Lab #4: Non-volatile memory, Servo Motors and MATLAB




Build a data-logger with a photoresister



Below is our code for the data logger with a photoresistor:

#include <EEPROM.h>
int pin = A0;
int index = 0; 
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(pin,INPUT);

Serial.println("Input 'W' to write data into EEPROM. Input 'R' to read data.");
}
void loop() {
  // put your main code here, to run repeatedly:
char inputChar = Serial.read();
if (inputChar == 'W'){
  for(index; index <13; index ++){
    int data = analogRead(pin);
    EEPROM.write(index, data);
    index ++;
    delay(5000);
   
  }
  index = 0; 
  
}else if (inputChar == 'R'){
  int i = 0;
  while (i <13){
    int value = EEPROM.read(i);

    Serial.println(value);
    i++;
  }
}
}

Servo Motor

Pulses 

int servo = 6; 
int inputChar;

void setup() {

Serial.begin(9600); 
pinMode(servo, OUTPUT); 
}

void loop() {

int cycle = 1500; 
digitalWrite(servo, HIGH);
delayMicroseconds(cycle);
digitalWrite(servo, LOW);
delayMicroseconds(20000-cycle);
}


Enter Angular Position

servo set position int servo = 6;
int inputChar; 

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(servo, OUTPUT);
Serial.println("Type letters a-c to see how the Servo motor changes");

}

void loop() {
  // put your main code here, to run repeatedly:
if(Serial.available()>0){
  inputChar = Serial.read();
if(inputChar == 'a'){
  Serial.println("0 degree angle");
  for(int i = 0; i <100; i++){
    digitalWrite(servo, HIGH);
    delayMicroseconds(500);
    digitalWrite(servo, LOW);
    delay(20);
  }
}
if(inputChar == 'b'){
  Serial.println("90 degree angle");
  for(int i = 0; i <100; i++){
    digitalWrite(servo, HIGH);
    delayMicroseconds(1500);
    digitalWrite(servo, LOW);
    delay(20);
  }
}
if(inputChar == 'c'){
  Serial.println("180 degree angle");
  for(int i = 0; i <100; i++){
    digitalWrite(servo, HIGH);
    delayMicroseconds(2500);
    digitalWrite(servo, LOW);
    delay(20);
  }
}
}
}




Rotating Between 2 Positions

int servo = 6;
int inputChar; 

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(servo, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(servo, HIGH);
    delayMicroseconds(500);
    digitalWrite(servo, LOW);
    delay(500);
digitalWrite(servo, HIGH);
    delayMicroseconds(1000);
    digitalWrite(servo, LOW);
    delay(500);
   
}


Control Servo Speed
int servo=6;
int inputChar;


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(servo, OUTPUT);
Serial.println("Type a-c to see variations in speed!");
}

void loop() {
  // put your main code here, to run repeatedly:

if(Serial.available() > 0){
  inputChar = Serial.read();

  while (inputChar == 'a') {
    Serial.println("Fast speed");

    digitalWrite(servo, HIGH);
    delayMicroseconds(500);
    digitalWrite(servo, LOW);
    delay(200);

    digitalWrite(servo, HIGH);
    delayMicroseconds(2000);
    digitalWrite(servo, LOW);
    delay(200);

    if(Serial.available() > 0){
      inputChar = Serial.read();
    }
  }

  while (inputChar == 'b') {
    Serial.println("Medium speed");

    digitalWrite(servo, HIGH);
    delayMicroseconds(500);
    digitalWrite(servo, LOW);
    delay(800);

    digitalWrite(servo, HIGH);
    delayMicroseconds(2000);
    digitalWrite(servo, LOW);
    delay(800);

    if(Serial.available() > 0){
      inputChar = Serial.read();
    }
  }

  while (inputChar == 'c') {
    Serial.println("Slow speed");

    digitalWrite(servo, HIGH);
    delayMicroseconds(800);
    digitalWrite(servo, LOW);
    delay(1500);

    digitalWrite(servo, HIGH);
    delayMicroseconds(2000);
    digitalWrite(servo, LOW);
    delay (15a00);

    if(Serial.available() > 0) {
      inputChar = Serial.read();
    }
  }
}

}
Control Servo with a Potentiometer
int potval = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(6, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
potval = analogRead(A2); // A2 is the pin that is connected to our potentiometer,
// so we made a variable to store and display the value
Serial.println(potval);
if (potval<= 300){ // after printing the potentiometer values to the serial monitor
  // we decided a good value to be determining factor in our if loop was 300
  digitalWrite(6, HIGH); // if the potentiometer value is less than 300, it will turn slower
  delayMicroseconds(1000);
  digitalWrite(6, LOW);
  delayMicroseconds(7000);
  delay(800);
  digitalWrite(6,HIGH);
  delayMicroseconds(2000);
  digitalWrite(6,LOW);
  delayMicroseconds(7000);
  delay(1600);
}
  else{ //if the value is higher than 300, the speed of the potentiometer is fater
  digitalWrite(6, HIGH);
  delayMicroseconds(2000);
  digitalWrite(6, LOW);
  delayMicroseconds(7000);
  delay(800);
  digitalWrite(6,HIGH);
  delayMicroseconds(1000);
  digitalWrite(6,LOW);
  delayMicroseconds(7000);
  delay(150);
  }
}



Control Speed and Angle from Serial Monitor
float angle_value = 0; //angle entered in degrees
int inputChar;
float motor_pos = 0; //value of motor position
int speed_value = 0; //speed value 
void setup() {
  // put your setup code here, to run once:
pinMode(6,OUTPUT);
Serial.begin(9600);
Serial.println("Enter angle in degrees to rotate motor");
delay(1000);
}

void loop() {
  // put your main code here, to run repeatedly:
if (Serial.available()>0){
  angle_value = 0;
  angle_value = Serial.parseInt();
  motor_pos = (500*angle_value/90)+1000;
  Serial.println(angle_value); 
  Serial.println("Motor Position");
  Serial.println(motor_pos); 
  Serial.println("Enter '1' or '10' for Speed Value"); //1 is slow, 10 is fast
  while(Serial.available() ==0){}
  speed_value = Serial.parseInt();
  Serial.println("Speed Value");
  Serial.println(speed_value);
  Serial.println("Re-enter angle to change speed");

}
  if (speed_value == 10 ){
  digitalWrite(6, HIGH);
  delayMicroseconds(motor_pos);
  digitalWrite(6, LOW);
  delayMicroseconds(20000-motor_pos);
  delay(1000);
  digitalWrite(6,HIGH);
  delayMicroseconds(1000);
  digitalWrite(6,LOW);
  delayMicroseconds(19000);
  delay(1000);
}
  else{
  digitalWrite(6, HIGH);
  delayMicroseconds(motor_pos);
  digitalWrite(6, LOW);
  delayMicroseconds(20000-motor_pos);
  delay(2000);
  digitalWrite(6,HIGH);
  delayMicroseconds(1000);
  digitalWrite(6,LOW);
  delayMicroseconds(19000);
  delay(2000);
  }
  

}

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