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Extend your light-sensing spectrum with
this analog UV sensor module. It uses a UV photodiode, which can detect
the 240-370nm range of light (which covers UVB and most of UVA
spectrum). The signal level from the photodiode is very small, in the
nano-ampere level, so we tossed on an opamp to amplify the signal to a
more manageable volt-level.
This sensor is much simpler than our Si1145 breakout, it only does
one thing and gives an analog voltage output instead of requiring a
complicated I2C setup procedure. This makes is better for simple
projects. It also has a 'true' UV sensor instead of a calibrated
light-sensor. To use, power the sensor and op-amp by connecting V+ to
2.7-5.5VDC and GND to power ground. Then read the analog signal from the
OUT pin. The output voltage is: Vo = 4.3 * Diode-Current-in-uA. So if
the photocurrent is 1uA (9 mW/cm^2), the output voltage is 4.3V. You can
also convert the voltage to UV Index by dividing the output voltage by
0.1V. So if the output voltage is 0.5V, the UV Index is about 5.
Please note, our UV LEDs are 400nm, outside the range of this sensor,
so if you're trying to test this sensor, don't use them! A UV tanning
lamp or 'lizard-lamp' will work much better.
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