Please help !

Thread Starter

juhi1107

Joined Oct 11, 2011
17
HI

I am doing a project on dual axis solar tracker using PIC microcontroller ,ULN 2003 and 2 stepper motors


and someone please post a circuit ?? and also as to how to proceed !?
I have no idea about electronics !!!!!!
 

t06afre

Joined May 11, 2009
5,934
HI
I am doing a project on dual axis solar tracker using PIC microcontroller ,ULN 2003 and 2 stepper motors and someone please post a circuit ?? and also as to how to proceed !? I have no idea about electronics !!!!!!
Sounds to me like this is a school project. And you do not know how to start. You are not the first nor the last person with such a request. First of all we will not just hand over a turn key ready solution. But we will be more than happy to discuss specific problems with you. Just remember good questions draw good answers. As a start divide your problems into several more or less isolated problems. And select which PIC you will use. Then select if you will be using assembler or C/BASIC.
 

Thread Starter

juhi1107

Joined Oct 11, 2011
17
PIC16F877A is what I am going to use
the first stage is designing the circuit. I am thinking of using MikroC . I need direction on how to start . Please help me with the circuit diagram . ASAP
 

bertus

Joined Apr 5, 2008
20,465
Hello,

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nerdegutta

Joined Dec 15, 2009
2,676
In the link I gave in post #2, there might be a schematic you can use for one of the steppers. You need one for each steppermotor. Or maybe one ULN 2804A for both the steppers...?
 

Thread Starter

juhi1107

Joined Oct 11, 2011
17
No I Plan to use two ULN2003 for 2 stepper motors.
Thanx for the link.
I do have a rough idea of how to use one ULN in the circuit but please help me with using 2.
 

nerdegutta

Joined Dec 15, 2009
2,676
Could you use two of the schematics from the link in post #2?

Perhaps side-by-side. Sharing the same powersupply. Connecting PIN 3 and 4 from one ULN2003 the PIC's RC0 and RC1. And from the other ULN2003 to the PICs RC2 and RC3...

You even might need some transistors and resistors in between...

Just thinking loud...
 

MrChips

Joined Oct 2, 2009
20,917
juhi1107,
A few tips you should know about forums:
1. A title like "Please help!" is not very helpful. Learn to post a proper descriptive title.
2. If you ask for a circuit diagram, you will not get one. Post one yourself first.
3. If you want it ASAP, that means As Slow As I Please, i.e. in good time buddy, or do it yourself.
 

John P

Joined Oct 14, 2008
1,808
Seems kind of familiar:

dual axis solar tracker project help prem25 The Projects Forum 4 03-29-2011 08:08 PM
dual axis solar tracker (mppt) himanshu1990 The Projects Forum 11 08-31-2010 11:32 AM
Help with solar tracker electronicsnewbie The Projects Forum 7 01-18-2010 02:48 PM
need HELP on dual axis solar tracker kevinng The Projects Forum 07-18-2011, 03:56 PM

And there are quite a few more. What's up with all this stuff? Hasn't anyone built it yet?
 

Thread Starter

juhi1107

Joined Oct 11, 2011
17
@nerdegutta - Thank you for that link - I had already read that. It was useful.
I have made a circuit but I just need to know whether another stepper motor can be connected to it using another ULN and if it can be please help with the circuit.
@Mrchips - Thank you for your insights. I am posting the circuit. :)
@John P - I wonder :p
@tgotwalt - I have started building it with other circuit components so no scope of copying - :O
 

tgotwalt1158

Joined Feb 28, 2011
110
@nerdegutta - Thank you for that link - I had already read that. It was useful.
I have made a circuit but I just need to know whether another stepper motor can be connected to it using another ULN and if it can be please help with the circuit.
@Mrchips - Thank you for your insights. I am posting the circuit. :)
@John P - I wonder :p
@tgotwalt - I have started building it with other circuit components so no scope of copying - :O
Ok then, but you will have to use ULN2803. I have sketched the diagram with the help of Win-Paint since I do not have other software. See the attached file. By the way, by copying, I meant copying the concept not the diagram!
 

Attachments

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Thread Starter

juhi1107

Joined Oct 11, 2011
17
Thank you tgot for your time :)
why do you prefer ULN2804 ? and I wanted you to show me the connections of the two ULN with the PIC because I know the connections OF the two ULN2003 with the motors.
 

Thread Starter

juhi1107

Joined Oct 11, 2011
17
also pleasse tell me how to program my PIC ? which is the best compiler in terms of taking the minimum time to learn ?
 

tgotwalt1158

Joined Feb 28, 2011
110
Thank you tgot for your time :)
why do you prefer ULN2804 ? and I wanted you to show me the connections of the two ULN with the PIC because I know the connections OF the two ULN2003 with the motors.
Never mind, it was a breeze to me to draw the diagram in paint. As far as the selection of ULN2803 is concerned, just I liked this way. In your post 10 and 15 you requested the same i.e. how to connect two stepper motors with two ULN's, and now you got that. Any port with digital I/O supporting TTL buffer type, e.g. RD0~RD7 but you will have to configure those pins.
 
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