Hi,

So I'm trying to implement a a simple solar tracker(without the panels) using 2 LDRs and a TDA2822M IC.


I've been trying to make this circuit work for hours now, but there appears to be 0 volts across the output (Blue Wires.)
Things I've tried:
- Replacing the IC
- Using 7.4V instead of 3.7
- Tried different circuits online.
- Tried different size LDRs.

I didn't find any resources that online that had the same issue..
I hope someone can point out if I might be missing something.

 

Here it is on a breadbord

 

Learn how to draw a schematic and people will be more likely to help.

 

Learn how to draw a schematic and people will be more likely to help.

Sorry I didn't know that.
However, it's not that schematic itself, as I've tried many that I've found online.
There's a problem with my setup itself, probably something a noob would miss. That's what I'm looking for..

 

HELP!

 

I am not going ti dig out the datasheet to try to interpret your circuit.

 

Pin 6 is a negative input and pin 8 is a positive input. Is that what you want, not familiar with this IC and circuit?

 

I am not going ti dig out the datasheet to try to interpret your circuit.

Pin 6 is a negative input and pin 8 is a positive input. Is that what you want, not familiar with this IC and circuit?

The solar tracker should move the DC motor left and right based on light difference.
However, my circuit doesn't give output on pins 1 and 3. (Output 1 and Output 2 )


Here's a circuit diagram that is supposed to work. But I get no output on 1 and 3:

 

Thank you for the schematic and pinout diagram.

Look at your breadboard again. The two resistors are not connected together in the middle as they should be.

 

Thank you for the schematic and pinout diagram.

Look at your breadboard again. The two resistors are not connected together in the middle as they should be.

Connected them but same issue.
Maybe I burned the ICs. Going to buy some more tomorrow.. and report back.

 

Instead of just saying that it doesn't work, make some measurements and provide that information.

Remove the motor (so that it isn't loading anything down) and give us the voltages at each of the inputs. Do this with one LDR covered, then with the other, then with the two LDRs illuminated the same (as best you can).

 

The LDRs are also missing the same connection.

 

Instead of just saying that it doesn't work, make some measurements and provide that information.

Remove the motor (so that it isn't loading anything down) and give us the voltages at each of the inputs. Do this with one LDR covered, then with the other, then with the two LDRs illuminated the same (as best you can).

I've tried everything.
The 2 outputs give about 0 volts. Covered or not.

The LDRs work I tested them.
I even tested 3 different power supplies.

It's just interesting how I bought 2 ICs, and they both don't work..

The LDRs are also missing the same connection.

It's not a wiring issue. I've rewired this 10s of times.
I've also replicated those "On the fly" circuits where they solder components directly together. No luck.
As a someone who doesn't know much about circuits, I see only two possible options:
1- I fried both of the TDA2282M.. No Idea how though.
2- They're both defective.

 

Your wiring us still incorrect, despite your assertions. I will let you figure it out. It took me only seconds to see it. cYou should be able to find it.

Here is a technique for you. Print a copy if the schematic. Now look at you lr beadbiard and mark each connection on the schematic. Then you will what is missing.

 

Your wiring us still incorrect, despite your assertions. I will let you figure it out. It took me only seconds to see it. cYou should be able to find it.

Here is a technique for you. Print a copy if the schematic. Now look at you lr beadbiard and mark each connection on the schematic. Then you will what is missing.

The LDRs are both connected to pin 8. One is going to VCC and other to ground. That's correct according to my limited knowledge of how circuits work
Also I'm using 1K resistors intentionally.

And the circuit is on a tablet next to me.

 

I've tried everything.
The 2 outputs give about 0 volts. Covered or not.

The LDRs work I tested them.
I even tested 3 different power supplies.

It's just interesting how I bought 2 ICs, and they both don't work..

I can't help you since you won't tell us what the voltages at the inputs of the two amplifiers are. Without that apparently super-secret information, there is no way for us to even guess whether they are reasonable or what the output voltages should be, let alone whether what you are seeing makes sense or not.

So I'm moving on. Good luck.

 

Check your jumper wires for continuity too.

 

Given the simple circuit you intend to implement, I suggest you to tidy up things buy starting afresh in an orderly sequence.

Do a favor yourself and learn to work in a neater way.

 

I can't help you since you won't tell us what the voltages at the inputs of the two amplifiers are. Without that apparently super-secret information, there is no way for us to even guess whether they are reasonable or what the output voltages should be, let alone whether what you are seeing makes sense or not.

So I'm moving on. Good luck.

I don't even know how to do that.

 

Your wiring us still incorrect, despite your assertions. I will let you figure it out. It took me only seconds to see it. cYou should be able to find it.

Here is a technique for you. Print a copy if the schematic. Now look at you lr beadbiard and mark each connection on the schematic. Then you will what is missing.

You are right. Just bough 3 more TDA2822M and they all don't work. So something is very wrong with my wiring.
However, I've been looking at the circuit for almost 2 hours now, and still can't figure it out.