Transcript Preliminary Schematic

RECON ROBOT
ECE 477 Group 8
Vinit Bhamburdekar
Arjun Bajaj
Aabhas Sharma
Abhinav Valluru
Theory of Operation
PIC32 MCU
The MCU has a frequency of 80 MHz with an operating voltage of +5V. Will be using a
number of I/O pins, 3 PWM interfaces, 1 SPI , 3 channels of ATD and 1 UART if the
wireless transceiver is changed.
H-Bridge
The component allows a maximum of two motors to run in both directions. The PWM
inputs help in regulating the speed of the motors. Will be used to control the rear wheel
and front wheel motors. Takes an input of 5V for operation and also an input for motor
voltage is required, in this case 9V.
DC – DC Converter
Not every component in the project runs on the same voltage. Since we are using just one
battery to power the entire robot, a need to convert voltage to the required value was to be
achieved. This can be done using a DC-DC Converter which in our case is converting 9V
to 5V.
Theory of Operation
Coulomb Counter
The coulomb counter will be used to determine the battery life remaining on the robot.
This works in conjunction with the transceivers as the value calculated needs to be sent
back via the transceivers to the base.
Servo Motor
The Servo motor will be attached to a plate, thus serving the purpose in making a movable
plate, on which the camera will be mounted. The motor uses a PWM input thus
controlling the speed of the camera’s movement.
Battery
The battery outputs 9V DC with a max current of 700 mAh. The battery will be used in
conjunction with the DC converters and the coulomb counter.
Theory of Operation
Sensors
The project utilizes two sensors to detect obstacles. The Ultrasonic sensor is being used to
detect obstacles right in the front of the robot. Depending on the distance between the
obstacles, the voltage output begins to change as the sensor moves away or closer to the
obstacle. Using a threshold voltage, the obstacle can be detected at a particular distance
and thus can be avoided. The infrared sensor works in the same way but is used for
pothole detection.
GPS Chip
The GPS chip utilizes a built in antenna to connect with a satellite. Upon getting data the
chip serially accumulates the data into a packet and sends it out. The output is then routed
to the ADC of the MCU in order to be decoded into readable coordinates.
Transceivers
The transceivers chosen are connected to the MCU to route data back and forth from the
base. They have a 2.2 – 3.8V of operation. Will be interfaced with the MCU through SPI.
Operate on radio frequency of 2.4Ghz.