Category Archives: ECET 365

ECET 365 Week 1 Homework Problems 8.9, 8.10, D8.13, D8.14, D8.15 Updated

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ECET 365 Week 1 Homework Problems 8.9, 8.10, D8.13, D8.14, D8.15 Updated

Page 454-455 

Problems 8.9, 8.10, D8.13, D8.14, D8.15

8.9) A stepper motor has 24 north teeth and 24 south teeth. What angle change occurs on each step?

If a full step is output every 1 ms (and assuming it doesn’t slip), at what speed does the motor spin?

8.10) Draw a figure similar to figure 8.80 showing how half stepping works.

D8.13) Design an interface for a +24 V, 500 mA geared DC motor. The time constant of the motor is

D8.14) Design an interface for a +12 V, 500 mA bipolar stepper motor. There are 200 steps/revolution.Write the software to spin the motor at 1 rps.

D8.15 An alarm is powered by 120 VAC, and the on/off state of the alarm is controlled by an EM relay. Design the interface between a computer output port and the EM relay. The dropout voltage is 3.5 V, and the coil current needs at least 100 mA. Limit the coil voltage to 6 V. Write three software functions: Alarm_Init, Alarm_On, and Alarm_Off.

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ECET 365 Week 1 iLab Motor Control Updated

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ECET 365 Week 1 iLab Motor Control Updated

Objectives

A. Develop software routines that control Stepper Motors, small permanent magnet DC motors, and Servos.

B. Understand how an H-bridge can be used to control DC motors and Stepper Motors.

Questions for the DC Motor Procedures:

Questions for the Stepper Motor Procedures:

Questions for Servo Procedures:

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ECET 365 Week 1 Quiz Updated

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ECET 365 Week 1 Quiz Updated

Question 1. Question : (TCO 3) To allow a relay coil current of 150 mA through an NPN transistor with a gain (beta) of 75, the current through the base must be _____.

Question 2. Question : (TCO 3) A stepper motor requires 250 steps per revolution. How many degrees does the motor rotate per step?

Question 3. Question : (TCO 3) A pulse train consists of a logic 1 pulse that is 30 microseconds wide followed by a logic 0 pulse that is 70 microseconds wide. The duty cycle is _____.

Question 4. Question : (TCO 3) Compare the advantages and disadvantages of using an optical isolator versus using a relay as an interface to an alarm clock circuit.

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ECET 365 Week 2 Homework Problems 7.1, 7.4, 7.9, 7.13, D7.17 and 12.1 – 12.5. Updated

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ECET 365 Week 2 Homework Problems 7.1, 7.4, 7.9, 7.13, D7.17 and 12.1 – 12.5. Updated

Pages 384 – 387, Problems 7.1, 7.4, 7.9, 7.13, D7.17.
Page 639, Problems 12.1 – 12.5.

Question: 7.1 For each term, give a definition in 32 words or less.
Question: 7.4 Look up in the 9S12 data sheet how the SCI checks for noise. In particular, when is the noise flag set? How does software clear the noise flag?

Question: 7.9 Consider a serial port operating with a baud rate of 1000 bits per second. Draw the waveform occurring at the PS3 output (voltage levels are +5 and 0) when the ASCII ‘B’ ($42) is transmitted on SCI1. The protocol is one start, eight data, and one stop bit. SCI1 is initially idle, and the software writes the $42 to SCI1DRL at time = 0. Show the PS3 line before and after the frame, assuming the channel is idle before and after the frame.

Question: 7.13 A slave device will be interfaced to the Master 9S12 using SPI. The timing is shown in Figure 7.62. There are three signals that will be outputs of the 9S12 and inputs to the device (Enable, Clock, and Data). The timing of the external device is shown below. What CPHA, CPOL mode should you use?

Question: 12.1 For each term, give a definition in 32 words or less.

Question: 12.2 For each transducer parameter, give a definition in 32 words or less.

Question: 12.3 For each instrument parameter, give a definition in 32 words or less.

Question: 12.4 For each transducer, give its measurand.

Question: 12.5 For each concept, give a definition in 32 words or less.

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ECET 365 Week 2 iLab Interfacing to the Smart Car Video Sensor Updated

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ECET 365 Week 2 iLab Interfacing to the Smart Car Video Sensor Updated

Objectives:

Develop a hardware interface to the TSL1401 Video Sensor in the Smart Car Kit.

Test the sensor with software and use data to control the steering servo.

(Mini Project) Use mini lab TTL pulser to simulate the sensor inputs and control PWM output on/off so as to test your motors steering system.

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ECET 365 Week 2 Quiz Updated

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ECET 365 Week 2 Quiz Updated

Question 1. Question : (TCO 4) A transducer produces a 5 V output with an internal resistance of 50 ohms. The input resistance of the amplifier is 1,000 ohms. What is the voltage at the input of the amplifier?

Question 2. Question : (TCO 4) A signal contains a highest frequency of 500 Hz. What is the minimum sampling frequency required?

Question 3. Question : (TCO 4) A signal with a range of 0–5V is sampled with a 16-bit ADC. What is the change in voltage (delta) between digitized levels?

Question 4. Question : (TCO 4) The SPI protocol uses two lines, MOSI and MISO. What do MOSI and MISO mean and how do the data flow on these lines?

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ECET 365 Week 3 Homework Problems 2.18, 2.19, 2.20, D2.23, D2.24 Updated

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ECET 365 Week 3 Homework Problems 2.18, 2.19, 2.20, D2.23, D2.24 Updated

Pages 146 – 147, Problems 2.18, 2.19, 2.20, D2.23, D2.24

2.18     In 32 words or less, describe the meaning of each of the following terms.

19. Give a quantitative measure of modularity (e.g., System A is more modular than system B) if …

2.20     In 32 words or less, describe the meaning of each of the following debugging terms.

D2.23  Write assembly or C software to implement the following Moore FSM (Figure 2.41). Include the FSM state machine, port initialization, timer initialization, and the FSM controller. The command sequence will be output, wait the specified time in ms, input, then branch to next state. The 2-bit input is on Port T (PT1 and PT0), and the 3-bit output is on Port T (PT7, PT6, PT5). Assume the E clock is 8 MHz.

D2.24  Write assembly or C software to implement the following Mealy FSM (Figure 2.42). Include the FSM state machine, port initialization, timer initialization, and the FSM controller. The command sequence will be input, output, wait 10 ms, input, then branch to next state. The 1-bit input is on Port P (PP0), and the 3-bit output is on Port P (PP3, PP2, PP1). Assume the E clock is 8 MHz.

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ECET 365 Week 3 iLab Converting Requirements to a Work Schedule Updated

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ECET 365 Week 3 iLab Converting Requirements to a Work Schedule Updated

Objectives:

A. Develop a map showing which hardware subsystems from the kit will be used to meet each requirement. Determine if additional parts are required.
B. Determine which hardware subsystems will require software support to control the subsystems or provide communications between subsystems.
C. Produce a set of tasks needed to meet the requirements. Assign tasks to team members.
D. Develop a work schedule for a presentation to the class. Include serial and parallel scheduling of tasks to meet the time requirements.

Step 1: Procedure

A. Determine the project requirements.

B. Determine alternative subsystems to meet the requirements. 

C. Determine the set of alternatives that you will use for the project.

D. Develop a Work Schedule for the project.

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ECET 365 Week 3 Quiz Updated

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ECET 365 Week 3 Quiz Updated

Question 1. Question : (TCO 1) The type of cohesion in which the components of a software Module are in a mandatory order is called _____.

Question 2. Question : (TCO 1) A _____ records values of output ports controlled by the program. 

Question 3. Question : (TCO 2) In a program with multiple threads, the execution of an Interrupt Service Routine is called a _____.

Question 4. Question : (TCO 1) What are the differences between a Moore finite-state machine (FSM) and a Mealy FSM?

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ECET 365 Week 4 Homework Problems Updated

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ECET 365 Week 4 Homework Problems Updated

Answer Pages 242, Problem 4.10; page 586, problems 11.5c, g; and page 589, problems D11.20, D11.21.

Page 242, Problem 4.10 – What purpose might there be to use the PLL and slow down the 9S12?

Page 586, Problem 11.5 c) & g) – For each pair of terms, explain the similarities and differences in 32 words or less.

Page 589, Problem D11.20 – The input, V in, is differential not single-ended. Design an analog circuit with a transfer function of Vout = 50 ⋅ V in + 2.5 powered by a single +5 V supply. You may use any of the analog chips in this chapter. For example, you may use the REF03 2.50 V reference chip. The input range is −0.05 V to +0.05 V, and the output range is 0 to +5 V. Label all chips, resistors, and capacitors as needed. – Note: “Analog” is synonymous with “continuous” (page 531).

Page 589, Problem D11.21 – The input, V in, is single-ended not differential. Design an analog circuit with a transfer function of Vout = 50 ⋅ V in − 5 using one rail-to-rail op amp powered by a single +5 V supply. You may use one REF03 2.50 V reference chip. The input range is 0.1 to 0.2 V, and the output range is 0 to +5

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