1. INTRODUCTION 1.1 EMBEDDED SYSTEM: An embedded system is a special-purpose system in which the computer is completely encapsulated by or dedicated to the device or system it controls. Unlike a general-purpose computer‚ such as a personal computer‚ an embedded system performs one or a few predefined tasks‚ usually with very specific requirements. Since the system is dedicated to specific tasks‚ design engineers can optimize it‚ reducing the size and cost of the product. Embedded systems are often
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Figure 3.8 Schematic Diagram of DDR3 SDRAM 3.7 Watchdog Timer The MAX6748 is a low-power microprocessor supervisory circuits. It is used in this project to monitor Buck-Boost Converter’s output voltage and the situation when microprocessor hangs. The output Reset pin is connected to the SYS_WARMRST pin of the microprocessor. If the Buck-Boost Converter’s supply voltage goes below the preset value or the microprocessor hangs then the Watchdog Timer resets the microprocessor. Figure A.8 shows the top-view
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circuit using a variable resistor in place of fixed resistor R5. The various components used in making clap switch are listed below: - 1. 470R‚ 330R‚ 1K‚ 4.7K & 47K 2. 100nF x (2) & 100mF/10mF 3. BC547 x (2) 4. Electric Condenser Mic 5. 555 Timer 6. LED 7. 9V Battery The circuit diagram of clap switch is as follows: - The pin configuration of 555 IC used in
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the importance of coordinated teamwork and project management. • To appreciate the nature of systems design. The requirements of our assignment are listed below: • resistors: 470 × 3‚ 22k‚ 100k • 555 timer IC‚ such as NE555 • capacitors: 0.1μF‚ 1μF 16V radial‚ 10μF 16V radial • 4017 counter IC • diodes: 1N4148 × 6 • LEDs: red‚ amber (or yellow)‚ green • on/off switch • 1M preset‚ horizontal • battery clip for 9V PP3 • stripboard: 20 rows
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CONTROL DEVICES Switch Abbreviations NO (Normally Open) and NC (Normally Closed) represent the electrical state of this switch contacts when the switch is not actuated. Manually Operated Switches - Switch is controlled by hand. - Forms of switches i) Toggle switch (Types of switches:- ➢ Single Pole Single Throw (SPST) ➢ Single Pole Double Throw (SPDT) ➢ Double Pole Single Throw (DPST) ➢ Double Pole Double Throw (DPDT) ( Electrical ratings
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0 5 5 21 15 12 0 0 12 6 5 8 14 25 26 7 7 0 0 5 22 21 0 8 13 11 9 2 25 10 4 7 11 1 0 12 1 6 13 0 11 14 0 6 Discussion: The problem in most of the circuits could have been linked to the 555 timer circuit that was being used as a square wave oscillator to provide a clock pulse. When used in stable mode‚ the 555 acts as a square wave oscillator whose clock rate is dependent on a time constant provided by two resistors and a capacitor. Many of
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Motivational Factors and Differences between Part-time and Full-time Employees of Grameenphone Ltd. – Contact Center Motivational Factors and Differences Between Part-time and Full-time Employees of Grameenphone Ltd. – Contact Center Motivational Factors and Differences Between Part-time & Full-time Employees of Grameenphone Ltd. – Contact Center An Internship Report Presented in Partial Fulfillment of the Requirements for the Degree of Bachelor of Business Administration Motivational
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Description |The coin operated timer for PC by Jhunnies is different and better than the competition because it safely and properly shuts down the | |computer when the timer stops. This also have the following benefits: | |Big savings on electricity bills. When the computer is not in use‚ it is powered off automatically by the coin operated timer for PC. | |Big savings on Internet Bandwidth. When the computer is
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requirements. CHAPTER-1 Microcontrollers: Microprocessors and microcontrollers are widely used in embedded systems products. Microcontroller is a programmable device. A microcontroller has a CPU in addition to a fixed amount of RAM‚ ROM‚ I/O ports and a timer embedded all on a single chip. The fixed amount of on-chip ROM‚ RAM and number of I/O ports in microcontrollers makes them ideal for many applications in which cost and space are
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Practical Applications A countdown timer for examination with minutes and seconds display in which the examiner can adjust the period of time. The time will be display with 3 seven segment display‚ this can be used as a 1 for minute and 2 for seconds or all display for minutes only. The buzzer will alarm every after thirty minutes. This is to jog the memory of the examinees‚ on how much time is left. When the time period is finished‚ another beep from the buzzer would be heard to remind the examiner
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