mesamune80

ya i had just tried out with my hardware.....hehe it works! but the voltage i measure to my uC is 5.25V when out of the Low lmt window =)
i wonder why the simulation cannot show the lit LED =.=''

ericgibbs

Hi,
Checked the circuit looks ok, refer this attachment.

I would suggest that you increase the 680R to about 750R or 820R, so that the input voltage to the PIC is just under +5V.

EDIT: If you plan to use a second input pin on the PIC for the other LM output, change the 1K0 to 750R and 330R .. OK?

Attached Images

sim1.jpg (142.1 KB, 9 views)

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

mesamune80

okay,ya i need my uC to monitor this two limit ,when the input just out from the windows then the corresponding upper and lower lmt pin will act accordingly. :-) actually i am using it for stepper motor.i will send pulse to the motor driver and move my motor up or down precisely. ('',)

ericgibbs

hi,
Lets know how the project goes..

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

mesamune80

Alright. :-) now i am doing the hardware part and also the programming part.

mesamune80

eric, there is one problem i encounter when i disconnect the uC the LED lit but when i connect to one of the I/O pin RC.6 the LED goes off. can i add anything to prevent this? Thanks

ericgibbs

hi,
It sounds as though you have configured PORTC.6 has an Output which is set low.
Post your code and we will advise.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

mesamune80

This is just the test code i used:

'************************************************* ********
'Declarations of variables
'************************************************* ********

Dim an4 As Word 'analog input RA5
Dim an5 As Word
Dim an6 As Word
Dim a4 As Byte
Dim a5 As Byte
Dim a6 As Byte
'Dim dir1 As Bit 'direction for motor1
'Dim dir2 As Bit 'direction for motor2
Dim i As Byte
Dim n As Byte
Dim n2 As Byte

a4 = an4.LB
a5 = an5.LB
a6 = an6.LB
Symbol dir1 = PORTC.1
Symbol dir2 = PORTC.2

TRISC = %00001111

loop:


If PORTC.6 = 1 Then

dir1 = 0
High PORTC.0
WaitUs 500
Low PORTC.0
WaitUs 500



Endif
Goto loop

ericgibbs

hi,
TRISC = %00001111

loop:
Look at the TRISC..... 0 = 0utput... 1 = 1nput

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

mesamune80

ya,from the above code i already se it as input right?

ericgibbs

hi,
NO,
Look at the TRISC..... 0 = 0utput... 1 = 1nput

The format of the binary number 00001111, is b7,b6,b5,b4,b4,b3,b2,b1,b0

As PORTC.6 is 0 in the TRISC it an OUTPUT. Set it to 1
example:
TRISC = %01001111

I have run your code in the simulator with TRISC= %01001111 and it works OK.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

ericgibbs

hi mesamune,
I am wondering if your misunderstanding of Input and Output is due to thinking that,
OUTPUT refers to the output of the Comparator, not the PIC pin.?

The TRIS set the pin configuration of the PIC pins not the external devices.

Do you follow.?

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/

mesamune80

Opss. i think i got it another way round,that's why i cant get the desired result,thanks for your clarification. ^_^

mesamune80

Hi eric could you give some advice on how to drive this motor?

because i had tried the normal way to run th motor,but it seem to not moving at all.i wonder why.

http://catalog.orientalmotor.com/ite...lter=&by=prod#

i wired my pulse input to CW/P.+ (pin for the motor driver)with high 250us and low 500us

and direction i pump high to the pin CCW/D.+ for my motor direction.

Thanks. =)

Attached Files

PMC33A1-MG20,_5-PhaseSteppingSystem.pdf (44.2 KB, 1 views)

ericgibbs

hi mesamune,
I'll look the documentation, you do realise its a 5 phase stepper motor.?

Are you meeting ALL the criteria for driving this type of motor.?

I have posted an extract from their data.

Attached Images

screenhunter1.jpg (77.4 KB, 3 views)

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's site: http://www.winpicprog.co.uk/
Gramo's site: http://www.digital-diy.net/