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Aaah - I think I'm getting it now. I have a reasonably working bit of code - though I still need to understand how the switches work. I will try and get a test rig up over the weekend.
...

Oooh..er. That's my reading for the rest of the day!


But I have one question (lots actually, but most will have to wait). You say that:

VAR1 EQU H'10'

makes the variable VAR1 equal to...

Hi, All,

I'm still using the PIC16F627. Thanks to Mister-E for pointing me at the data sheet (all 170 pages!!). I see that the data memory map is in 4 banks (I thought it was 2), and that there is...

"...OK - did I miss something here.. How the hell did this topic get from discussing telescope drives to discussing the merrits of death row ???

I gather the original poster gave up in the end and...

Well, I'm about to give up on this circuit - it's hard to see any future in it. Instead, I've just ordered one of these JaF Microstep modules. http://www.jafmotion.co.uk/motordrives.htm .

Let's...

Apologies for the confusion. What I meant to put over was:

I - refered to the website I got the stepper driver code I am using from (referenced in my first post.

You - said "Your...

T Jackson "Your reference to the website incurred me to think you found this code rather than wrote it..."

You are right. I have copied this code directly off this website. That's why I am on this...

"...but how many different model is there in the world...?"

He is using a standard chinese clock-drive for an EQ4/5 scope - so am I. I was expecting our motors to be identical....

"You can now...

Wow! A free oscilloscope! Thank you, Mister-e! Now I must find an old sound-card....

"Probably the original design used MOSFETs, so the voltage loss was reduced to a minimum..." - I thought I...

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...

Thanks for the education!

BOD off is still the same. It might have given a little more torque, or that might just have been wishful thinking on my part.

I have few capacitors on the board, just...

Umm...What's BOD? Are you talking about the regulator? Are you suggesting that I just feed the +5v regulated line from the battery directly, at 6.3V?

The difference seems to be minimal, and I...

No, very sensible question!

The circuit I have assembled is precisely as advertised here: http://telescope.marford.me.uk/Projects/PICcontroller.htm .

You will see that I am using a 16 pin...

Well, I tried!

In fact I don't have to double up the delay - it's 130x125, so I just alter the values.

Making the delay shorter (5x5) results in no movement from the motor at all - but I...

So many comments! Thanks, guys!

The original web-site indicates that this circuit works with the same motors I've got, so I was assuming the components were all reasonably balanced. The regulator...

Mister-e, thanks for the prompt reply!

The original commercial controller for this stepper uses an Amtel micro, driving an array of 8 transistors. It runs well off a 6v battery, and is...

Hi,

I'm not sure if I'm in the right place, so apologies in advance if this is not the correct forum, but I'm not sure exactly what I'm having trouble with! I have a telescope motor drive that I...