Adafruit Analog UV Light Sensor Breakout - GUVA-S12SD

Extend your light-sensing spectrum with this analog UV sensor module. It utilizes a UV photodiode capable of detecting the 240-370nm range of light, covering the UVB and most of the UVA spectrum. An integrated opamp amplifies the minimal signal from the photodiode to a more manageable voltage level.

This sensor offers straightforward functionality with an analog voltage output, devoid of the complexities of an I2C setup. Ideal for uncomplicated projects, it features a true UV sensor rather than a calibrated light sensor.

Power the sensor and op-amp by connecting the V+ to 2.7-5.5VDC and GND to power ground. Read the analog output signal from the OUT pin. The output voltage formula is: Vo = 4.3 * Diode-Current-in-uA, meaning a 1uA photocurrent yields a 4.3V output. Convert this to a UV Index by dividing the voltage by 0.1V.

For effective testing, avoid using UV LEDs at 400nm, as they fall outside the sensor's range. Instead, opt for a UV tanning lamp or lizard-lamp for accurate measurements.