Why is this so F****** hard to get a clear answer on the subject?
I have a Wheatstone bridge that i want to interface with a microcontroller, but cant figure out what way to do it! Maybe you can help?!?
As I see it I have following options (Please correct me if I need anything (components, filters, eg.) or am simplifying something too much)
1)
Connect a 16ísh bit ADC that can read +-10mv (aprox. Output from bridge when force is applied). To power I need to configure a circuit with a voltageregulator to power the bridge (to ensure that the fluctuations in the 10V supply wont show in my output, I connect the 10Vsupply to the ADCs Vref (I am unsure about this???!!).
Then I should have a digital signal I can use
2)
Same as above but I have seen people make their own opamp prior to the ADC (I am unsure why this is done instead of buying an ADC with internal opamp. Does anyone know why?
3)
The last possibility is that I have a device I can connect to 24V and to the bridge. It will give me an output of +-10V. The thing is that I cant read that with my Arduino. So that leaves me with the option of setting up an other op-amp to bump the +-10V signal to 0-5V or getting a ADC that can read +-10V directly from the device.
I find option 1) or preferable to option 3) but I am unsure.
Thanks, I appreciate it.
I have a Wheatstone bridge that i want to interface with a microcontroller, but cant figure out what way to do it! Maybe you can help?!?
As I see it I have following options (Please correct me if I need anything (components, filters, eg.) or am simplifying something too much)
1)
Connect a 16ísh bit ADC that can read +-10mv (aprox. Output from bridge when force is applied). To power I need to configure a circuit with a voltageregulator to power the bridge (to ensure that the fluctuations in the 10V supply wont show in my output, I connect the 10Vsupply to the ADCs Vref (I am unsure about this???!!).
Then I should have a digital signal I can use
2)
Same as above but I have seen people make their own opamp prior to the ADC (I am unsure why this is done instead of buying an ADC with internal opamp. Does anyone know why?
3)
The last possibility is that I have a device I can connect to 24V and to the bridge. It will give me an output of +-10V. The thing is that I cant read that with my Arduino. So that leaves me with the option of setting up an other op-amp to bump the +-10V signal to 0-5V or getting a ADC that can read +-10V directly from the device.
I find option 1) or preferable to option 3) but I am unsure.
Thanks, I appreciate it.