ELEC3300_05_stu

ELEC3300_05_stu - ELEC 3300 Microprocessor Applications...

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ELEC 3300 : Fall 11/12 Tim Woo 1 ELEC 3300 Microprocessor Applications Topic 5 Digital and Analog Interfacing, Motor Interfacing Digital and Analog Interfacing, Motor Interfacing Prof. Tim Woo Prof. Tim Woo
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ELEC 3300 : Fall 11/12 Tim Woo 2 Where we are Timer and Counter Basic Computer Structure Introduction to Microprocessor-based Systems Digital and Analog Interfacing Interrupt Organization Memory, Interfacing to Memory, Memory Timing and applications Motor Interfacing Buffering and Direct Memory Access (DMA) Interfacing LCD Other Serial Bus Interface: IEEE1394, USB, I2C and SPI Serial Communication and RS-232 Standard To be covered In progress Done Microcontroller Structure A/D Port Assembler Instruction Set Architecture Memory I/O System CPU Serial Port External Memory Port Interrupt Port Simple Port In this course, 8051 is used as a driving vehicle for delivering the concepts.
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ELEC 3300 : Fall 11/12 Tim Woo 3 • On successful completion of this topic, you will be able to – Describe the basic concepts of Analog-to-Digital Conversion (ADC) and Digital-to-Analog Conversion – List the different types of motors and their characteristics – Implement the drivers for motors interfacing with microprocessor • Pulse Width Modulation (PWM) for driving DC motor without the use of DAC circuitry • Operation Principles for driving a stepper motor Expected Outcomes Expected Outcomes
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ELEC 3300 : Fall 11/12 Tim Woo 4 To control and react to the environment, we need to interface the microcontroller to peripheral devices Things we want to measure or control – Light, temperature, sound, pressure, humidity, etc Sensor and actuators – Switches, photo resistors, phototransistors, etc – Motors, LEDs, relays – G-sensors Embedded software Microcontroller – Executes software – May contain specialized interfaces to sensors and actuators Controlling and Reacting to the Environment Controlling and Reacting to the Environment
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ELEC 3300 : Fall 11/12 Tim Woo 5 A Typical Embedded System A Typical Embedded System
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ELEC 3300 : Fall 11/12 Tim Woo 6 Map analog inputs to a range of binary values – Consists of two buildings blocks : sampler and A/D converter – For rapidly changing input signals, a sample-and-hold (S/H) circuit is followed by sampler. – Most A/D chips have built-in S/H circuitry – The greater the number of bits provides the better accuracy – Sampling time T should be greater than that of A/D conversion time Analog Analog - - to to - - Digital Conversion Digital Conversion A/D converter 0V 5V 2.5V - 2.5V - 5V
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ELEC 3300 : Fall 11/12 Tim Woo 7 Typical value of voltage at the output of sensor ranges from μ V to mV Is it suitable to be the input signal of A/D converter ? Suggested solution: Using a voltage level scalar
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ELEC3300_05_stu - ELEC 3300 Microprocessor Applications...

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