This tutorial will walk you through getting the I2C and SPI interfaces of your Raspberry Pi working. These interfaces aren’t enabled by default, and need some extra configuration before you can use them.
Recommended Reading
Before we get started, you might want to review some related background material.
I2C is a useful bus that allows data exchange between microcontrollers and peripherals with a minimum of wiring.
This is the Arduino tutorial video to explain how you can run two DC motors and control the speed and direction using L298N Driver module with Arduino.
Download the EAGLE Schematics, Board Layout and code from here: https://drive.google.com/open?id=0B8lxGSgwuFtYfjVLZHhINUt2cW1taFBDYndudkV6R0xLXzhKR1lRNWRQTVZYOVA1ek5NVk0&authuser=0
INTRODUCTION :
The development of high performance motor drives is very important in industrial as well as other purpose applications. Generally all high performance motor drives use quadrature encoders and PID control because of its simplicity and precise control. The quadrature encoder acts as a feedback from the motor, it is connected to the microcontroller for furthur processing.
With the use of Arduino, l298N and Optical Quadrature Encoder we can drive the dc motor at desired speed having a feedback loop and in this project we have used proportional integral and derivative method in which errors are not only solved but also taken to its minimal value with very low amount of error oscillations.
PROPORTIONAL CONTROL:
The proportional part of PID examines the magnitude of the error and it reacts proportionally. A large error receives a large response
INTEGRAL CONTROL:
To address the first issue with the proportional control, integral control attempts to correct small error (offset).
DERIVATIVE CONTROL:
The derivative part of the control output attempts to look at the rate of change in the error signal. Derivative will cause a greater system response to a rapid rate of change than to a small rate of change.
Visit the below link to gain knowledge about PID control.
The below link shows all about rotary encoders, please go through the link to gain knowledge.
http://en.wikipedia.org/wiki/Rotary_encoder
Materials Used :
1 300 RPM Geared Motor.
1 L298N Motor Driver.
1 Slotted Encoder Disk (32 slots).
2 MOC7811 Optical Slotted Interrupters.
2 10 K Resistors.
1 220 Ohm Resistors.
General Purpose PCB.
1 Arduno UNO.
Connecting Wires.
The Image below shows the circuit diagram of MOC7811 Optical Encoder, We need to make 2 circuits as we are making a quadrature encoder. SignalOut pin of bothe MOC7811 should be connected to pin 2 and 3 of arduino as these are interrupt pins of the arduino.
Solder the encoders on a general purpose PCB as shown below.
You can add Schmitt Trigger IC CD40106 so as to convert the output of encoders into pure square wave. Connect MOC7811 output to Vi in the below circuit and connect bthe Vo to arduino. There was not much significant difference even after I added the schmitt trigger.
We have provided a methodical set of videos and instructional material to teach you how to use the Arduino Microcontroller. We start simple, and take you through things step by step.
Arduino Lesson 1: In this lesson we take our first look at the Arduino Microcontroller, and you will write your first simple program. Don’t be afraid, we will take you through it step by step with a video and instructional diagrams.
Arduino Lesson 2: In this lesson we build our first external circuit and control it from the Arduino. We use digitalWrite commands to turn the arduino on and off.
Arduino Lesson 3: In this lesson we create a two LED circuit, and we learn about for loops.
Arduino Lesson 4: Learn how to print to your computer screen from the Arduino using your serial port. Good Stuff!
Arduino Lesson 5: Learn how to work with strings in arduino. This is a simple but important lesson
Arduino Lesson 6: This lesson will show you how to get user input from the Serial Monitor. This will take your programming to the next level!
Arduino Lesson 7: This lesson will show you how to implement while loops.
Arduino Lesson 8: This lesson will show you how to write arbitrary voltages between 0 and 5 volts to the arduino pins.
Arduino Lesson 9: Introduction to Ohm’s Law, and using a potentiometer.
Arduino Lesson 14: If Statements and Conditionals in the Arduino. In this lesson we learn how to have the user input his color preference, and then turn the RGB led to any color requested by the user.
Arduino Lesson 15: This is a Super Cool project that turns the RGB LED to whatever color that is put in front of a color sensor. It works for an amazing array of color cards.
Arduino Lesson 16: Control the position of a servo from a potentiometer using the Arduino.
Arduino Lesson 17: Measure the Speed of Sound with an Arduino and ultrasonic sensor.
Arduino Lesson 18: Ultrasonic Sensor is used with Arduino to create a distance measuring tool. The measured distance is conveyed to the user by a servo pointing an arrow at a scale.
Arduino Lesson 19: Step-by-step tutorial on connecting and using an LCD display with the arduino.
Arduino Lesson 20: Tutorial on creating a Distance Measurement device based on the Arduino, an LCD, and an ultrasonic sensor.
Arduino Lesson 21: Logging Pressure and Sensor Data onto SD card. This shows you how to easily save your arduino data to an SD card.
Arduino Lesson 22: This lesson presents step-by-step instructions on creating a GPS tracker. This is first part of project, and will be completed in Lesson 23.
Arduino Lesson 23: This lesson presents step-by-step instructions on creating a GPS tracker with data logging capability.
Arduino Lesson 24: Understanding NMEA Sentences, and formatting GPS coordinates properly for display in Google earth.
