Simple test

Ensure your device works with this simple test.

examples/ltr390_simpletest.py
 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()
 9ltr = adafruit_ltr390.LTR390(i2c)
10
11while True:
12    print("UV:", ltr.uvs, "\t\tAmbient Light:", ltr.light)
13    print("UVI:", ltr.uvi, "\t\tLux:", ltr.lux)
14    time.sleep(1.0)

Configuration example

Adjust the configuration options for the sensor

examples/ltr390_configuration_example.py
 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()
11ltr = LTR390(i2c)
12
13# ltr.resolution = Resolution.RESOLUTION_16BIT
14print("Measurement resolution is", Resolution.string[ltr.resolution])
15
16# ltr.gain = Gain.GAIN_1X
17print("Measurement gain is", Gain.string[ltr.gain])
18
19# ltr.measurement_delay = MeasurementDelay.DELAY_100MS
20print("Measurement delay is", MeasurementDelay.string[ltr.measurement_delay])
21print("")
22while True:
23    print("UV:", ltr.uvs, "\t\tAmbient Light:", ltr.light)
24
25    # for shorter measurement delays you may need to make this sleep shorter to see a change
26    time.sleep(1.0)

Measurement threshold example

Be alerted when the measured value passes a high or low threshold

examples/ltr390_alert_test.py
 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()
12ltr = LTR390(i2c)
13
14ltr.high_threshold = THRESHOLD_VALUE
15ltr.enable_alerts(True, UV, 1)
16
17while True:
18
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)