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Sle7in
01-13-2010, 04:07 PM
Can anyone help me with my project...I really2 hope anybody can teach me to finish up my project...plzzzz
I need to finish up this project within this 4 month...If not I'm gonna extend my study..sad..T_T

I'm actually developing an automatic solar tracking system...
anyone can check my work on the circuit because I'm don't really understand what I'm doing right now...not enough guidance...

these are my schematic using Proteus...

The Component use:

555 Timer
LDR (sensor) - sense the intensity of sunlight
stepper motor

I really don't have an idea how to use the stepper motor...which driver need to use...anyone can help me??



I attach some files regarding my project...

beenthere
01-13-2010, 05:54 PM
Here is a link to information about stepper motors.

You could help yourself by listing the functions of the device as a flowchart.

Not everyone has Proteus, so schematics posted as image files work better.

Sle7in
01-14-2010, 02:36 AM
thanks beenthere...but I can't see the link...

I attach some schematic and the details on the circuit operation regarding my project...can anyone check my circuit..is it ok or not...hope I can finish this part quickly because I want to move to the motor parts....can help me??

beenthere
01-14-2010, 12:36 PM
It helps if I put the link in - http://www.cs.uiowa.edu/~jones/step/

You have one output. How can it be used to control motion of the stepper motor?

Sle7in
01-15-2010, 06:32 AM
that's my problem....
I don't really familiar dealing with stepper motor...It also has its own driver...
Basically, I plan to construct a solar tracking system with dual axis which means that it can rotate horizontally and vertically...so, I need 2 circuit for 555 timer which is for horizontal axis and the other one is for vertical axis....both of them only have one output because the 555 timer only provide 1 output only at pin 3..do you have any idea how to re-construct my circuit or do you prefer any other motor in order to match with my project???

thanks beenthere...:)

beenthere
01-15-2010, 12:37 PM
First you say you need a driver for a stepper, then you say there is a driver, but two steppers. That is confusing.

Assuming there is a driver, what does it need for an input? How may a single input be used to control the tracker? Do you have specs on the various LDR's and have you simulated the LM555 with different ranges of resistance corresponding to different levels of light? Have you taken an LDR and a meter to see how it really does respond to sunlight?

Sle7in
01-15-2010, 08:06 PM
Sorry...
I'm not really familiar with stepper motor..I've search it and I just know that the stepper motor need a driver in order to control it..correct me if I'm wrong...

I just say that I plan to install 2 stepper motor..for controlling the direction..vertically and horizontally...I'm not saying there is a driver for 2 stepper motor...but, it's better for me to finish using 1 motor only right now..

Actually I'm also confuse on how to sense the intensity of sunlight because I've search it and it mention that LDR is not quite good to use and it is better to use photodiode..am I right??

Yes, I've simulate the circuit using various range of resistance and there is no output come out even though I vary the value of the LDR. That's why I need some guidance regarding my project...or if you have any idea to improve my project please tell me and teach me....Hope you are my saviour..^^

bertus
01-15-2010, 08:09 PM
Hello,

The following pages contain links on stepper motors and their drivers:
http://www.educypedia.be/electronics/motorstep.htm
http://www.educypedia.be/electronics/motorstepdriver.htm

I hope these will give you some info.

Greetings,
Bertus

Sle7in
01-16-2010, 05:09 AM
thanks bertus...
do you have any idea regarding my project???
Is it possible to make it by using 555 timer and LDR??
Is there any other motor that can be use which is more compatible to my solar tracker???easier to handle???

bertus
01-16-2010, 11:21 AM
Hello,

Perhaps the solar circuits page of the EDUCYPEDIA will give you some idea's :
http://www.educypedia.be/electronics/circuitssolar.htm

Greetings,
Bertus

Sle7in
01-16-2010, 02:57 PM
ermmm...sori for lack of information before...I've google some project and I found the solar trakcer that I want to develop..It's just the same....this is the link

http://electrofriends.com/projects/basic-electronics/automatic-solar-tracking-system-2/

I think I want to follow this project and I need some help to check whether it is possible for me to do it....I'm very weak on this...just need some guidance to finish my project...

I,ve simulate the timer circuit but I stuck on the motor parts because I'm not very familiar with CD 4017 and stepper motor...is it possible for me to use PIC16F84 to replace CD 4017???

beenthere
01-16-2010, 03:32 PM
Replacing the 4017 with a microprocessor increases the complexity by a large amount. You would need to condition the input an outputs, plus write the code to control the tracker. Making large changes to a circuit is difficult.

CD0417's are reasonably cheap. Both Mouser and Digi-Key carry them. The largest problem is obtaining the LDR's, unless their response is listed so you can get an equivalent.

retched
01-16-2010, 03:50 PM
If you are set on using light sensors for the following, you seem to be going in the right direction, however, for a very reliable way to do this, with a PIC, is to use sun location charts. It will tell you where in the sky the sun is at your location on that date at that time. You would then use the motors to aim the table to those angles. The equation can easily be programmed into the chip so you wouldn't need to update the chart.

This works just like the MEADE telescopes AutoStar device. You aim your telescope at a preset direction and the micro-controller turns the motors to aim the scope in the direction you want. All without optics. Optics that can go bad, or get bird droppings on, rain can distort views, ect. The no optic way will be very reliable. and use less power. If a bird dropping happens to land above one of the LSR, the array will go out of aim and use more power trying to recover.
The math has already been done and perfected. Easier to implement with only one or two motors, stepper driver and PIC/ (the optical version requires these and much more)

Sle7in
01-16-2010, 03:55 PM
So, you've check on the link I've given..what do you think??Is there any problems with the circuit???

I don't get it...is it hard to use LDR in my project???
I've already purchase the LDR and still working with the resistance..
Sorry if u need to talk the same thing many time...I just really don't get it...sad

Sle7in
01-16-2010, 03:58 PM
Thanks retched...
But I think I need to keep on going using 555 timer because it is my idea on the beginning..If I'm using PIC then I need to change my project title and it's gonna be a lot of problems to me...sad

Sle7in
01-16-2010, 04:05 PM
Replacing the 4017 with a microprocessor increases the complexity by a large amount. You would need to condition the input an outputs, plus write the code to control the tracker. Making large changes to a circuit is difficult.

CD0417's are reasonably cheap. Both Mouser and Digi-Key carry them. The largest problem is obtaining the LDR's, unless their response is listed so you can get an equivalent.

I don't get it..if I'm using 4017, I don't need to download any coding into 4017??

beenthere
01-16-2010, 05:41 PM
No. It's a counter. Google "cd4017" and get a data sheet.

Sle7in
01-16-2010, 06:39 PM
owh okkeyy...thanks...is the schematic for the motor controller circuit correct???

beenthere
01-16-2010, 07:15 PM
Looks like it will work.

Sle7in
01-16-2010, 08:53 PM
okkey...thanks...what about the schematic for the timer???Is there any changes to be made???

beenthere
01-16-2010, 09:21 PM
There may be, but as a result of differences in the LDR's.

Do you have access to any test equipment at all? It would be quite useful to build the LM555 part and see how that responds before sinking money into all of the project. What resources do you have locally? How will you construct the circuits?

Sle7in
01-17-2010, 07:34 AM
Ermm....firstly I'll simulate the circuit using the software...now I'm using Proteus...is there any other software??

After simulating I'll move to construct the circuit on the project board and check whether it will work practically before I move to construct the PCB board..

Actually my university provide their students with some amount of money to do their projects...I've done purchasing the basic component for my project...If there is quite complicated using LDR, then is there any other component which is better to use???

JoeJester
01-17-2010, 01:25 PM
Ermm....firstly I'll simulate the circuit using the software...now I'm using Proteus...is there any other software??

LTSpice and Tina-TI are free

Circuitmaker and pSpice have free student versions

Sle7in
01-17-2010, 01:41 PM
Thanks Joe...

You have the download link for that??

beenthere
01-17-2010, 10:30 PM
You can also search the site for threads that are close to your interest - http://forum.allaboutcircuits.com/showthread.php?t=32965

Sle7in
01-18-2010, 04:43 AM
thanks beenthere....

About to create differences in LDR value, I think I need to put the LDR in a box with a small rectangular slit in order to allow the light pass through the box...The the small rectangular slit will focused the sunlight to strike the LDR surface...so,the greater intensity of sunlight will obtain when the LDR directly facing the sun...is my idea can be accepted???

Sle7in
01-20-2010, 02:06 PM
Ermm...can anyone check my simulation circuit...there seems like something wrong because it don't give me any reaction when I run the simulation...:confused:

I attach .doc file...can anyone check my work...I really need to finish this fast...huhu