Recitation 3: Workout

A short video of myself doing step 4 and 5

int SENSOR_PIN = 2;
int tiltVal;
int prevTiltVal;
int count;

void setup() {
pinMode(SENSOR_PIN, INPUT); // Set sensor pin as an INPUT pin
Serial.begin(9600);
}

void loop() {
// read the state of the sensor
tiltVal = digitalRead(SENSOR_PIN);
// if the tilt sensor value changed, print the new value
if (tiltVal != prevTiltVal) {
if (tiltVal == 1) {
count = count +1 ;
Serial.println(count);

}

prevTiltVal = tiltVal;
}

if (count == 8 ) {
Serial.println("Yay, you’ve done one set of curls");
count=0;
}
delay(10);
}

Step 5: Exercise Challenge

As what is suggested on the website, I plugged in a buzzer to my circuit, so that it could beep whenever the person finishes a set of Bicep Curl.

int SENSOR_PIN = 2;
int tiltVal;
int prevTiltVal;
int count;
int buzzerPin = 8;

void setup() {
  pinMode(SENSOR_PIN, INPUT);  // Set sensor pin as an INPUT pin
  Serial.begin(9600);
  pinMode(buzzerPin,OUTPUT);
}

void loop() {
  // read the state of the sensor
  tiltVal = digitalRead(SENSOR_PIN);
  // if the tilt sensor value changed, print the new value
  if (tiltVal != prevTiltVal) {
    if (tiltVal == 1) {
      count = count +1 ;
      Serial.println(count);

    }

    prevTiltVal = tiltVal;
  }

  if (count == 8 ) {
    Serial.println("Yay, you’ve done one set of arm raise!");
    count=0;
    playMelody();
    
  }
  delay(10);
}


void playFreq(double freqHz, int durationMs) {
  //Calculate the period in microseconds
  int periodMicro = int((1 / freqHz) * 1000000);
  int halfPeriod = periodMicro / 2;

  //store start time
  long startTime = millis();

  //(millis() - startTime) is elapsed play time
  while ((millis() - startTime) < durationMs) {
    digitalWrite(buzzerPin, HIGH);
    delayMicroseconds(halfPeriod);
    digitalWrite(buzzerPin, LOW);
    delayMicroseconds(halfPeriod);
  }
}

void playMelody() {

  playFreq(262, 100);
  playFreq(294, 100);
  playFreq(349, 100);
  playFreq(294, 100);
  playFreq(440, 200);
  delay(100);
  playFreq(440, 400);
  playFreq(392, 400);
  delay(300);
  playFreq(262, 100);
  playFreq(294, 100);
  playFreq(349, 100);
  playFreq(294, 100);
  playFreq(392, 200);
  delay(100);
  playFreq(392, 400);
  playFreq(349, 400);

}

Reflection on my program

I tried to turn the sensor with my hand, and I found that the tilt sensor could only detect the movement which is over 180 degrees.  I tried simply turn the sensor in 90 degrees, and I found that nothing happened. 

And then I tried to shake the sensor, the sensor did not show any value. I guess the sensor might not be sensitive enough for a small movement. Only if I raised or put down my arms slowly, the sensor could detect the movement I made.

As small movement could not be detected by the tilt sensor, I think it is not suitable for elderly or people who are disabled. Bending their limbs over 180 degrees seems to be difficult for them.