UV 3 click is an advanced ultraviolet (UV) light sensor with I2C protocol interface. The click carries VEML6070 UVA light sensor designed by the CMOS process. UV 3 click runs on either 3.3V or 5V power supply.

VEML6070 sensor features

VEML6070 is an advanced ultraviolet (UV) light sensor with I2C protocol interface and designed by the CMOS process. The active acknowledge (ACK) feature with threshold windows setting allows the UV sensor to send out a UVI alert message.

VEML6070 incorporates a photodiode, amplifiers, and analog/digital circuits into a single chip. VEML6070???s adoption of Filtron??? UV technology provides the best spectral sensitivity to cover UV spectrum sensing. It has an excellent temperature compensation and a robust refresh rate setting that does not use an external RC low pass filter. VEML6070 has linear sensitivity to solar UV light and is easily adjusted by an external resistor.

Specifications

Pinout diagram

This table shows how the pinout on UV 3 click corresponds to the pinout on the mikroBUS??? socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	ACK	Acknowledge pin
	NC	3	CS	TX	14	NC
	NC	4	SCK	RX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C digital serial clock input
	NC	6	MOSI	SDA	11	SDA	I2C digital serial data output
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Jumpers and settings

Programming

Code examples for UV 3 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code reads the value of UV light from VEML6070 and sends it to the user via UART.

01 char uartTxt [20];
02 
03 void systemInit()
04 {
05     Uart5_Init (9600);
06     Uart5_Write_Text ("rnInitializing...");
07     I2C2_Init( 100000 );
08     Delay_ms (100);
09     UV_3_initDriver (0x70,I2C2_Start, I2C2_Stop, I2C2_Write, I2C2_Read);
10     VEML6070_Init();
11     Uart5_Write_Text ("rnInitialized");
12 }
13 
14 void main()
15 {
16     systemInit();
17 
18    while( 1 )
19     {
20           Uart5_Write_Text ("rnUV value: ");
21           IntToStr (UV_3_read(), uartTxt);
22           Uart5_Write_Text (uartTxt);
23           Delay_ms (750);
24     }
25 }