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Abstract

The Solar Splash is a competition between different universities, each competing using a boat that is solely powered by solar energy. USI participated in their first competition this past summer. Tlie goal for this project is to design and construct an onboard instrumentation system, utilizing the Galileo microcomputer board. Using a variety of sensors and an LCD screen connected to the Galileo board, the system displays measurements such as voltage, current, motor speed, temperature, and ambient light. The voltage displayed is the measurement of the DC voltage across the battery bank which powers the motor. This is the most important reading because if the batteries are not outputting a high enough voltage, the motor's operation will be impaired. The current measurement is the DC current going from the battery bank to the motor. It is measured using a shunt resistor and an instrumentation amplifier. Knowledge of the current is needed to avoid damage to cables or other equipment. The speed measurement is based on the revolutions per minute at which the motor is rotating. This measurement is intended to provide a sense of boat speed, which should be proportional to shaft speed. Knowing this, if a high voltage is applied to the motor and a low speed is measured, it indicates there is something wrong with the motor. The temperature sensor will be placed near the battery bank to monitor the heat the batteries are producing. When the system is displaying the temperature reading and this reading surpasses a predetermined temperature, the LCD changes from a blue backlight to the red backlight, as a warning. The light sensor measures the ambient light, in lux, that the solar panels should be receiving. This measurement allows the user to see how efficiently and effectively the solar panels are collecting the obtainable light. It also allows the user to get an idea of how well the batteries are charging. All of these measurements were not able to be tested using the actual battery bank and motor, but they were able to be simulated using a power supply to simulate the batteries and a DC machine to simulate the revolutions of a motor—excluding the current measurement because the parts did not arrive on time. The simulated measurements gave promising results and when the Galileo board is tested with the boat hardware there will be almost no change to the code.

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