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Mardreagus Williams Electrical Engineer -Electrical Subsystem Design - Hardware Design

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Power of Ra

ConstraintsDescription Power RequirementsThe solar panel must be coupled with a battery to function during night time usage and instances or periods without adequate sunlight. Battery ProtectionThe battery must be protected from deeply discharging and overcharging according to predetermined specifications provided by the manufacturer Output PowerThe unit must be able to output a range of power from 10W to 40W. User InterfaceThe user interface must display when charging station has power available, the user’s remaining charge time, and whether the station is in normal operation or a low power state. Secure EnclosureThe charging station must provide a secure enclosure for users to leave a device unattended while charging

CategoryNameDescription EnvironmentalWeatherproofingCharging station must be able to operate in areas where precipitation is likely to occur. Health and SafetyProtectionWires must be properly insulated and the battery must be inside an enclosure.

Charge Controller Battery DC Power DC/AC Inverter AC Power Microcontroller User Interface [7] [8] [9]

Card Reader Monitor Keypad

3.05 inches

Implementation of a second security box that will accommodate another user The second security box will only accommodate cell phones

Added a limit switch to determine if the security box is open/closed The station will give a sound to notify the user has left the security box open after a session

Battery Status12 Volt Battery Arduino Critical11.5V3.66V Critical12.0V3.71V Okay12.5V3.86V Okay13.0V3.93V

Current (Amps) System Consumption0.7 (700mA) Charger controller0.006 (6mA) Magnetic Lock0.060 (60mA) Total0.766 (766mA)

August Software Improvements PCB Design September Ordered Remaining Parts for PCB Hardware Improvements October Populate PCB Start Testing November Finalize Testing Complete Final Design