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Solar panel
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Output: 5.5V/40mA. Received
energy from sunlight and can produce electricity from a range of frequency
light.
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Voltage comparator (LM339)
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Convert analog signal to
digital signal as convert from the energy to electricity. Because solar panel
voltage is lower than battery voltage, simple boost converter will be
sufficient. It is also to compare two analog signals and produce a one bit
digital signal.
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Battery
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1000 - 1300 mA-hrs.
Battery charger used to put energy into a secondary cell or rechargeable
battery by forcing an electric current through it.
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Voltage/Current sense circuit
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Sense circuit measures
panel and battery voltage and current. Accurate measurement is required for microcontroller
(PIC16877A) tracking
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Load control and monitoring
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Overload protection. It
also disconnects the load if the battery is depleted
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System power supply
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Regulated 3.3V power
supply. Most of the system components are powered by 3.3V
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PIC16877A, microcontroller
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Microcontroller that
implements MPPT algorithm, controls voltage comparator and displays system
information at LCD.
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LCD, System information display
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Shows current system
state on the LCD display. Solar panel power, level of battery charge, load
power and other information.
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