Arduino programming part 2
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At the end of the topic you should be able to: 1. Interface a sensor/s, device/s with Arduino for data acquisition and display the data. 2. Interface Actuators with Arduino to Control motion to build an application. 3. Build a mechatronic system using Arduino, sensors, actuators and modules.
![#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
89/28/2020](https://image.slidesharecdn.com/arduinoprogrammingpart2-201003071925/85/Arduino-programming-part-2-8-320.jpg)
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Arduino programming part 2
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- 2. What is the principle behind variable output voltage? PWM Concept 29/28/2020
- 3. What is PWM(Pulse width Modulation)? 39/28/2020
- 5. Fan example You can run the fan at different speeds How do you make the choice of speed? Table fan button 59/28/2020
- 8. #include <Keypad.h> const byte ROWS = 4; const byte COLS = 4; char hexaKeys[ROWS][COLS] = { {'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; byte rowPins[ROWS] = {9, 8, 7, 6}; byte colPins[COLS] = {5, 4, 3, 2}; 89/28/2020
- 9. Contd.. Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); void setup(){ Serial.begin(9600); } void loop(){ char customKey = customKeypad.getKey(); if (customKey){ Serial.println(customKey); } } 99/28/2020
- 10. SENSORS What is a sensor? “A sensor is an object whose purpose is to detect events or changes in its environment, and then provide a corresponding output”. Why do we need sensor? • A sensor is the guy who provides data to the a system via its input. • We need sensor to feed data to the system and tells the controller when to take action 109/28/2020
- 11. Most used sensors for Arduino 1. Temperature + Humidity Sensor This is a temperature/humidity sensor. It monitors the ambient temperature or humidity. 119/28/2020
- 12. 2. IR Sensor: • This is a multipurpose infrared sensor which can be used for color detection.The sensor provides a digital as well as analog output. An on board LED is used to indicate the presence of an object. This digital output can be directly connected to an Arduino, Raspberry Pi or any other microcontroller to read the sensor output. 129/28/2020
- 14. //IR sensor with digital input at pin no. 2 const int IR_Sensor=2; void setup() { // initialize the digital pin as an output. // Pin 13 has an LED on Arduino boards: pinMode(13, OUTPUT); //Pin 2 is connected to the output of IR_Sensor pinMode(IR_Sensor,INPUT); } void loop() { if(digitalRead(IR_Sensor)==HIGH) //Check the sensor output { 149/28/2020
- 15. digitalWrite(13, HIGH); // set the LED on } else { digitalWrite(13, LOW); // set the LED off } delay(1000); // wait for a second } Contd.. 159/28/2020
- 16. Do you remember which actuator was used in this Access gate? Stepper Motor 169/28/2020
- 18. • Stepper motors are called as Digital motor – It takes digital input to move by a step. • Stepper motor is specified by step angle of say 200 steps per revolution – 1.8 degree per step 189/28/2020
- 19. • To move a step we need to provide a digital input sequence to windings. • The sequence for bipolar/unipolar is 1000 // 1st step 0100 // 2nd step 0010 // 3rd step 0001 // 4th step 1000 // repeat of sequence for 5th step 199/28/2020
- 20. Activity 2.1 Type : Team of 2 Duration : 30 Minutes Write a program to run stepper motor in clockwise direction 209/28/2020
- 21. Stepper Motor Speed Control 219/28/2020
- 22. /* Stepper Motor Control - one revolution This program drives a unipolar or bipolar stepper motor. The motor is attached to digital pins 8 - 11 of the Arduino. The motor should revolve one revolution in one direction, then one revolution in the other direction. */ #include <Stepper.h> const int stepsPerRevolution = 200; // change this to fit the number of steps per revolution // for your motor // initialize the stepper library on pins 8 through 11: Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11); 229/28/2020
- 23. Contd.. void setup() { // set the speed at 60 rpm: myStepper.setSpeed(60); // initialize the serial port: Serial.begin(9600); } void loop() { // step one revolution in one direction: Serial.println("clockwise"); myStepper.step(stepsPerRevolution); delay(500);//Without delay stepper motor will rotate continuosly } 239/28/2020
- 24. Topic Learning Outcomes At the end of the topic you should be able to: 1. Interface a sensor/s, device/s with Arduino for data acquisition and display the data. 2. Interface Actuators with Arduino to Control motion to build an application. 3. Build a mechatronic system using Arduino, sensors, actuators and modules. 249/28/2020