I want to measure varying voltage with arduino, but the circuit I made has to have 10V supply. And arduino cannot have voltage greater than 5V.

The circuit I made is attached below. Please have a look, and give me any advice about how to design circuit with arduino for measurement.

I also have an extra adc for better measurement.

 

http://lmgtfy.com/?q=measuring+voltage+with+an+arduino

 

What is the load? How does it vary and how often does it vary? Why do you need to track voltage at that point?

 

http://lmgtfy.com/?q=measuring+voltage+with+an+arduino

What is the load? How does it vary and how often does it vary? Why do you need to track voltage at that point?

The load is a sensor that changes its resistance, and in the circuit, constant current flows over the load. So I can see the change of resistance by measuring the voltage.

 

Why not split/tap the emitter resistor....for the correct span of voltage you wish.

You can tap a resistor by replacing it with two resistors. A voltage divider.

 

Why not split/tap the emitter resistor....for the correct span of voltage you wish.

You can tap a resistor by replacing it with two resistors. A voltage divider.

I don't want to use voltage divider because of its non-linearity.

 

Why do you think a voltage divider would be non-llinear ?

Les.

 

Resistive diveder highly linear -




Regards, Dana.