about solar tracker

[kevinng]

Just a simple question, can the circuit shown here works?
I have constructed the circuit, and apply a 9v DC voltage, but it seems like not working at all...

file:///C:/Documents%20and%20Settings/User/Desktop/fyp/2.jpg

This is the circuit loos like
**broken link removed**

This is how I wanted to construct the structure of the tracker
**broken link removed**

 

[carbonzit]

To show us an image, you either have to put it in an "album" on this site and give a link to it like you did, or use the "manage attachments" button in the editor to upload it as an attachment. Looks like you tried to give us a link to the picture on your local computer's desktop, which ain't gonna work.

 

[tytower]

Well I suppose we could have a look but it would be quickerif he did the above

 

[kevinng]

ok, thank you very much..
I've done the the uploading..
but now there's another problem, can a RC hobby servo motor use in this circuit?
because I just realised that a RC servo motor receive signal like PWM or from PIC instead of a signal from comparator, is that true?
Then is there any better choice of motors that I could be considered?

 

[kevinng]

RC hobby servo motor with op-amp comparator

I am a final year project student, I need to build a solar tracker which requires a low rotational speed. I have a few questions about the topic, the circuit is shown below.

1.Can a RC hobby servo motor use in a H-bridge and connected to a LM1458 comparator?

2. If it doesn't work like that, then what motor should I use for high torque low speed purpose?

3. can a bipolar stepper motor use in this circuit?

**broken link removed**

 

[ericgibbs]

hi kevinng,
Its pointless and confusing to open 6 threads on the same topic.

 

[colin55]

The circuit only works with a 3-pole 3vDC to 12vDC hobby motor and gearbox. Nothing else.

 

[senzafine]

can anybody tell me why those resistances where used and not some other values ?

 

[tytower]

generally you are looking to pick off certain voltages. You do not need much current flow into the LM1458 . The combination shown gives useable values . You can use anything else if it will give the right voltage levels but you just don't want to use any more power than you have too

 

[KeepItSimpleStupid]

The resistors are somewhat arbitrary. But the photocell and the dividers are ratiometric with the power supply. High values of R conserve power.

On value is off slightly so it provides some amount of hysteresis if the adjustments are pegged.