> ----------
> From: Tim Kerby[SMTP:
tim.kerby
KILLspamUKONLINE.CO.UK]
> Reply To: pic microcontroller discussion list
> Sent: Thursday, December 11, 1997 8:00 AM
> To:
.....PICLISTKILLspam
.....MITVMA.MIT.EDU
> Subject: Servo Laser Control
>
> Hi
> For my higher (Scottish version of A level) Computing Studies
> investigation
> I am looking into the control of laser light shows by computers. As
> well
> as contacting various companies, I want to build a PIC based servo
> controller. This will accept RS232 from a PC giving the following
> data
>
> H0 to H255 - Horizontal position from leftmost (0) to rightmost (255)
> V0 to V255 - As horizontal but vertical control.
> S0 or S1 - shutter closed (1) and open (0)
>
> These will be in the form of a bite of ascii as an identifier (H, V or
> S)
> followed by the value.
> This will be carried out on the 16C84 which is easily adequate for
> this
> processing.
>
> To save me time on coding and working out how to do the serial control
> and
> the servo control I would like some help. This is because I only have
> 20
> hours from start to finish (cruel computing teachers - who can do much
> in
> this time).
>
> I would like people to send well documented serial and servo control
> software that they use and know works. Some theory on the servo side
> would
> be nice too. What really annoys me is the lack of details such as
> pinout
> to the devices. Circuit diagrams would be even nicer.
>
> I understand that servos have power and a PWM input line that
> translates to
> position but can the pic drive the PWM line directly? The servos draw
> a
> max of 500ma but I presume this is from the power lines.
>
>
> My plan is this
>
> 1 All initialisation carried out
> 2 Start values are placed in a variable (to center the servos 080H)
> 3 Loop with the correct pulsing to both servos. BTW how do you do
> both at
> once?
> Set shutter appropriately (solenoid)
>
> Interrupt: On change of serial line
> 1 Read serial inputs (all 3) and store in 6 bytes of memory
> 2 Look at identifier and place each variable into appropriate register
> (called in main loop)
> 3 Return to the start of stage 3 above with new data.
>
>
>
> Can anyone help? If you have an include or header to do serial and
> servo
> stuff then this would be best but I can make do with any well
> documented code.
>
>
>
> Send to my private email (
EraseMEtim.kerbyspam_OUT
TakeThisOuTukonline.co.uk) if you are
> attatching
> code. This wont clog the list.
>
>
> Thankyou very much
>
> Tim Kerby
>
>
>
> ------------------------------------------------------------------
> Personal Web Pages:
http://web.ukonline.co.uk/members/tim.kerby/
> Email:
tim.kerby
spam_OUTukonline.co.uk
> ------------------------------------------------------------------
>