Prashant_2102
Newbie level 4
![Newbie level 4](/styles/images/ranks/blevel1.gif)
Hello,
I am trying to wire up a load cell to an ADC.
Following is what I have done:
1) I have the following load cell
https://gtee.en.alibaba.com/product/1976603389-222472386/Micro_Load_Cell.html
Since this is a half bridge load cell, I have connected two of these to make a wheatstone bridge.
Now the output voltage for these load cells is 1mv/V, I need to amplify it 1000x to feed it to the ADC (which operates on 5V).
2) For this I have chosen the LM324 amplifier
https://www.ti.com/product/lm324
Now, this is a quad amplifier meaning I guess that it can be used to amplify 4 different inputs. I am going to use only one of it..
My question is how to get this amplifier to give a 1000x voltage gain. From what I have read I think I need to add some resistance in the circuit.. Basically I believe I need to create a circuit like this:
![laW1b.png laW1b.png](https://www.edaboard.com/data/attachments/52/52452-9889b36670b66b53804227663a0bf024.jpg)
my question is how do I decide what should be the value for resistors R1,R2,R3,R4..
I am a programmer and have zero electronics background... So, I'm sorry if my questions are very basic..
BR,
Prashant
I am trying to wire up a load cell to an ADC.
Following is what I have done:
1) I have the following load cell
https://gtee.en.alibaba.com/product/1976603389-222472386/Micro_Load_Cell.html
Since this is a half bridge load cell, I have connected two of these to make a wheatstone bridge.
Now the output voltage for these load cells is 1mv/V, I need to amplify it 1000x to feed it to the ADC (which operates on 5V).
2) For this I have chosen the LM324 amplifier
https://www.ti.com/product/lm324
Now, this is a quad amplifier meaning I guess that it can be used to amplify 4 different inputs. I am going to use only one of it..
My question is how to get this amplifier to give a 1000x voltage gain. From what I have read I think I need to add some resistance in the circuit.. Basically I believe I need to create a circuit like this:
![laW1b.png laW1b.png](https://www.edaboard.com/data/attachments/52/52452-9889b36670b66b53804227663a0bf024.jpg)
my question is how do I decide what should be the value for resistors R1,R2,R3,R4..
I am a programmer and have zero electronics background... So, I'm sorry if my questions are very basic..
BR,
Prashant