I have been digging the past topics and googled so far but haven’t figured out the way.
I am trying to create an application where I use 470nm photodiode sensor to sense ‘harmful’ blue light from the screen. With my portable multimeter, I have somehow successfully observe the voltage increment, however when the sensor is read from Arduino A0 pin with analogReference(), the value seems to be far from correct.
Basically, when the value is less than 1.0V, input value suddenly seem to oscillate and when I apply the light torch directory, the number stays. I have tried to cover the sensing surface and this occurred as well.
For my setup, I am directory connecting anode of the photodiode to A0 followed by cathode to GND of Arduino.
If you tell me how can I get the stable value even when the voltage is not significant, please let me know!