Converting 0 to 2.5V from an arduino to -5 to 5v

[johnerrington]

@matalog

From my knowledge of Op-Amps, I understand that I could use 3

Or 1

Using Operational Amplifiers in your Arduino project

8: Example 2. Amplifying a signal from a sensor when it has an offset voltage Many common sensors will produce a voltage that does not "sit" on the 0V rail, as shown in the blue line in this example. [opamp signals3.png] The green signal is too small (say 0.04V) to measure with any accuracy; however by amplifying it by 100 we get a signal of around 0.04*100 = 4V that can be measured. However the signal on the blue line is small, but has a dc offset of about 2.5V; multipling that by 100 gives…

you will need a split supply, say 9 - 0 - 9V