UV Sensor (C)
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Overview
V Sensor (C) is an I2C digital UV sensor expansion board equipped with LTR390-UV-01, which can be used to measure UV and human visible light and can output light intensity data. UV Sensor (C) has the characteristics of sensitive sensing, fast response, and small size. Its core sensor LTR390-UV-01 is integrated on an expansion board (27 × 20mm), which can be easily integrated into the device.
Product Features
- Using LTR390-UV-01, can measure ultraviolet and visible light of the human eye.
- Built-in ADC, can directly output light intensity through the I2C interface, not easy to be disturbed by noise.
- With interrupt output and programmable upper and lower thresholds.
- On-board level conversion circuit, compatible with 3.3V/5V working level.
- Provide complete supporting information manual (Raspberry/Arduino/STM32 sample program and user manual, etc.)
Specifications
- Operating voltage: 3.3V/5V
- Sensor: LTR390-UV-01
- Response wavelength: 280 - 430nm
- Communication interface: I2C (fixed address: 0 x 53)
- Product size: 27 × 20mm
- Fixed aperture: 2.0mm
Applications
- Ultraviolet tester
- Outdoor ultraviolet detector
- Germicidal lamp
Interface Description
- Pin function
| Pin Number | Identification | Pin Description |
| 1 | VCC | 3.3V/5V power supply positive |
| 2 | GND | Power Ground |
| 3 | SDA | I2C data line |
| 4 | SCL | I2C clock line |
| 4 | INT | Interrupt output |
Hardware Description
Chip
This product adopts the LTR-390UV-01 UV sensor, which is an integrated low voltage I2C ambient light sensor (ALS) and UV light sensor (UVS), using a single microchip (2 x 2mm) lead-free surface mount package. The sensor converts light intensity into a digital output signal that can be directly used with the I2C interface. It provides a linear ALS response over a wide dynamic range, making it ideal for applications in high-brightness environments. The sensor has programmable interrupts with a hysteretic response to events, eliminating the need to poll the sensor for readings, and improving system efficiency.
Communication Protocol
I2C communication requires a data cable and a clock wire. Normally, the I2C bus has three signals during transmission: start, end, and response.
Start signal: When SCL is at a high level, SDA transitions from a high level to a low level to start transmitting data.
End signal: When SCL is at a high level, SDA transitions from a low level to a high level, ending data transfer.
Response signal: After receiving the 8-bit data, the IC that receives the data sends a specific low-level pulse to the IC that sends the data, indicating that the data has been received.
Hardware Description
Chip
This product adopts the LTR-390UV-01 UV sensor, which is an integrated low voltage I2C ambient light sensor (ALS) and UV light sensor (UVS), using a single microchip (2 x 2mm) lead-free surface mount package. The sensor converts light intensity into a digital output signal that can be directly used with the I2C interface. It provides a linear ALS response over a wide dynamic range, making it ideal for applications in high-brightness environments. The sensor has programmable interrupts with a hysteretic response to events, eliminating the need to poll the sensor for readings, and improving system efficiency.
Working with Raspberry Pi
This demo uses a Raspberry Pi 4 Model B, which provides RPI (Python) library demos.
Hardware connection
Enable I2C interface
- Execute in terminal:
sudo raspi-config #Select Interfacing Options -> I2C -> yes to start the i2C kernel driver.
- then restart the raspberry pi:
sudo reboot
Installing Libraries
- Install BCM2835, open the Raspberry Pi terminal, and run the following command
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
- install wiringpi
sudo apt-get install wiringpi #For Raspberry Pi 4B may need to be upgraded: cd /tmp wget https://project-downloads.drogon.net/wiringpi-latest.deb sudo dpkg -i wiringpi-latest.deb gpio -v
Download and run the test demo
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
python program
Execute in the UV_Sensor_C_Code directory:
cd UV_Sensor_C_Code/RPI sudo python LTR390.py
- Note: The sensor has 2 working modes, measuring light intensity and UV light respectively.
- Note: The upper and lower thresholds of the interrupt are set by the program. If it is higher than or lower, it will trigger, and the INT pin will output a high pulse.
Working with STM32
This demo has been verified on NUCLEO-F103RB (chip model STM32RBT6). If you need to transplant, please pay attention to the relevant configuration and connection method.
Hardware connection
Connection with XNUCLEO-F103RB:
| UV Sensor (C) | XNUCLEO-F103RB |
| VCC | 3.3V/5V |
| GND | GND |
| SDA | SDA/D14/PB9 |
| SCL | SCL/D15/PB8 |
Experimental phenomenon
The default serial port 2 prints data, and using a UV lamp or UV pen to illuminate the sensor will print the UV value
Working with Arduino
This example is tested on Arduino UNO. If other types of Arduino are used, please pay attention to whether the relevant pins are connected correctly.
Hardware connection
Install and compile the software (windows tutorial)
Verifiers
Download the demo on the product encyclopedia interface, and then unzip it.
This demo is written based on the Arduino library version, so the program needs to be copied to the Arduino library directory.
Copy the folder Waveshare_UV_C in the Arduino directory in the next week's file to the libraries in the Arduino installation directory (C:\Users\XXX\Documents\Arduino\libraries or C:\Program Files (x86)\Arduino\libraries)
Open Arduino IDE: Click File (file) -> Example (example) to load the library, and check if there is the Waveshare_UV_C option, if so, the library is imported successfully
Open the ino project file in the example, select the corresponding model of the development board, select the corresponding COM port, compile the program, download it to the UNO, open the serial monitor, and use the UV pen or UV lamp to print the UV value.
Resources
FAQ
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Support
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