Flora UV Index Sensor - Si1145 Light Sensor
Wearable FLORA breakout for the Si1145 digital UV index sensor with I2C interface, providing calibrated light level and UV index data.
Pinout
- Vin
Input to the onboard regulator; Adafruit says power with 3-5VDC and notes reverse-polarity protection.
Type · powerVoltage · 3-5VDC input - GND
Signal and power ground; connect to microcontroller ground.
Type · groundVoltage · 0V - 3Vo
3.3V output from the onboard regulator; Adafruit says up to 100mA can be drawn.
Type · powerVoltage · 3.3V output, up to 100mA - INT
Interrupt output from the SI1145 with a 10K pullup to 3.3V; indicates when conversions are done.
Type · signalVoltage · pulled up to 3.3V - LED
Open-collector IR LED drive pin for proximity use; Adafruit says connect IR LED cathode to this pin and anode to 3-5VDC, with sink spikes up to 300mA.
Type · signalVoltage · open collector, LED anode to 3-5VDC
Start wiring
I2C · Analog · 3.3 – 5 V · Breakout
Adafruit describes the CdS photoresistor as a light sensor whose resistance falls as light increases, and its product page gives an examp…
Module pins: Vin, 3Vo, GND, INT, LED, SCL, SDA. Schematik maps them to your board in the app.
Light & color
80 other optionsCdS photoresistors, I2C lux sensors like VEML7700 and TSL2591, multi-channel spectral sensors, UV detectors and TCS-series color sensors — about 80 listings for anything that responds to photons.
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