Preliminary Design Report. Project Title: Search and Destroy
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1 EEL 494 Electrical Engineering Design (Senior Design) Preliminary Design Report 9 April 0 Project Title: Search and Destroy Team Member: Name: Robert Bethea bbethea88@ufl.edu Project Abstract Name: Felipe Freire freirefv@ufl.edu Our project consists of building a robotic turret that will search for a designated target using image processing and automatically or manually destroy it. This design has two main parts: PC-side and Camera-side. The Camera-side will have the camera, a pointing mechanism (laser) on top of a rotating (left, right, up and down) device, and a microcontroller (MCU). The camera MCU will control camera input and rotating the device. The camera will get the image and send it through a serial port connected to the microprocessor. The PC side of the project will run the shape detection program and send the coordinates of the specified shape back to the camera side processor. The image processing software we will be using is all taken care of in MATLAB. We decided that because we were already familiar with the program, and it had an onboard image processing toolbox it would be the simplest tool to implement with our design. It also has a simple GUI creation tool.
2 Table of Contents Project Features...3 Technical Concepts...3 Hardware....4 Software....7 Distribution of Labor... Project Timeline... Parts List.. Appendix A..3 Appendix B..3 List of Figures. Project Block Diagram...4. Microcontroller Pinout Camera Camera Layout Circuit Diagram BMP File Servo Timing Diagram Processed Image Gantt Chart of Timeline... 0.Parts List..PCB Layout 3-4.Project Images..3-4
3 Primary Features/Objectives In the Search and Destroy senior design project, there are four main objectives that will be accomplished upon completion.. The turret and host computer will communicate serially.. The program will accept a target input from the user. 3. The camera will acquire the target. 4. The turret will eliminate the target. We are going to communicate serially between the turret and computer. We will use a RS-3 breakout board to accomplish this portion of the project. This part was very simple to implement to the microprocessor and PC. This option was chosen over wireless because we could not get a fast enough data transfer rate to get the image from the camera to the PC. The next feature of our project design is the turret will accept a target input from a user. We made a simple GUI in MATLAB to accomplish the feat. The only action the user has to take is press the button of which ever target they want to target. The image processing program will take care of the rest of the steps. The third feature we will implement to our design project is the turret will be able to locate the target without user control. We accomplished this feat with writing some image processing software in MATLAB. We decided to focus on targeting shapes instead of more detailed images because neither of us had any image processing experience. The final feature of our design project is the elimination of the desired target. In order for this to happen, the turret will need to be able to move both side-to-side and up and down. For this portion of the project to be deemed successful, the laser must hit the target in some way. Technical Concepts This section is divided into two parts: hardware and software design. The hardware design describes the functions and the connections between the components of the system. The software design section describes the rules and protocols that handle wireless transmit/receive and turret operation. The host software design section describes the PC GUI program that handles user commands and video image processing.
4 Hardware design Figure The above figure shows the hardware flowchart. The MCU used is the Atmel ATmega84p and the camera used is the C3088 video camera with Omnivision OV660. All the components will be group into two parts: PC- side and cameraside. The MCU will control the turret and camera. The camera s data is sent out through its output pins to the GPIO s ports of the MCU. The MCU gets the data the sends it through the serial connection to transmit the data to the PC. Reading and writing to the camera s registers will be done through IC.
5 MCU Figure The Atmega84p was chosen because of its large SRAM capacity (6KB) which makes buffering of data easier. It s a low power CMOS 8-bit microcontroller. We decided not to use the internal clock of this processor because it simply was not fast enough for data transfer. We went with a 0MHz external clock instead. Camera The color camera operates at a voltage of 5V. It is capable of taking reasonably high resolution images at 0,376 pixels. All camera functions, such as exposure, gamma, white balance, color matrix, are programmable through IC interface. The camera has 3 pins in a by 6 pin design. A standard x6 ribbon cable will be used to interface camera to camera s PCB design. Figure 3
6 Figure 4 Power Supply We will not use any external power supply. The 5V we need to operate the circuit will all be supplied through the USB port of the PC. We decided to do this because of its ease and simplicity. Circuit Diagram Figure 5 Figure 5 shows the circuit design we used to create the PCB. The PCB layout is shown in the appendix section.
7 Software design The software design of the project will have the embedded software of the PC side and camera side. The PC-side embedded software sends a command to the camera-side embedded system to request for data. This command activates the camera and initiates the broadcast of image data via serial port. PC-side embedded system transmits video data to the PC host software to be processed after it receives it. PC host software process data images to find a specific target, then it send its position to turret to acquire the target. We used AVR studios and MATLAB for our programming platforms. Camera Software: USART One of the first things that were designed was the communications between the Camera s board and the PC. This was important to set up first because it was used to test and troubleshoot by sending error messages to the computer. Port settings were designed to be: 8 data bits, stop, 0 parity, 500 bps and flow control none. On the PC two text terminals were used: Real Term and Hyper-terminal. Everything could have been done with Hyper-terminal, but for reasons that I could not understand I was not able to open BMP files after getting them from the camera. That s why I used Real-Term, open source software. On the Camera s board, a generic code from AVR USART library for GCC was used. The algorithm was modified to fit the requirements for this project. The two main functions of the header file USART.H are: sending (no buffer) and receiving (buffer with interrupt). IC Comm The cam module, CMOS C3088, uses IC (Inter-Integrated Circuit) protocol for communication. This protocol uses one pin for the clock and the other for data and a Master- Slave design. The most difficult part of this project was to figure out a way to write to and read from the cam s registers, which was a requirement to control cam s functionalities. The problem was that the Atmega84p does not implement IC protocol. Two solutions were thought out: IC hardware converter or some kind of software that would emulate the IC protocol. Second solution was selected because it was easier to implement as the Atmega84p uses a synchronous TWI (Two Wire Interface) protocol which with some modifications can emulate IC protocol. The write and read functions are implemented on IC_CAM.H header file. BMP The BMP.H header file was created to send images to the PC. BMP (Bitmap image) file format was select for its simplicity to implement. After sending the headers of the BMP file, the data (pixel) are sent. This allows sending an image to the PC as it is read from the cam which does not require a buffer to store the data on the chip. BMP file structure:
8 BMP File (figure 6) To get an image from the cam, the timing diagram from the cam s datasheet was followed. The clock frequency of the cam (PCLK) runs to about 8MHz and the Atmega84p to 0MHz using external crystal oscillator. This was not a big problem using delays to make sure both hardware works to the same frequencies. There are two ways to read an image from the cam: horizontally and vertically. Vertical Mode was chosen for it allowed a higher frequency to be used. The only problem with vertical mode is that to get an image we need to read as many frames as to vertical lines. Servos Two servos were used to control the horizontal and vertical movement of the camera. The main function of the two servos was: tracking and pointing a given object. The position of the servos is control by the width of the periodic pulse as shown on fig 7. The specific values were found by testing and the use of the oscilloscope. All the pins and set up timings can be found on the header file SERVOS.H
9 Servo Timing Diagram (figure 7) Main In the Main function (source file) is where all the magic takes place. Here is where the serial communication (USART.H) and the TWI (IC_CAM.H) protocol are initiated and most of the hardware (chip s pins) configuration set up. The program sends a welcome message to the PC and then it goes to an infinite while loop waiting for user s command input. The source file has a function call read-line which reads user s input coming from the serial port chosen. Then the input is compared to the commands hardcoded on the chip. If the input is correct or wrong, it will output an acknowledgment based on the input. Image processing Software All the image processing was done in MATLAB. The image processing toolbox was used frequently to process the image. The purpose of the image processing in our project was to identify and locate the coordinates of the user specified target. The targets we are trying to identify are three different shapes (circle, square, rectangle).
10 Identifying the Shapes To identify a shape, the quality of their roundness was used. The following equation was used to find a ratio of how round the object is. ( ) The above equation works by giving each object in the image a ratio. The closer the object s ratio is to, the rounder the object is. For our project s images, circles tended to have ratios greater than.65. Squares had ratios that ranged between.45 and.6, and rectangles had ratios between.3 and.44 Locating the Shapes To locate the shape, a GUI was created within MATLAB. Buttons were made with the name of each shape as the text on the button.. If an object was found to have a roundness ratio within the parameters of the button the user selects, the program will get the central point of that shape and send those coordinates to the MCU. Figure 8 Figure 8 shows the program after it has been told to find the circle in the captured image.
11 Distribution of Labor Felipe Freire: -Hardware design -Camera Software design -Object Acquisition/Targeting -Serial Communication Robert Bethea: -Hardware design -Image processing Software design -Serial Communication -PCB design Gantt chart: This is an estimated timeline of the project s completion. Figure 9
12 Parts List Part Price Camera Module $50.00 Pan and Tilt Servo Kit $9.00 Atmega 84p $8.3 RS-3 $0 0 MHz ext. clock $.50 Resistors/Capacitors $0 Packaging $5.00 Total: $0.63 Figure 0
13 Appendix A: PCB layout Figure Appendix B: Project Images Figure
14 Figure 3 Figure 4
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