The SI1145 is a sensor from Silicon Laboratories with a calibrated light sensing algorithm that can calculate UV Index.
https://www.silabs.com/documents/public/data-sheets/Si1145-46-47.pdf
- IR Sensor Spectrum: Wavelength: 550nm-1000nm (centered on 800)
- Visible Light Sensor Spectrum: Wavelength: 400nm-800nm (centered on 530)
- Voltage Supply: Power with 3-5VDC
- Output Type: I2C address 0x60 (7-bit)
- Operating Temperature: -40°C ~ 85°C
The driver version for developers (si1145-dev.py) is slightly larger in size as it contains comments to help understanding
Download one of the following codes for your device:
# ESP8266 simple teste import machine import si1145 import time i2c = machine.I2C( sda=machine.Pin(4), scl=machine.Pin(5)) sensor = si1145.SI1145(i2c=i2c) for i in range(10): uv = sensor.read_uv ir = sensor.read_ir view = sensor.read_visible print(" UV: %f\n IR: %f\n Visible: %f" % (uv, ir, view)) time.sleep(1)# ESP32 simple teste import machine import si1145 import time i2c = machine.I2C( sda=machine.Pin(21), scl=machine.Pin(22)) sensor = si1145.SI1145(i2c=i2c) for i in range(10): uv = sensor.read_uv ir = sensor.read_ir view = sensor.read_visible print(" UV: %f\n IR: %f\n Visible: %f" % (uv, ir, view)) time.sleep(1)# LoPy simple teste from machine import I2C import si1145 import time i2c = I2C(0, I2C.MASTER, baudrate=100000) sensor = si1145.SI1145(i2c=i2c) for i in range(10): uv = sensor.read_uv ir = sensor.read_ir view = sensor.read_visible print(" UV: %f\n IR: %f\n Visible: %f" % (uv, ir, view)) time.sleep(1)# Micro:bit simple teste from microbit import i2c import si1145 import time sensor = si1145.SI1145(i2c=i2c) for i in range(10): uv = sensor.read_uv() ir = sensor.read_ir() view = sensor.read_visible() print(" UV: {}\n IR: {}\n Visible: {}".format(uv, ir, view)) time.sleep(1)