When I was looking at servo's, I tried with PWM but I could not get PWM to slow down enouf.
Is there any way to slow down PWM without changing the crystal speed to something lower then 20mhz? Matt. On Jan 22, 3:28 pm, Sebastien Lelong <[email protected]> wrote: > > You obviously haven't tried it. If there is no load at the servo > > (e.g., when it is used to aim a sharp sensor), you can hear each > > irregular pulse. It moves slightly off and then corrects again. But > > when there is load on the servo, it moves away more (and takes more > > time to correct). > > I'll add all servos are rather unique, interrupted pulse may not have the > same impact. > > > > > I did numerous implementations of servo control and the reason I did > > not get to writin a lib yet is because it is pretty time-consuming to > > do it right. And IMHO it is not worthy to jallib to release a clumsy > > lib. But maybe my standards are too high and adds this library value > > to jallib, even if it does work properly when interrupts are used... > > If this is that time-consuming to reproduce PWM outputs in software, we > should use a dedicated chip (I'm back on this, no surrender Joep). Few > months ago, I found the following links: > > - IC to control LEDs with PWM. May be used for > PWMhttp://www.maxim-ic.com/quick_view2.cfm/qv_pk/4539 > - another IC for LEDs control, this one has been used in Arduino project > IIRC:http://focus.ti.com/docs/prod/folders/print/tlc5940.html > - some thoughts about PWM software > implementation:http://letsmakerobots.com/node/6282 > - Microchip AN about PWM software impl. for LEDs, > too:http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeI... > > As a reminder, "servo controller" topic on > jallib:http://groups.google.com/group/jallib/browse_thread/thread/53603e9bf0... > > > > On Jan 22, 1:46 pm, Sebastien Lelong <[email protected]> > > > As far as I'm concerned, I have not much problem with PIC being dedicated > > to > > > moving servos, without being able to do other things. I see this as part > > of > > > a servo controller board (even shield, for jaluino), with a dedicated PIC > > on > > > it. > > > It is not about a board dedicated to move servo's. It is about a board > > dedicated to moving *one* servo. > > Yes, of course. I mentioned 8 servos for one PIC. > > > And what is the value of board that can controle a servo, but has > > (hardly) any ability to receive information on the desired setpoint of > > this library? > > > IMO a proper library should enable an application (servo controller) > > that support multiple servo's and communication (i2c, serial) at the > > same time. > > Sure ! > > Cheers, > Seb -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
