June Birth Magoncia

user Electronics Engineer

city Innovuze Solutions, Inc.

  • SUF268J001 Based Solar Radiation Sensor

  • Created: Apr 25, 2016

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The SUF268J001 is a single solar sensor that measures the intensity of solar radiation emitted by the sun. It is made from a single photodiode cell that can give electric information proportional to the intensity of the solar radiation it senses. The device is 100 percent sensitive to a light that has a wavelength of 925nm, but it has a spectral range of 400nm up to 1100nm. It outputs current linearly with respect to the intensity of solar radiation. The SUF268J001 has a maximum current output of 0.4mA at an intensity of 767.4W/m2.

The current output of SUF268J001 depends on the intensity of the solar radiation. In this reference design, the SUF268J001 device acts as a current source input to the operational amplifier U3 that is configured as a current to voltage converter. The output voltage of U3 is equal to the output current of SUF268J001 multiplied to the resistance of R3. The maximum output of U3 is approximately 4.84V when SUF268J001 output current is 0.4mA and solar radiation intensity is 767.4W/m2. The output of U3 is sent to the ATmega328 microcontroller through the analog-to-digital converter pin PC0. The ATmega328 microcontroller reads the analog output of the operational amplifier U3 and converts it into a digital value. Based on the reading, the microcontroller will display the equivalent solar radiation intensity on the LCD screen. The ATmega328 microcontroller also prints the solar radiation intensity serially through its USART pins (PD0 and PD1), which is connected to the male pin header J1. This can be read by external microcontrollers to do other tasks based on the intensity of the solar radiation.

The design runs with a 5V power supply. The whole circuit consumes less than 5W of power. This SUF268J001 based solar radiation sensor reference design can be used in HVAC systems wherein compensation of solar radiation is needed. For example, it can be used to control the air conditioning system of a vehicle so that it automatically adjusts the air temperature depending on the amount of light entering into the vehicle.