JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

2026-09-05T22:30:20Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

Neue Seite

__NOINDEX__
'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The Waveshare UV Sensor (C) is an I2C expansion board with the LTR390-UV-01 chip that measures ultraviolet and visible light. The 27 × 20 mm board outputs digital light-intensity values over I2C and provides programmable interrupts with upper thresholds.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20467 WSAL20467 – Digital LTR390-UV Ultraviolet Sensor (C), Direct UV Index Value Output, I2C]

== Technical overview ==
* Sensor chip: LTR390-UV-01, a low-voltage I2C ambient light sensor (ALS) and UV light sensor (UVS) in a 2 × 2 mm package.
* Operating voltage: 3.3 V or 5 V; the board includes a level-conversion circuit for both voltages.
* Sensor response range: 280–430 nm; fixed aperture of 2.0 mm.
* Fixed I2C address: 0x53.
* The board has four connections: VCC, GND, SDA, SCL, plus an additional INT pin for interrupt output.
* The chip converts light intensity directly into a digital output signal transmitted over I2C.
* Programmable interrupts with hysteresis reduce the need for polling and improve system efficiency.
* Sample programs are available for Raspberry Pi (Python), Arduino (INO demo), and STM32 (NUCLEO-F103RB).

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz
tar zxvf bcm2835-1.60.tar.gz
cd bcm2835-1.60/
sudo ./configure
sudo make
sudo make check
sudo make install
sudo apt-get install wiringpi
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
sudo apt-get install p7zip-full
wget https://files.waveshare.com/upload/a/ab/UV_Sensor_C_Code.7z
7z x UV_Sensor_C_Code.7z -r -o./UV_Sensor_C_Code
sudo chmod 777 -R UV_Sensor_C_Code
cd UV_Sensor_C_Code/RPI
sudo python LTR390.py
</syntaxhighlight>

== Notes and version constraints ==
* Pin assignments must be followed exactly: VCC, GND, SDA, SCL, and INT. Swapped SDA/SCL wires will prevent data exchange.
* For all three platforms (Raspberry Pi, Arduino, STM32), verify the hardware connection before running the program.
* The Raspberry Pi demo uses Python; ensure required libraries are installed.
* For Arduino, the Waveshare_UV_C library must be placed in the Arduino directory so it appears in the IDE.
* On the STM32 platform, the example was verified on NUCLEO-F103RB; other boards require adjusted pin mappings.
* If only a short message prints after power-on or all values read zero, re-check the wiring (especially SDA/SCL order) and reconnect the sensor.

== Source and revision record ==
* [https://www.waveshare.com/wiki/UV_Sensor_(C) UV Sensor (C) - Waveshare Wiki]
* Source revision: 69243
* Captured: 2026-09-02T03:52:48+00:00
* SHA-256: <code>56f2f7ee1ce17c85d1d548a5c9ebc0403b8954312c2faf8b30848509058fbf6d</code>

WSAL20467 – UV Sensor (C)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex