UVB Click is ultraviolet sensing board based on GUVB-C31SM sensor from GenUV, capable of measuring UV index between 0 to 16. UVB Click supports integrated functions of ultraviolet light sensors such that can be easily configured and used in user applications. Overexposure to UVB radiation not only can cause sunburn but also some forms of skin cancer, so knowing amount of UVB light can be quite important and this Click board™ is perfect solution for that task. This board can be used for various application where measuring UV light is needed such as wearable devices, weather stations, bicycle navigation and many more.

UVB Click board™ is supported by a mikroSDK compliant library, which includes functions that simplify software development.

UVB Click based on GUVB-C31SM, a Digital UV Sensor from GENUV Technology. The sensor detects UVB light, as it includes on-chip GaN Sensors for UVB. The current generated by photo detectors is converted and measured by ADC and changed to 16-bit resolution digital data. The measured data can be delivered to host via I2C serial interface. Spectral responsivity of sensor is from 240nm up to 320nm which covers full range of UVB spectrum that's defined as light with wavelength from 280nm up to 315nm.

The atmosphere blocks about 77% of the Sun's UV, of the ultraviolet radiation that reaches the Earth's surface, more than 95% is the longer wavelengths of UVA, with the small remainder UVB. Overexposure to UVB radiation not only can cause sunburn but also some forms of skin cancer. UVB radiation can cause direct DNA damage. This cancer connection is one reason for concern about ozone depletion and the ozone hole.

One of the benefits of UV light is that it causes the body to produce vitamin D (specifically, UVB), which is essential for life. The human body needs some UV radiation to maintain adequate vitamin D levels; however, excess exposure produces harmful effects that typically outweigh the benefits. With all of this in mind it's very useful to know the amount of UVB radiation that you are exposed to, and UVB Click board™ is perfect solution for such purpose, and perfect tool for developing wearable devices or weather stations that can report amount of UVB light intensity.

Since sensor is supplied with 3.3V only, also featured on this Click board™ is voltage level shifter. For the level shifting, the PCA9306 dual bidirectional I2C bus and SMBus voltage level shifter is used. This level shifter IC allows shifting (converting) the I2C signal levels to the voltage level selected by the VCC SEL onboard SMD jumper. This allows both 3.3V and 5V capable MCUs to be interfaced with the UVB Click board™.

• Interface: I²C
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V or 5V
• UVB sensing resolution: 16 bit
• UV index measurement: 0~16
• Spectral responsivity: 240nm - 320nm

• Schematic
• GUVB-C31SM Datasheet
• mikroSDK
• LibStock