1/10/2014

(Arduino Study) LED control using potentiometer





...
int potPin = 0;
int ledPin = 13;

int val=0;

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop(){
  val = analogRead(potPin);
  Serial.print(val);
  Serial.print("\n");
  digitalWrite(ledPin, HIGH);
  delay(val);
  digitalWrite(ledPin, LOW);
  delay(val);
}
--- LED brightness control using potentiometer ...
int potPin = 0;
int ledPin = 12;

int val=0;

void setup(){
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop(){
  val = analogRead(potPin);
  Serial.print(val);
  Serial.print("\n");
  analogWrite(ledPin, val/4);
}
---

1/08/2014

(Arduino Study) Led on/off duration changed by value of brightness is checked by potentiometer

the simple source code

---
int sensorPin = A0;
int ledPin = 13;
int ledBrightnessPin = 12;
int sensorValue = 0;

void setup(){
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}


void loop(){
  sensorValue = analogRead(sensorPin);
  
  Serial.print(sensorValue);
  Serial.print("\n");
  digitalWrite(ledPin, HIGH);
  delay(sensorValue);
  digitalWrite(ledPin, LOW);
  delay(sensorValue);
}
...




1/07/2014

(OpenCV, RotatedRect) How to make RotatedRect class


This is example class creation.

RotatedRect tRect(Point2f(p2.x, p2.y), Size2f(W,H), atan(mn.first)*180/3.1415);

In Here,
p2.x, p2.y is center coordinate.
in Size2f(W,H), W, H is withd and Height of rectangle.
at last, atan(mn.first)*180/3.1415 means degree, atan(mn.first) is some radian
*180/3.1415 means calculation radian to degree.

Simplify,

RotatedRect tRect(Point2f(centerX, cneterY), Size2f(W,H), rotation_degree);


Thank you.

(OpenCV, Mat class) Image buffer(point) copy to Mat

when you want to copy "unsigned char * pData" image buffer to Mat class in OpenCV.

This source is simple example code.

Mat InImg(height, width, CV_8UC1);
memcpy(InImg.data, pData, sizeof(unsigned char)*width*height);


(Arduino study) LED brightness change by pwm ( analogWrite function )

A analogWrite function generate PWM pules easy.
It can use to a motor control.




very very simple source code.
---
int ledPin = 10;

void setup(){
}

void loop(){
  //increase brightness step by +5
  for(int fadeValue = 0; fadeValue < 256; fadeValue +=5)
  {
    analogWrite(ledPin, fadeValue);
    delay(30); //wait 0.01sec
  }
  
  //decrease brightness step by -5
  for(int fadeValue=255; fadeValue >=0; fadeValue-=5)
  {
    analogWrite(ledPin, fadeValue);
    delay(30); //wait 0.01sec
  }
}
...

(iOS app Study) where File's Owner icon to set to connect outlet to actions


The answer is click View Controller then you can see property window on the right side.


1/05/2014

(Arduino study) 피에조 스피커로 소리내기 ( piezo speaker make a sound )

simple sound source code

generate 1000hz, 1000 duration sound


---
int speakerPin = 10;

void setup(){
  
}

void loop(){
 
 tone(speakerPin, 1000, 1000); //5000hz, duration 1sec
 delay(2000); //rest 2sec
}
---


---
#include "pitches.h"

int speakerPin = 8;
int melody[]={
  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, 
  NOTE_B3, NOTE_C4};
  
int noteDurations[] = {4, 8, 8, 4, 4, 4, 4, 4};
  
void soundGo(){
  for(int thisNote = 0; thisNote < 8; thisNote++){
    //melody repeat
    int noteDuration = 1000/noteDurations[ thisNote ] ;
    tone(speakerPin, melody[thisNote], noteDuration);
    //delay between sounds
    int pauseBetweenNotes = noteDuration * 1.30;
    delay( pauseBetweenNotes);
    noTone(8);
  }
}

void setup(){
  
}

void loop(){
  soundGo();
}

---
In the demo video, we can know principle of piezo speaker that is sounded by vibration.


pitches.h source code is here
---
/*************************************************
 * Public Constants
 *************************************************/

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

...