OK, so my scenario is that I have two 10K joysticks and they don't exactly go to zero or 10k between the slider and the end point. something like 200ohms at the bottom and about 9.7/9/8 at the top end.
The requirement is that I have a reference voltage of 1.8 volts and a VCC of 5v available, but no negative voltage unless I add a small camera battery in.
The aim is to be able to output 0v - ref voltage ( 1.8 ), so I think I might need a -ve supply, but not sure if it can be done without on.
I was thinking about using an op amp, but I don't really know too much about them, and was wondering if anyone can suggest a circuit which will enable me to do this.
Many thanks.
The requirement is that I have a reference voltage of 1.8 volts and a VCC of 5v available, but no negative voltage unless I add a small camera battery in.
The aim is to be able to output 0v - ref voltage ( 1.8 ), so I think I might need a -ve supply, but not sure if it can be done without on.
I was thinking about using an op amp, but I don't really know too much about them, and was wondering if anyone can suggest a circuit which will enable me to do this.
Many thanks.