Hi!
For my masters thesis i have to develop a scaled helicopter test bench. To test te lift force of the helicopter I use load cells. I found a solution online to make a load cell circuit with an arduino to process the measured forces. Everything works, but the precision of the circuit isn’t good enough.
In picture 1 you can see the circuit I used.
For a load of 20 kg I should get a value of 1023 after the arduino A/D converter. The maximum value I can get is 864.
So now I have a few questions that could help me get a more precise circuit.
1) Could anyone explain me what the capacitor does? I know HOW a capacitator works, but i don’t understand what it does here. Could it influence the precision?
2) I didn’t use a breadboard but made a pcb. I thought this would be better. Is this correct? I would test it by making a new circuit on a breadboard, but I’m out of components.
3) I used these load cells: http://www.phidgets.com/products.php?category=34&product_id=3134_0
I have problems with residual stresses, but I can solve this with my Arduino. Could it be that they aren’t precise enough?
For my masters thesis i have to develop a scaled helicopter test bench. To test te lift force of the helicopter I use load cells. I found a solution online to make a load cell circuit with an arduino to process the measured forces. Everything works, but the precision of the circuit isn’t good enough.
In picture 1 you can see the circuit I used.
For a load of 20 kg I should get a value of 1023 after the arduino A/D converter. The maximum value I can get is 864.
So now I have a few questions that could help me get a more precise circuit.
1) Could anyone explain me what the capacitor does? I know HOW a capacitator works, but i don’t understand what it does here. Could it influence the precision?
2) I didn’t use a breadboard but made a pcb. I thought this would be better. Is this correct? I would test it by making a new circuit on a breadboard, but I’m out of components.
3) I used these load cells: http://www.phidgets.com/products.php?category=34&product_id=3134_0
I have problems with residual stresses, but I can solve this with my Arduino. Could it be that they aren’t precise enough?