of ~ 4/5 µS ... around their position, so, don't ask them to show you 1µS steps !!!

I did not test any Hitec servos ... so don't ask me for them !!!

Alain

[ruijc]

Got it Alain,

just changed the xtal from 4Mhz to 8Mhz and is was easy to tune !

thanks

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[ruijc]

One last question:

i found my 7805 getting very hot when my circuit is looping through auto motion.

The code is safe in terms of not letting the servo go to extremes and overloads the circuit.

It's just moving arround ( left and right ) on it's own.

Is there a way to control it's temperature ?

I'm trying to avoid using a heatsink because it will be in a small box.

any ideas ?