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This is a MicroPython library for the Raspberry Pi Pico and theBH1750 digital Ambient Light Sensor.

frommachineimportPin,I2Cfromutimeimportsleepfrombh1750importBH1750i2c0_sda=Pin(8)i2c0_scl=Pin(9)i2c0=I2C(0,sda=i2c0_sda,scl=i2c0_scl)bh1750=BH1750(0x23,i2c0)whileTrue:print(bh1750.measurement)sleep(1)

This is the circuit for the example code above. It uses theGY-302 BH1750 breakout board.

By default, the BH1750 class uses the following settings:

• Measurement mode: 'one time' (it measures once and then shuts down, a next measurement automatically powers thedevice back on and configures it again),
• Resolution: high (1 lx)
• Measurement time: 120 ms

These values can be changed via theconfigure method:

bh1750.configure(BH1750.MEASUREMENT_MODE_CONTINUOUSLY,BH1750.RESOLUTION_HIGH_2,BH1750.MEASUREMENT_TIME_MAX)

The example above configures the BH1750 to measure continuously, use a higher resolution (0.5 lx) and the maximummeasurement time. Configuration can greatly affect the measurement time. The BH1750 class has a generator function thatattempts to calculate the correct 'sleep time' between measurements based on the chosen configuration:

formeasurementinbh1750.measurements():print(measurement)