The iPad as a tool for simulation and sensing
Kandappan Singaravadivelu, Sivakumar
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In this era, mobile devices have undergone a tremendous revolution with powerful microprocessor and durable batteries. We have harnessed the enormous power of the iPad to create an electrical simulator which can run SPICE based simulations on non-linear circuits. We have also created micro power sensors that are compatible with, and can be powered by the mobile devices. The multi-touch feature available in the device is used to create natural user interface that is intuitive to the user. The simulator is developed with the help of cloud computing services provided by a server which runs a Labview and Multisim program. The iPad is used in the frontend to create and manipulate the circuits. A SPICE based netlist with nutmeg commands is created for each circuit. The file containing the SPICE deck and nutmeg commands is transferred to the server running the Labview and Multisim program using File Transfer Protocol (FTP). The Labview program initiates the Multisim program to simulate the circuit listed in the SPICE netlist file. The simulation results are then transferred back to the iPad and displayed in text format. A low power CMOS compatible ear thermometer that can be powered by the iPad is also developed. The thermometer can sense the human body temperature and generate a voltage corresponding to the temperature. The generated voltage can be read through the iPad microphone port. A novel idea of integrating an external accelerometer has been suggested to capture the human interaction without using the touch screen has been proposed. A low power accelerometer with increased sensitivity that is compatible with iPad is designed.