# week three template

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```					                                     ROBO EDUCATORS ELECTRONICS
Introduction to Motor Control

Note to the teacher: This organizer “Introduction to Motor Control” is designed to teach how to control motors. In this
lesson students will learn:
 What a switch is
 How to use multiple switching mechanisms
 What a simple H-bridge is
 How to solder
 What is a relay
 What is PWM
 What is a wave
 What analog is
 What digital is
 Soldering

Mathematical concepts – Analog, digital

Scientific concepts –

Terminology: SPST, NC/NO, H-bridge, relay, Pulse Width Modulation, Analog, Digital, Discrete and non discrete values

Lesson 11                Lesson 12                Lesson 13                 Lesson 14                Lesson 15
Lesson      Switches                 H-bridge                 Electromechanical        PWM                      Introduction to
 SPST                                            Relay Control                                     Analog/Digital
 Touch sensor           Introduction to                                   Wave forms
 Tilt                   soldering                Parts of a relay and                              Analog to Digital
 NC/NO                                           relay operation                                   conversion -
converting voltage to
a value
Lectures    Intro to switching       Introduction to motor    Introduction to          What is a PWM            Define analog
mechanisms               control                  electromechanical                                 Define digital
relay control            How do we use it?        Samples of A * D
Resistive motor                                                            A/D conversion
control                  Remote switching

Review basic circuits    Small current
controlling a large
Review polarity          current

Discuss the soldering:   Review solenoid
Alloys, temperatures,
oxides, properties of    Demo two types of
metals, flux             relays
 SPDT – NO/NC
switch
 DPDT – reverses
polarity
Management/Teacher    Switches for             4 - Lever switches       Relay - switch           PWM source          Sweep second clock
Stuff                 demonstration            2 LED/Motor              Power sources            Servo               Digital clock
Wire tie                 Wire                     Scope
Basic circuit to apply   Wire connectors          Large load                                   Switch
the switches                                      Sample circuit           PWM website
Soldering techniques                                                  Light dimmer
NASA Digital verses                               Relay website
!!!

Handouts/Activities   Draw the schematic of Sketch the schematic        Have the students                            Build simple series
the circuit           of the H-bridge             identify the following                       circuit battery,
parts from a teacher                         resistor, LED using
Design an application    Build a sample H-        handout:                                     switch for digital.
that uses a limit        bridge circuit using     Parts of a relay                             Replace switch with
switch                   soldering                 Solenoid                                   pot to show analog.
 Core
Design, construct, and   Troubleshoot the H-       Armature                                   Student sheet NASA
troubleshoot a robot     bridge circuit            Leafs                                      developed worksheet
that incorporates a                                Contacts                                   on Bits, Bytes, Analog
touch sensors                                                                                  and digital graphics

Lab Demo              Teacher designed         Teacher built            Show examples and        Use scope, PWM      Demonstrate
applications             application              demonstrate a relay      source, and servo   examples of both
digital and analog
devices.
Assignments/Homework Complete all              Research transistors   Identify where relays                          Identify and list at
unfinished work,                                 are used in robotic                            least ten analog and
Research why its not a circuits                                       digital appliances.
good idea to use a
potentiometer as a
speed control for a
motor

Assessment/Notebook       Take notes              Take notes               Take notes             Take notes             Sketch schematic of
Materials                 Sketch schematics       Sketch schematics        Sketch schematics      Sketch schematics      circuit
Complete handouts       Complete handouts        Complete handouts      Complete handouts      Prepare a presentation
of lessons learned
Complete all teacher    Complete all teacher     Complete all teacher   Complete all teacher
assigned labs           assigned labs            assigned labs          assigned labs
Extension Activity        Design a robot that     Research what has        Transistors/MOSFETS    Parallel/Combination   Demonstrate A/D
uses NC/NO switches     replaced h-bridges in                                                  conversion.
as its control          modern electronic        Make a relay                                  Demonstrate binary
mechanism               applications                                                           counting
Use IR to turn relay
on.
Math/Science/Other
National Standards

1) Soldering --- soldering techniques with printed circuit boards – w/ animation
http://www.technologystudent.com/pcb/pcbdex.htm

Technology Standards #16 Students will develop an understanding of and be able to select and use energy and power technologies and #9
Students will develop an understanding of engineering design.

1) Binary Code: (NSTA 6a, 6b – ITEA 3d -- NCTM 20d)
http://media.nasaexplores.com/lessons/01-088/9-12_1.pdf
Objective: To use binary numbers to decode data, and to practice adding binary numbers.

5a) Teacher sheets: 50 minutes
http://nasaexplores.com/show_912_teacher_st.php?id=02121062236

5b) Student sheets: Binary #’s – 1’s and 0’s
http://nasaexplores.com/show_912_student_st.php?id=02121062236

6) Digital versus Analog: (NSTA 6a, 6b – ITEA 3a, 3d)
http://media.nasaexplores.com/lessons/01-088/9-12_2.pdf
Objective: To compare analog and digital technology, and to code and decode a digital image.

6a) Teacher sheets: 50 minutes
http://nasaexplores.com/show_912_teacher_st.php?id=021211145901

6b) Student sheets: bits, bytes, analog & digital graphics
http://nasaexplores.com/show_912_student_st.php?id=021211145901

2) Electronics Index -- excellent site with all of the electronics basics. Links to pages with graphics and animations include: Components,
Batteries and LED’s, Switches, Diodes, Capacitors, Resistors, Transistors and much more.
http://www.technologystudent.com/elec1/elecex.htm

Technology Standard #16 Students will develop an understanding of and be able to select and use energy and power technologies.

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