Dear all,I want to use arduino to read an output of photodector. But the output voltage is on the negative voltage range and depending of incident light is in the range from -100mV to -1V. How to convert the signal from negative to positive region, idealy via 1:1 invertor. I have read about inverting operational amplifier (op), and how a question about connection of op, photodetector and arduino. How do do such a connection and which op it is better to use?