Simple test¶
Ensure your device works with this simple test.
1# SPDX-FileCopyrightText: 2021 by Bryan Siepert, written for Adafruit Industries
2#
3# SPDX-License-Identifier: Unlicense
4import time
5import board
6import adafruit_ltr390
7
8i2c = board.I2C() # uses board.SCL and board.SDA
9# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
10ltr = adafruit_ltr390.LTR390(i2c)
11
12while True:
13 print("UV:", ltr.uvs, "\t\tAmbient Light:", ltr.light)
14 print("UVI:", ltr.uvi, "\t\tLux:", ltr.lux)
15 time.sleep(1.0)
Configuration example¶
Adjust the configuration options for the sensor
1# SPDX-FileCopyrightText: 2020 by Bryan Siepert, written for Adafruit Industries
2#
3# SPDX-License-Identifier: Unlicense
4# pylint:disable=unused-import,no-member
5
6import time
7import board
8from adafruit_ltr390 import LTR390, MeasurementDelay, Resolution, Gain
9
10i2c = board.I2C() # uses board.SCL and board.SDA
11# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
12ltr = LTR390(i2c)
13
14# ltr.resolution = Resolution.RESOLUTION_16BIT
15print("Measurement resolution is", Resolution.string[ltr.resolution])
16
17# ltr.gain = Gain.GAIN_1X
18print("Measurement gain is", Gain.string[ltr.gain])
19
20# ltr.measurement_delay = MeasurementDelay.DELAY_100MS
21print("Measurement delay is", MeasurementDelay.string[ltr.measurement_delay])
22print("")
23while True:
24 print("UV:", ltr.uvs, "\t\tAmbient Light:", ltr.light)
25
26 # for shorter measurement delays you may need to make this sleep shorter to see a change
27 time.sleep(1.0)
Measurement threshold example¶
Be alerted when the measured value passes a high or low threshold
1# SPDX-FileCopyrightText: 2020 by Bryan Siepert, written for Adafruit Industries
2#
3# SPDX-License-Identifier: Unlicense
4# pylint:disable=unused-import
5import time
6import board
7from adafruit_ltr390 import LTR390, UV, ALS
8
9THRESHOLD_VALUE = 100
10
11i2c = board.I2C() # uses board.SCL and board.SDA
12# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
13ltr = LTR390(i2c)
14
15ltr.high_threshold = THRESHOLD_VALUE
16ltr.enable_alerts(True, UV, 1)
17
18while True:
19 if ltr.threshold_passed:
20 print("UV:", ltr.uvs)
21 print("threshold", THRESHOLD_VALUE, "passed!")
22 print("")
23 else:
24 print("threshold not passed yet")
25
26 time.sleep(1)