BH1750
BH1750: Ambient Light Sensor
This specifically uses the GY-302 module (which I recommend, since it's eaiser to connect to an ESP32), which is a breakout board for the BH1750 sensor. This sensor is used to measure ambient light levels in lux.
View test code • View ESP Component • View ESP-IDF Library
Sensor Overview
Below are two pictures of the GY-302 BH1750 Light Intensity Module, and the Adafruit BH1750 Ambient Light Sensor. The GY-302 is a cheaper alternative to the Adafruit sensor, but both work well. WeatherStack specifically supports the GY-302 BH1750 Light Intensity Module, but the Adafruit BH1750 Ambient Light Sensor can also be used with some minor modifications to the code.
 |  |
|---|---|
| GY-302 BH1750 Light Intensity Module 1 | Adafruit BH1750 Ambient Light Sensor |
There are a few different modes that the BH1750 can operate in, which are:
| Mode | Precision | Measurement Time |
|---|---|---|
| Low Resolution Mode | 4 lux | 16 ms |
| High Resolution Mode | 1 lux | 120 ms |
| High Resolution Mode 2 | 0.5 lux | 120 ms |
High Resolution Mode 2 is the most accurate, but takes the longest to measure. Low Resolution Mode is the least accurate, but takes the least time to measure. High Resolution Mode 2 is the recommended mode to use, and the default.
On the chip, only the VCC, GND, SCL, and SDA pins are used, which are the power, ground, and I2C data and clock pins respectively.
The ADDR pin is not used.