Hi,
I am having diffuclt times with this sensor, so I kndliy ask for your help!
The sensor is named "SPUVA-CS-C3535-A", datasheet here.
The sensor I use (cs3535) has just two pins (+ and -).
From my undesrstanding the ouput is a current corresponding on the UV light exposed to this sensor.
Max value of the current is difficult to understand from the datasheet that also do not have a typical suggested circuit. It seems that a medium value is 200nA, it seems really low!
I have connected (+) of the sensor to 3.3V, (-) of the sensor to A0, and a 220ohm resistor from A0 to Gnd. But readings are always 0.
Any help would be really appreciated! Thanks
I have connected (+) of the sensor to 3.3V, (-) of the sensor to A0, and a 220ohm resistor from A0 to Gnd. But readings are always 0.
Sure, the 200nA * 220Ω results in a voltage of about 44µV. The resultion of a typical 3.3V Arduino is in the range of 1mV. I have no experience with such sensors but I guess you need to amplify the output to get a useful result on an Arduino.
What you have there is a photodiode... They're a bit special in the way they have to be used.
You need an amplifier for your diode... here's a starting idea of what's needed - Transimpedance amplifier - Wikipedia