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TCSP – Schematics Design

TCSP – Schematics Design. Major Components. Freescale 9S12A64FCUE Microcontroller Etek EB-85A GPS Receiver Electronic Speed Controller HP Photosmart R707 Digital Camera microSD Card Reader External LCD Interface Melaxis Thermopile based Tilt Sensor LM2679 based Power Supply.

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TCSP – Schematics Design

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  1. TCSP – Schematics Design

  2. Major Components • Freescale 9S12A64FCUE Microcontroller • Etek EB-85A GPS Receiver • Electronic Speed Controller • HP Photosmart R707 Digital Camera • microSD Card Reader • External LCD Interface • Melaxis Thermopile based Tilt Sensor • LM2679 based Power Supply

  3. Block Diagram

  4. Microcontroller Decided on using a Pierce configuration for oscillator circuitry due to better performance and less circuitry as compared to Colpitts configuration. Design was taken directly from manufacturer’s recommended layout. Operating frequency will be set at 8 MHz via crystal oscillator.

  5. Direction Controllers Quad Servo Directional Control Four servos Controlled via PWM through MCU during automated flight. System Consists of four servos to control Rudder, Elevator and Ailerons. Connects to MCU over a level translator to acquire a suitable voltage. Melaxis Thermopile based Tilt Sensors Circuitry consists of a set of two thermo radiation sensors connected to a differential amplifier. Two sets are used for X and Y axis. Voltage is re-biased using an LM741 to suitable levels for MCU.

  6. Imaging Interfaces Etek EB-85A GPS Receiver Connects to the MCU via SCI interface. Uses 2 SCI enabled Pins. Provides GPS Location, Altitude, Velocity and Bearing. HP Photosmart R707 Digital Camera Triggered via the MCU when target GPS Coordinates are reached. Uses 5 General IO Pins. Uses a ULN2003A Darlington Transistor array to trigger voltage low.

  7. External Interface microSD Card Interface Used to store GPS coordinates. Interacts using SPI connection on MCU via 5V to 3.3V level translators. External LCD Interface Used for diagnostic purposes, connects to the system via an SCI interface.

  8. Power Supply and ESC LM 2679 Power Supply Uses LM2679SD-3.3 and LM2679SD-5.0 regulators. Will converted 11.1V DC from 3 cell Li-Po batteries to a stable 3.3V and 5.0V at 92% Efficiency. Electronic Speed Controller Regulates the speed of the motor based on a PWM signal input into it. Connected PWM pin on MCU during auto flight.

  9. The End

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