TSL2591 ambient light sensor measuring both full-spectrum and infrared channels via I2C; lux range 188µlux to 88,000 lux with 600,000,000:1 dynamic range. Accepts 3.3–5V via onboard regulator. Draws ~0.4mA active.
Power input from the Adafruit Learn pinouts page, use 3V for a 3V microcontroller or 5V for a 5V microcontroller.
3.3V regulator output from the Adafruit Learn pinouts page.
Common ground for power and logic from the Adafruit Learn pinouts page.
I2C clock pin, connect to the microcontroller I2C clock line according to Adafruit Learn.
I2C data pin, connect to the microcontroller I2C data line according to Adafruit Learn.
Interrupt output from the TSL2591 sensor; Adafruit Learn says it can be programmed for conversion or light-change events, with no library support noted.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| Vin | Power header pad | power | Power input from the Adafruit Learn pinouts page, use 3V for a 3V microcontroller or 5V for a 5V microcontroller. | 3-5V |
| 3Vo | Power header pad | power output | 3.3V regulator output from the Adafruit Learn pinouts page. | 3.3V output, up to 100mA |
| GND | Power/header ground pad | ground | Common ground for power and logic from the Adafruit Learn pinouts page. | 0V |
| SCL | I2C header/STEMMA QT clock contact | i2c clock | I2C clock pin, connect to the microcontroller I2C clock line according to Adafruit Learn. | |
| SDA | I2C header/STEMMA QT data contact | i2c data | I2C data pin, connect to the microcontroller I2C data line according to Adafruit Learn. | |
| INT | Interrupt header pad | digital output | Interrupt output from the TSL2591 sensor; Adafruit Learn says it can be programmed for conversion or light-change events, with no library support noted. |
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, GND, SCL, SDA. Schematik maps them to your board in the app.
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