Elecrow Crowtail Light Sensor 2.0 Module w/ GL5516 Photoresistor & LMV358 Chip - Analog Output

The module is designed to operate from a 3.3V or 5V DC power supply. You must connect it to a compatible voltage source on your microcontroller or development board. The analog output signal will scale proportionally with this supply voltage.

Connect the module's VCC and GND pins to the Arduino's 5V and GND. Connect the module's analog output (SIG) pin to one of the Arduino's analog input pins (e.g., A0). Use the `analogRead()` function in your sketch to read the voltage value, which will correspond to the ambient light level.

The LMV358 operational amplifier is configured as a voltage follower (buffer). It takes the variable voltage from the GL5516 photoresistor and provides a stable, low-impedance output. This prevents the microcontroller's ADC from loading the sensitive sensor circuit, ensuring more accurate and consistent analog readings.

This module provides a relative analog voltage output that correlates with light intensity. It is not factory-calibrated to provide direct lux readings. To estimate lux, you would need to perform a calibration against a known light source using a reference lux meter and map the analog readings to a calibration curve in your code.

The included 4-pin Crowtail cable provides a convenient plug-and-play connection to Crowtail base shields or compatible boards. For direct wiring, you can solder to the module's pins, but the cable simplifies prototyping and reduces connection errors.