CMSC838. Tangible Interactive Assistant Professor Computer Science. Week 11 Lecture 20 April 9, 2015 Motors
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1 CMSC838 Tangible Interactive Computing Week 11 Lecture 20 April 9, 2015 Motors Human Computer Interaction Assistant Professor Computer Science
2 TODAY S LEARNING GOALS 1. Learn about the three most common motor types: DC hobby motors, servo motors, and stepper motors 2. Learn how to interface with said motors using Arduino 3. Learn about common motor drivers like H-Bridges and the Arduino motor shields
3 One More Inspiration for MP4
4 ATMOSPHERE Created by CMSC838f Spring2014 Students Ruofei Du, Kent Wills, and Max Potasznik [source:
5 MOTOR OVERVIEW
6 MEET THE MOTORS Created by Jeff Feddersen of NYU ITP [source:
7 Pulse Width Modulation (PWM): A Quick Refresher
8 WHAT IS PULSE WIDTH MODULATION? Afrotechmods [source:
9 ARDUINO: ANALOG OUT The Arduino UNO has 14 digital pins that can be used either as input or output (using the pinmode, digitalwrite, and digitalread functions). The pins operate at 5 volts. Each pin can provide or receive a maximum of 40mA and has an internal pull-up resistor, which is disconnected by default, of 20-50kOhms. 14 digital I/O pins: these pins can be used for either input or output (set the mode using the pinmode function). Some pins have special functions. For example, pins with the ~ symbol can be used to simulate analog output using pulse-width modulation (PWM). Other special functions are marked on this slide. Six of the Digital I/O pins can be configured for analog out (pins 3, 5, 6, 9, 10, & 11 on the Uno): Any pin with a ~ prefix can simulate analog output using 8-bit PWM with the analogwrite() function [sources:
10 ARDUINO ANALOGWRITE USES PULSE WIDTH MODULATION (PWM) The Arduino simulates analog output using PWM, which is very useful for controlling motors! Assume we are controlling analog pin 3. analogwrite(3, 13) 5% duty cycle Mean output: ~0.25V analogwrite(3, 128) 50% duty cycle Mean output: ~2.5V analogwrite(3, 225) 90% duty cycle Mean output: ~4.5V Approximately approximately every 1/490 of a second (490Hz), the Arduino generates a PWM pulse. The length of this pulse is controlled by the analogwrite function. So, analogwrite(0) will not produce a pulse, analogwrite(128) creates a pulse that lasts half of the cycle, and analogwrite(255) creates a pulse that lasts all the way until the next pulse (i.e., the output is on all the time) [sources:
11 In-Class Exercises
12 IN-CLASS EXERCISES Today, we are going to walk through multiple motor exercises in class to familiarize ourselves with different types of motors and motor driver circuitry (e.g., H-Bridges and motor shields). Servo Motors Servo motors use PWM for precise control of angular position, velocity, and acceleration. Servo s also contain additional sensor circuity to sense position. DC Motors and H-Bridges Learn about the simplest type of motor the DC hobby motor and how to use an H- Bridge to control the motor s direction. Stepper Motors Stepper motors divide a motor s full rotation into steps the motors position can be precisely controlled with these steps (assuming the maximum load is not exceeded). Unlike servor motors, typical steppers do not have built-in position feedback circuitry. [sources:
13 Motor Drivers
14 ADAFRUIT EXERCISES USE A L293D H-BRIDGE, WHICH IS EQUIVALENT TO THE SN [source:
15 SPARKFUN EASYDRIVER: STEPPER MOTOR DRIVER
16 ARDUINO MOTOR SHIELDS Because many motors have high current requirements (higher than individual ports can support on the arduino) and can cause problems with voltage spikes when a motor turns on and off, motor shields have become popular, easy-to-use boards for working with motors. Adafruit Motor Shield v2: $19.95 Drives up to 4 DC motors or 2 stepper motors using transistor-based drivers with 1.2A per channel and 3A peak current and a fully dedicated PWM driver chip Sparkfun Ardumoto Motor Shield: $24.95 Uses a L298 H-Bridge IC to control two DC motors up to 2A per channel
17 ADAFRUIT MOTOR SHIELD V2 TUTORIAL [source:
18 Slip Rings
19 FLASHGEAR Created by CMSC838f Students Jonggi Hong and Karthik Badam [source:
20 At first glance, it may seem like the same long wires go from the Arduino to the LEDs
21 It s actually two sets of wires connected through a special device called a slip ring These wires rotate freely
22 HOW DO SLIP RINGS WORK? Output [source:
23 SLIP RING WITH FLANGE Sold by Adafruit: [source:
24 ADAFRUIT SLIP RING EXAMPLES You can purchase slip rings in all sorts of varieties/configurations a few different examples are listed below. 6-Wire Slip Ring: $ mm diameter, 6 wires, max 2A 12-Wire Slip Ring: $ mm diameter, 12 wires, max 2A 12-Wire Miniature Slip Ring: $ mm diameter, 12 wires, max 2A [source: adafruit.com]
25
26 A BIT MORE ON SLIP RINGS The ITP Vimeo Channel has a quick 3 minute video on slip rings including using a barrel audio jacks or barrel power connectors for simple slip rings that only need a few connections [source:
27 More Great Resources
28 NYU ITP PHYSICAL COMPUTING VIDEO SERIES The NYU ITP Video series is now up to 74 videos (all short, ~5 min high-quality videos). The following are related to motors, which I encourage you to watch. The images/thumbnails are clickable. [source:
29 NYU ITP VIDEO SERIES: BASIC CIRCUITS TO DRIVE MOTORS These videos cover basic ICs, like transistors and H-Bridges, that are commonly used to drive motors. The thumbnails are clickable. Intro to Using Transistors for Motors (3:53) Using a transistor and an external power supply to control a high load motor High Current Loads (5:12) How to use relays and transistors to control high loads like motors H-Bridges (4:27) An H-Bridge is an IC that enables you to reverse your supply voltage (and thus dynamically control a motor s direction).
30 NYU ITP VIDEO SERIES: SERVO MOTORS A servo motor allows for precise control of angular position, velocity, and acceleration. A servo consists of a motor coupled to a sensor for position feedback. Servo Motor (10:54) Basic introduction to servo motors
31 NYU ITP VIDEO SERIES: STEPPER MOTORS A stepper motor is a brushless DC electric motor that divides a rotation into equal steps. The motor s position can be commanded to move and hold at any of these steps without a feedback sensor. The thumbnails below are clickable. Stepper Motors: Types (3:01) Covers different types of stepper motors (5-wire stepper, 8-wire stepper, etc.) Stepper Motors: Unipolar Steppers (5:34) Covers different types of stepper motors (5-wire stepper, 8-wire stepper, etc.) Stepper Motors: Bipolar w/h-bridge (3:14) Using an H-Bridge with Bipolar (4-wire) stepper motors. Stepper Motors: Dedicated IC Drivers (6:54) To get the most out of a stepper motor, you will want to use a dedicated stepper motor IC. [source:
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