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  • 1.
    Adeboye, Taiyelolu
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Robot Goalkeeper: A robotic goalkeeper based on machine vision and motor control2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report shows a robust and efficient implementation of a speed-optimized algorithm for object recognition, 3D real world location and tracking in real time. It details a design that was focused on detecting and following objects in flight as applied to a football in motion. An overall goal of the design was to develop a system capable of recognizing an object and its present and near future location while also actuating a robotic arm in response to the motion of the ball in flight.

    The implementation made use of image processing functions in C++, NVIDIA Jetson TX1, Sterolabs’ ZED stereoscopic camera setup in connection to an embedded system controller for the robot arm. The image processing was done with a textured background and the 3D location coordinates were applied to the correction of a Kalman filter model that was used for estimating and predicting the ball location.

    A capture and processing speed of 59.4 frames per second was obtained with good accuracy in depth detection while the ball was well tracked in the tests carried out.

  • 2.
    Bergroth, Simon
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Implementering av MPPT-enhet med återkoppling: avsedd för solceller2019Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
  • 3.
    Johansson, Gustav
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Grunden till en simulering av batterier och batterisystem2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 4.
    Shi, Jianan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Design and Implementation of an Alcohol Meter2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With the development of economy, more and more cars appear in the roads. Many drivers ignore thedanger about driving after drinking so that drunk driving causes a large number of traffic accidents allaround the world. By now, alcohol has killed a lot of people in the world. To reduce accidents causedby drunk driving, make certain the alcohol content in driver's body would help a lot, and it is related toalcohol concentration measuring and relevant instrument.In this thesis work, the design of a simple alcohol meter was present. The designed system iscomposed of a gas sensor (TGS-822) working circuit, microcontroller PIC16F690 and LCD display.The system collects the electronic signals caused by resistance changes in gas sensor (TGS-822) froma built-in Analog-to-Digital Converter (A/D) in microcontroller PIC16F690, programs withPIC16F690, and displays alcohol concentration in LCD display finally. The measuring concentrationrange of the designed alcohol meter is from 50PPM to 5000PPM. This paper describes the datacollection, processing and display of the designed alcohol meter in detail. And lastly, the authordiscussed about the advantages and disadvantages of the designed alcohol meter, it could beconsidered as a guideline for further work.

  • 5.
    Unosson, Erik
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Arrival control of TFT displays2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Displays to be used in display computers for vehicles and machines in critical environments shall be possible to inspect regarding pixel defects. The main part of the goal was to realize a test equipment so that different colours can be visualized on displays of different resolutions and interfaces, with a minimum startup time. The inspection of the displays will be visual.

    One pixel is consisting of three sub-pixels: red, green and blue, each controlled by a Thin Film Transistor (TFT). If some TFTs are broken, different types of pixel defects occur. There is an ISO standard defining classes for how many defects of each type that can exist on a display before it should be replaced by the supplier. But other limits can be agreed between supplier and customer. To be able to see the different types of pixel faults, 5 different colours should be shown on the display: red, green, blue, black and white.

    A list was supplied containing 10 different models of display elements for which tests should be possible. They were thoroughly analyzed regarding their technical data for resolution and interfaces for backlight and video signals. The displays are of 3 different resolutions. 5 displays have backlight of the older technology Cold Cathode Fluorescent Lamps (CCFL) which means neon light from tubes, while 5 have the later technology Light Emitting Diodes (LED). 2 of the displays receive the video signals in parallel, while 8 receive them via Low Voltage Differential Signaling (LVDS). The LVDS connector showed to have a special pin configuration for 2 of the 8 LVDS displays. This was the most important discovery, because if the standard LVDS cable would have been used from the carrier board, the displays would probably have been damaged. Because of these differences different types of boards and cables had to be used, both standard parts and modified, to be able to supply the different display models with backlight and video signals.

    To achieve the main part of the goal an existing display computer was modified and used as the base platform for a prototype test equipment. All signaling to the display had to be generated by the FPGA instead of the CPU module. The FPGA project was written in VHDL language. The project included six different modules of which some were written from scratch, some were reused and some were partly reused from an already existing FPGA project. Display resolution is set with a jumper and the 5 colours are visualized in a loop, using a push button.

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