Telescope drive motors that don't...

[Dodgy Geezer]

Mister-e '..Is there any exact motor Model we can refer to?..'

There are no markings on the motors. The original controller used a 6v battery pack, and the coil resistance is 18ohm. A similar looking motor is the BPM42 from Astrosyn, but that is specified as 12v.

Joe S. - thanks for joining the party! i would be happy to rewrite the code in Basic if that would help, but I think the code is working. I programmed the PIC on a Vellerman 8048 unit, which has a limited test function (6 leds and 4 switches), and the test showed the leds all lighting up at the right times. I have also run the code on a couple of software simulators, and it does what it says it does - holds the specified pins high.

What I cannot simulate is what the L293D is doing (no oscilloscope ). In other circuits I see the possibility of varying the current passed to the stepper, but I don't think you can on the L293D. How does the chip know how much current to pass the stepper?

The Lini Stepper is very interesting, and I would buy one like a shot - if it supported Bipolar steppers like I have on the telescope. Unfortunately, the telescope hardware is fixed. I was wondering about getting one of these - http://www.jafmotion.co.uk/motordrives.htm

[Archangel]

Mister-e '..Is there any exact motor Model we can refer to?..'

There are no markings on the motors. The original controller used a 6v battery pack, and the coil resistance is 18ohm. A similar looking motor is the BPM42 from Astrosyn, but that is specified as 12v.

Joe S. - thanks for joining the party! i would be happy to rewrite the code in Basic if that would help, but I think the code is working. I programmed the PIC on a Vellerman 8048 unit, which has a limited test function (6 leds and 4 switches), and the test showed the leds all lighting up at the right times. I have also run the code on a couple of software simulators, and it does what it says it does - holds the specified pins high.

What I cannot simulate is what the L293D is doing (no oscilloscope ). In other circuits I see the possibility of varying the current passed to the stepper, but I don't think you can on the L293D. How does the chip know how much current to pass the stepper?

The Lini Stepper is very interesting, and I would buy one like a shot - if it supported Bipolar steppers like I have on the telescope. Unfortunately, the telescope hardware is fixed. I was wondering about getting one of these - http://www.jafmotion.co.uk/motordrives.htm

I wasn't asking you to rewrite anything, Your reference to the website incurred me to think you found this code rather than wrote it, my appologies! My statement stands as is, I do not understand your code, so I do not know that it did that, I was simply suggesting a possible area to search.
Regards
JS

[mister_e]

ASM looks way harder than it is actually.

Let's see few common expressions

MOVLW .10
MOVWF PORTA
It's nothing else than PORTA = 10
<hr>
BTFSC PORTA.1
GOTO $-1

Could be translated as

WHILE PORTA.1=1 : WEND

OR

TestPORTABit1:
IF PORTA.1=0 then GOTO DoSomething
Goto TestPORTABit1
DoSomething:
<hr>
MOVF PORTA
MOVWF MyVar

would be MyVar=PORTA
<hr>
INCF MyVar,F

MyVar=MyVar + 1
<hr>
nothing really hard to learn... but yeah... could be a bit hard to follow/understand a little bit when you begin. 18Fs and DsPIC assembler is way easier to code, but you have more Mnemonics to learn.