I was wondering if anyone could help me with a fairly simple circuit design question. I am designing a simple circuit which consists of a UV photodiode and an ambient light photodiode.
I have found a device online containing the UV photodiode that I plan to use. Here is the schematic:
http://www.dfrobot.com/image/data/TOY0044/UV Senser sch.pdf
The problem is that I do not understand the use of R2 and R3 in the circuit. Most photodetection circuits that I have seen omit the use of these resistors. I was wondering if anyone could explain why they are included in the circuit? The circuit shown in the schematic is meant to interface with an Arduino. Could it be that R2 (at the output) is to eliminate reflections in the transmitted signal? I am clearly guessing.
I would get very grateful for any help!
I have found a device online containing the UV photodiode that I plan to use. Here is the schematic:
http://www.dfrobot.com/image/data/TOY0044/UV Senser sch.pdf
The problem is that I do not understand the use of R2 and R3 in the circuit. Most photodetection circuits that I have seen omit the use of these resistors. I was wondering if anyone could explain why they are included in the circuit? The circuit shown in the schematic is meant to interface with an Arduino. Could it be that R2 (at the output) is to eliminate reflections in the transmitted signal? I am clearly guessing.
I would get very grateful for any help!