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- import smbus
- import time
-
- # Get I2C bus
- bus = smbus.SMBus(1)
-
- # TSL2561 address, 0x39(57)
- # Select control register, 0x00(00) with command register, 0x80(128)
- # 0x03(03) Power ON mode
- bus.write_byte_data(0x39, 0x00 | 0x80, 0x03)
- # TSL2561 address, 0x39(57)
- # Select timing register, 0x01(01) with command register, 0x80(128)
- # 0x02(02) Nominal integration time = 402ms
- bus.write_byte_data(0x39, 0x01 | 0x80, 0x02)
-
- time.sleep(0.5)
-
- # Read data back from 0x0C(12) with command register, 0x80(128), 2 bytes
- # ch0 LSB, ch0 MSB
- data = bus.read_i2c_block_data(0x39, 0x0C | 0x80, 2)
-
- # Read data back from 0x0E(14) with command register, 0x80(128), 2 bytes
- # ch1 LSB, ch1 MSB
- data1 = bus.read_i2c_block_data(0x39, 0x0E | 0x80, 2)
-
- # Convert the data
- ch0 = data[1] * 256 + data[0]
- ch1 = data1[1] * 256 + data1[0]
-
- # Output data to screen
- print("Full Spectrum(IR + Visible) :%d lux" %ch0)
- print("Infrared Value :%d lux" %ch1)
- print("Visible Value :%d lux" %(ch0 - ch1))
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