steam clown™ productions filepage 4 © copyright 2018 steam clown™ steam clown™ &...
TRANSCRIPT
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Page 1 © Copyright 2018 STEAM Clown™
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STEAM Clown™ Productions
Dual H-Bridge Motor Controller – L298N
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•This presentation is a tutorial and setup guide for using the L298N Dual H Bridge Motor Controller
•1. Student will be able to connect and use the L298N Controller
•2. For additional information and reference material student can refer to STEAM Clowns Closet
•3. A measure of success will be a spinning DC motor
Objective, Overview & Introduction
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STEAM Clown™ Productions
See Appendix A, for Licensing & Attribution informationby-nc-sa-3.0
https://creativecommons.org/licenses/by-nc-sa/3.0/
https://creativecommons.org/faq/#what-does-some-rights-reserved-mean
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STEAM Clown™ Productions
Can I get a copy of these Slides? Yes, Probably…
Most presentation lecture slides can be found indexed on www.steamclown.org and maybe blogged about here on Jim The STEAM Clown’s Blog, where you can search for the presentation title. While you are there, sign up for email updates
If you are on of my SVCTE Mechatronics Engineering Students, Look here on the SVCTE Mechatronics Engineering Blog: https://svctemechatronics.blogspot.com/
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•L298N Dual H Bridge Motor Controller
•Battery (7.9 – 12 volts)
•Arduino or Raspberry Pi
Resources & Materials Needed
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Control Stuff Like This…
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•H Bridge
•Motor Controller
•Differential Drive
New Words or Concepts…
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L298N Dual H-Bridge Motor Controller
• H-Bridge on STEAM Clowns Closet
• YouTube - HOW TO: control DC Motors with Arduino + L298N
• Instructables - Arduino Modules - L298N Dual H-Bridge Motor Controller
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Connecting Motors
Motor AMotor A (-)Motor A (+)
Motor BMotor B (+)Motor B (-)
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Powering the Motors
5 volts outThis can be used to power Arduino
“12” volts is just the motor power
GND
In most cases, the “12” volts will be a 9.6 v battery pack
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Controlling the Motors – Full Speed
IN1A
Don’t move Jumper
ENAEnable A
ENBEnable BIN2A IN4B
IN3B
Pin Forward Backward STOP BAD
ENA Jumper Jumper Jumper) Jumper
IN1(A) HIGH LOW LOW HIGH
IN2(A) LOW HIGH LOW HIGH
IN3(B) HIGH LOW LOW HIGH
IN4(B) LOW HIGH LOW HIGH
ENB Jumper Jumper Jumper Jumper
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H-BridgeThe Basics
Source - http://www.modularcircuits.com/blog/articles/h-bridge-secrets/h-bridges-the-basics/
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H-Bridge Circuit
• if Q1 and Q4 are turned on• The left lead of the motor will
be connected to the power supply• The right lead is connected to
ground. • Current starts flowing through
the motor which energizes the motor in (let’s say) the Clockwise direction and the motor shaft starts spinning
Source - http://www.modularcircuits.com/blog/articles/h-bridge-secrets/h-bridges-the-basics/
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H-Bridge Circuit
• if Q3 and Q2 are turned on• The left lead of the motor will
be connected to the power supply• The right lead is connected to
ground. • Current starts flowing through
the motor which energizes the motor in (let’s say) the CounterClockwise direction and the motor shaft starts spinning
Source - http://www.modularcircuits.com/blog/articles/h-bridge-secrets/h-bridges-the-basics/
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H-Bridge Circuit
QP
IN1(A)
IN2(A)
EN(A)
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H-Bridge Circuit
QP
IN1(A)
IN2(A)
EN(A)
EN(A) = HIGHIN1(A) = HIGHIN2(A) = LOW
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H-Bridge Circuit
QP
IN1(A)
IN2(A)
EN(A)
EN(A) = HIGHIN1(A) = LOWIN2(A) = HIGH
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Controlling the Motors – PWM SPEED
IN1A
Don’t move Jumper
ENAEnable A
ENBEnable BIN2A IN4B
IN3B
Pin Forward Backward STOP BAD
ENA Jumper Jumper Jumper) Jumper
IN1(A) PWM LOW LOW HIGH
IN2(A) LOW PWM LOW HIGH
IN3(B) PWM LOW LOW HIGH
IN4(B) LOW PWM LOW HIGH
ENB Jumper Jumper Jumper Jumper
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PWM
• While the signal can only be high (usually 5V) or low (ground) at any time, we can change the proportion of time the signal is high compared to when it is low over a consistent time interval
• https://learn.sparkfun.com/tutorials/pulse-width-modulation
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Controlling the Motors – PWM SPEED
IN1A
Don’t move Jumper
ENAEnable A
ENBEnable BIN2A IN4B
IN3B
Pin Forward Backward STOP BAD
ENA PWM PWM PWM=0 PWM
IN1(A) HIGH LOW LOW HIGH
IN2(A) LOW HIGH LOW HIGH
IN3(B) HIGH LOW LOW HIGH
IN4(B) LOW HIGH LOW HIGH
ENB PWM PWM Jumper Jumper
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Power Harness
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Lab Time – Spin a Motor
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•Create a Motor Harness
•Use a 9-12 volt power supply • Where the 9 volt connects to the power harness • And the harness 5 volts connects to the Arduino
•See Instructions a few slides down…
Connecting Power9-12 volts IN
5 volts OUTTo Arduino
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•Please don’t connect the computer USB power and the Power harness 5 volts at the same time
Don’t connect USB and 5v at the same time
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•Open a new Arduino sketch and copy the dcMotorTest_01 from Github• Save it on your local drive as dcMotorTest_01
•You can also copy and save dcMotorTest_02
•Compile and upload• Open a Console window to see it printing it’s status• Why is the motor not spinning? The code says it is…
•Disconnect the USB port and connect the Power Harness
Lab Time – Go Get some Code to test with
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Motor Control Pins
// General Pins and Variablesint boardLED=13;
// Motor Control Pins and Variablesbyte motorSpeed=0; // change this (0-255) to control the speed
// Left Motor const int leftDirControl1 = 2;const int leftDirControl2 = 3;const int leftSpeedControlPin = 4;
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Controlling the Motors – PWM SPEED
IN1A
Don’t move Jumper
ENAEnable A
ENBEnable BIN2A IN4B
IN3B
Pin Forward Backward STOP BAD
ENA PWM PWM PWM=0 PWM
IN1(A) HIGH LOW LOW HIGH
IN2(A) LOW HIGH LOW HIGH
IN3(B) HIGH LOW LOW HIGH
IN4(B) LOW HIGH LOW HIGH
ENB PWM PWM Jumper Jumper
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Motor Control Setupvoid setup() {// initialize serial communication @ 9600 baud:Serial.begin(9600);
//Define L298N Dual H-Bridge Motor Controller PinspinMode(leftDirControl1,OUTPUT);pinMode(leftDirControl2,OUTPUT);pinMode(leftSpeedControlPin,OUTPUT);
// Stop All MotorsmotorSpeed = 0;analogWrite(leftSpeedControlPin, motorSpeed); //Sets speed via PWMdigitalWrite(leftDirControl1, LOW);digitalWrite(leftDirControl2, LOW);delay(1000);
}
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Motor Control Loopvoid loop() {
// turn on left motor in a Clockwise motionmotorSpeed = 140; //Sets speed variable via PWM = 140;analogWrite(leftSpeedControlPin, motorSpeed); //Sets speed via PWMdigitalWrite(leftDirControl1, LOW);digitalWrite(leftDirControl2, HIGH);Serial.print("Clockwise with a speed of ");Serial.println(motorSpeed);delay(2000);
// Stop All MotorsmotorSpeed = 0;analogWrite(leftSpeedControlPin, motorSpeed); //Sets speed via PWMdigitalWrite(leftDirControl1, LOW);digitalWrite(leftDirControl2, LOW);Serial.println("All Motors STOPPED"); delay(1000);
}
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• If your motor is spinning Clockwise when you tell it to spin clockwise, great…
• If not, what can you do?• Best option is to switch the motor wires• What else could you do?
Is Your Motor Spinning? The Right way?
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•What is the difference between dcMotorTest_01 and dcMotorTest_02 ?
•What is the “stall” speed of your motor? • Stall speed is the slowest you can set the speed and still
have your motor turn• dcMotorTest has the speed set at 140. what is the
slowest speed that your motor will run? Hint: 100 isprobably to slow
Lab
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Power Harness
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Power Harness
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Power Harness
Solder
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Power Harness
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Power Harness When fixed to Equipment
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Power Harness with power Switch
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STEAM Clown™ Productions
Reference Slides
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Appendix
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Appendix A: License & Attribution
• This interpretation is primarily the Intellectual Property of Jim Burnham, Top STEAM Clown, at STEAMClown.org
• This presentation and content is distributed under the Creative Commons License CC-by-nc-sa-3.0
• My best attempt to properly attribute, or reference any other images, sources or work I have used are listed in Appendix B
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•http://www.modularcircuits.com/blog/articles/h-bridge-secrets/h-bridges-the-basics/•For additional information and reference material student can refer to STEAM Clowns Closet• https://sites.google.com/view/steam-clowns-
closet/motor-controller-l298n-dual-h-bridge-motor-controller
•https://learn.sparkfun.com/tutorials/pulse-width-modulation
Appendix B: Attribution for Sources Used
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