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Day 8: Intro to Data Structures | Servos and More Music

Lecture

One Dimensional Arrays

Arrays are a type of data structure that allows for working with a group of values using a single identifier. 

Lab

Servos

Servos rotate to a particular angular position and stay there until told to move to a new position. 

There are both standard and continuous rotation servos. Unmodified ones have a fixed range due to a potentiometer in line with the drive shaft that is used for reporting the present position. Servos are controlled by sending a pulse of a certain length; this length determines the position it will rotate to. However, in a continuous rotation servo, there is no potentiometer and the servo rotates continuously, and the pulse length determines the speed instead. 

Servos draw a significant amount of current, typically more than an Arduino can supply, so it is best to use a separate power supply.

Homework

Hardware


//Servo Potentiometer Control
#include <Servo.h>
const int SERVO=9; //Servo on Pin 9
const int pir=2; //pir on pin 2
Servo myServo;
int val = 0; //for storing the reading from the POT

void setup()
  {
   myServo.attach(SERVO);
   myServo.write(90);
  }

void loop()
  {
   val = digitalRead(pir); //Read pir
   if(val==HIGH)
   {
    myServo.write(0);
    delay(2000);
    myServo.write(90);
   }
   
   delay(15); //waits for the servo
  }
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