malikmal: control

MT8870 DTMF - Dual Tone Multi Frequency Decoder

Oleh Unknown

Project Description

We will be using an MT8870 DTMF module with an Arduino UNO to control a small servo motor in this project. The DTMF module gives the Arduino super-powers and allows you to control the Servo motor in so many ways. For example, this tutorial will show you how to control the servo motor using:

a YouTube Video
a voice recorder
A web application (Online tone generator)
A smart phone app (DTMF Pad)
A touch-tone phone to cell-phone call

All of these control methods will take advantage of the same exact Arduino code/sketch. But how???
The MT8870 DTMF decoder is quite a neat little module that allows you incorporate DTMF technology into your arduino projects. DTMF stands for Dual-Tone Multi-Frequency. DTMF tones are commonly associated with touch-tone phones and other telecommunication systems. When you press the number "1" on a touch-tone phone, two sine waves with frequencies: 697Hz and 1209Hz are combined to produce a unique DTMF signal which can be transmitted through the phone line. The MT8870 DTMF module can take this signal as an input, and decode it to produce a binary output.

The DTMF module does not care how you produce the DTMF tone. However, if it receives this tone, it will decode it. We can take advantage of this feature to supply the module with tones from different sources. The module has a 3.5mm port for line input. Providing you can connect your DTMF source to this line input in some way, it should work. I must warn you, however that this is a line input and NOT a microphone input. If you wanted to use a microphone, you will need to boost or amplify the signal before sending it to the DTMF module.

You will need the following parts for this project

Parts Required:

Arduino Uno or compatible board
ICStation MT8870 DTMF decoding module
Jumper Cable (Male to Female)
Hobby Servo Motor
A cable to connect DTMF source with MT8870 DTMF Module's 3.5mm port
A voice recorder (optional)
2 x touch-tone phones / smart phones (optional)

Software/Apps Required

Arduino Sketch

Upload the following sketch to the Arduino.

/* ==================================================================================================================================================          Project: MT8870 DTMF Servo sketch           Author: Scott C          Created: 4th August 2015      Arduino IDE: 1.6.4          Website: http://arduinobasics.blogspot.com/p/arduino-basics-projects-page.html      Description: This project will allow you to control a Servo motor using an Arduino UNO and a MT8870 DTMF Module.                   The DTMF signal is received through the 3.5mm port of the DTMF module and is decoded. We will use the                   decoded output to control the position of the Servo. A SG-5010 Servo motor was used in this project. ===================================================================================================================================================== *///This sketch uses the Servo library that comes with the Arduino IDE #include <Servo.h>  //Global variables----------------------------------------------------------------------------------------- Servo SG5010;             // The SG5010 variable provides Servo functionality int servoPosition = 0;    // The servoPosition variable will be used to set the position of the servo byte DTMFread;            // The DTMFread variable will be used to interpret the output of the DTMF module. const int STQ = 3;        // Attach DTMF Module STQ Pin to Arduino Digital Pin 3  const int Q4 = 4;        // Attach DTMF Module Q4  Pin to Arduino Digital Pin 4  const int Q3 = 5;        // Attach DTMF Module Q3  Pin to Arduino Digital Pin 5  const int Q2 = 6;        // Attach DTMF Module Q2  Pin to Arduino Digital Pin 6  const int Q1 = 7;        // Attach DTMF Module Q1  Pin to Arduino Digital Pin 7  /*========================================================================================================= setup() : will setup the Servo, and prepare the Arduino to receive the MT8700 DTMF module's output. ========================================================================================================== */void setup() {  SG5010.attach(9);             // The Servo signal cable will be attached to Arduino Digital Pin 9   SG5010.write(servoPosition);  // Set the servo position to zero.   //Setup the INPUT pins on the Arduino   pinMode(STQ, INPUT);  pinMode(Q4, INPUT);  pinMode(Q3, INPUT);  pinMode(Q2, INPUT);  pinMode(Q1, INPUT);} /*========================================================================================================= loop() : Arduino will interpret the DTMF module output and position the Servo accordingly ========================================================================================================== */void loop() {  if(digitalRead(STQ)==HIGH){       //When a DTMF tone is detected, STQ will read HIGH for the duration of the tone.     DTMFread=0;    if(digitalRead(Q1)==HIGH){      //If Q1 reads HIGH, then add 1 to the DTMFread variable       DTMFread=DTMFread+1;    }    if(digitalRead(Q2)==HIGH){      //If Q2 reads HIGH, then add 2 to the DTMFread variable       DTMFread=DTMFread+2;    }    if(digitalRead(Q3)==HIGH){      //If Q3 reads HIGH, then add 4 to the DTMFread variable       DTMFread=DTMFread+4;    }    if(digitalRead(Q4)==HIGH){      //If Q4 reads HIGH, then add 8 to the DTMFread variable       DTMFread=DTMFread+8;    }    servoPosition = DTMFread * 8.5;   //Set the servoPosition varaible to the combined total of all the Q1 to Q4 readings. Multiply by 8.5 to amplify the servo rotation.   }  SG5010.write(servoPosition);        //Set the servo's position according to the "servoPosition" variable. }

Fritzing Sketch

Connect the Arduino to the MT8870 DTMF module, and to a Servo.
Use the following Fritzing sketch as a guide.

(Click the image above to enlarge it)

Discussion

You will need to connect a cable from the DTMF module's 3.5mm port to that of your smart phone, computer, voice recorder or any other DTMF source of your choice.

When you power up your Arduino, the Servo motor should turn all the way to the left to it's zero position. Once the DTMF module receives a DTMF signal, it will identify the relevant frequecies as described in the table at the beginning of this tutorial, and produce a binary like output. You will notice the DTMF module's onboard LEDs light up when a tone is detected. Onboard LED (D5) will turn on for the length of the DTMF tone it just received, and turn off when the tone has stopped. On the other hand, the onboard LEDs (D1 to D4) will light up depending on the tone received, and will remain lit until the module receives another tone. The onboard LEDs are a visual representation of the voltages applied to the DTMF module's pins (Q1 to Q4, and STQ). Q1 matches D1, Q2 matches D2 etc etc. and STQ matches D5.

You will notice that there are two STQ pins on the DTMF module. The STQ pin that is closest to Q4 will only go high when a DTMF tone is detected, and will remain high for the duration of the tone. The other STQ pin is the exact opposite. It will switch LOW when a tone is received and remain LOW for the duration of the tone. When there is no tone, this STQ pin will remain HIGH. The table below provides a summary of the DTMF module outputs, with a blue box representing a voltage applied to that pin (HIGH), whereas a black box indicates no voltage applied (LOW).

In order to follow this project, you need a source of DTMF tones. You can produce DTMF tones using a touch-tone phone, or through the use of a DTMF Pad app. If you are feeling creative, you can create a DTMF song/tune like the one I posted on YouTube. You can see the video below:

As you can see from the video, I also recorded the DTMF tune onto a voice recorder, and was able to control the servo that way. If you are not feeling creative, you can visit this website to create DTMF tones from your browser.

Concluding comments

This project was very fun, and shows some novel ways to control your Arduino. After completing the project, I realised that I could use this module to alert me when new emails or messages arrive on my phone or computer. If you have the ability to change the email or message notification sound to a DTMF tone, you should be able to get the module and Arduino to respond accordingly. Oh well, maybe I'll save that project for another day.

If this project helped you in anyway or if you use my code within your project, please let me know in the comments below. I would be interested to see what you did.

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Description: MT8870 DTMF - Dual Tone Multi Frequency Decoder Rating: 3.5 Reviewer: Unknown ItemReviewed: MT8870 DTMF - Dual Tone Multi Frequency Decoder

Jumper: Arduino controlled animation

Oleh Unknown

In this project, I have connected an Arduino to my computer and used a photoresistor to control an animation on the screen. Other sensors could have been used, but I chose a photoresistor because it feels like magic!!

The photoresistor responds to changes in ambient light as my hand moves up and down. The Arduino sends the reading to a Processing sketch on the computer via a Serial command (through the USB cable). The processing sketch interprets the signal from the Arduino and selects the appropriate picture to display.

I took a series of screenshots from the following YouTube video: http://www.youtube.com/watch?v=h6nE8m74kDg And after borrowing a bit of code from these sites (1,2), the project was born.
This idea is not new, nor my own. There are many people who have done this project before, but I thought to blog about how I have done it, just for fun.

The Project Movie

Components Required

Arduino Uno (and associated software), and USB cable
Photoresistor or Photocell
10K resistor
Wires to put it all together
Processing IDE from http://processing.org
Computer/laptop

The Arduino Sketch

The picture above was made using Fritzing

The Arduino Code:

You can download the Arduino IDE from this site.

/* Jumper: Using an Arduino to animate:
   Written by ScottC on 02/06/2012 */

int photoRPin = 0; 
int minLight;
int maxLight;
int lightLevel;
int adjustedLightLevel;
int oldLightLevel;

void setup() {
  Serial.begin(9600);
  
  //Setup the starting light level limits
  lightLevel=analogRead(photoRPin);
  minLight=lightLevel-10;
  maxLight=lightLevel;
  oldLightLevel=lightLevel;
}

void loop(){
   lightLevel=analogRead(photoRPin);
   delay(10);
  
  //auto-adjust the minimum and maximum limits in real time   
   if(minLight>lightLevel){
     minLight=lightLevel;
   }
   if(maxLight<lightLevel){
     maxLight=lightLevel;
   }
   
   //Map the light level to produce a result between 1 and 28.
   adjustedLightLevel = map(lightLevel, (minLight+20), (maxLight-20), 1, 28); 
   adjustedLightLevel = constrain (adjustedLightLevel, 1,28);
   
   /*Only send a new value to the Serial Port if the 
     adjustedLightLevel value changes.*/
   if(oldLightLevel==adjustedLightLevel){
     //do nothing if the old value and the new value are the same.
   }else{
     //Update the oldLightLevel value for the next round
     oldLightLevel=adjustedLightLevel;
     
     /*Send the adjusted Light level result 
       to Serial port (processing)*/
     Serial.println(adjustedLightLevel);
   } 
}

The code above was formatted using this site.

The Processing Code:

You can download the Processing IDE from this site.

/* Jumper: Using an Arduino to animate
   Written by ScottC on 02/06/2012

Source code derived from : 
  http://processing.org/learning/topics/sequential.html
  http://processing.org/discourse/beta/num_1267080062.html

Pictures captured from:
  http://www.youtube.com/watch?v=h6nE8m74kDg      
  
======================================================= */

import processing.serial.*;
Serial myPort;
String sensorReading="";

// Create the array that will hold the images
PImage[] movieImage = new PImage[29];

/* The frame variable is  used to control which 
   image is displayed */
int frame = 1;



/* Setup the size of the window. Initialise serial communication with Arduino
   and pre-load the images to be displayed later on. This is done only once.
   I am using COM6 on my computer, you may need replace this value with your
   active COM port being used by the Arduino.*/

void setup(){
  size(700,600);
  
  myPort = new Serial(this, "COM6", 9600);
  myPort.bufferUntil('\n');
  
  for(int i=0;i<28;i++){
    movieImage[i] = loadImage("Jumper" + (i+1) + ".jpg");
  }
}




// The draw function controls the animation sequence.

void draw(){
  
  //this draws the relevant image to the window  
  image(movieImage[frame-1],0,0,width,height);
}

void serialEvent (Serial myPort){
 sensorReading = myPort.readStringUntil('\n');
  if(sensorReading != null){
    sensorReading=trim(sensorReading);
    if (sensorReading.length()<2){
      frame = integerFromChar(sensorReading.charAt(0));
    }else{
      frame = integerFromChar(sensorReading.charAt(0))*10;
      frame += integerFromChar(sensorReading.charAt(1));
    }
  }
}



/* This function used to convert the character received from the
   serial port (Arduino), and converts it to a number */
   
int integerFromChar(char myChar) {
  if (myChar < '0' || myChar > '9') {
    return -1;
  }else{
  return myChar - '0';
  }
}

The code above was formatted using this site.

The pictures

Captured from this YouTube Video: http://www.youtube.com/watch?v=h6nE8m74kDg

Description: Jumper: Arduino controlled animation Rating: 3.5 Reviewer: Unknown ItemReviewed: Jumper: Arduino controlled animation

Mouse Controlling Arduino LEDs

Oleh Unknown

Use a mouse to control LEDs attached to an Arduino. This project uses the processing language to transmit the mouse coordinates to the Arduino, which then uses this information to turn on some LEDs. Please see the video below to see it in action.

Components Required for this project:

Arduino UNO
Breadboard
9 LEDs
9 x 330 ohm resistors
Wires to connect the circuit
USB connection cable: to connect the computer to the Arduino
A computer: to run the processing sketch, and to compile / upload the Arduino sketch
Processing Program installed on computer
Arduino Program installed on the computer

Arduino Sketch

This was made using Fritzing.

Arduino Code

You can download the Arduino IDE from this site.

/* This program was created by ScottC on 9/5/2012 to receive serial 
signals from a computer to turn on/off  1-9 LEDs */

void setup() {                
  // initialize the digital pins as an output.
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
// Turn the Serial Protocol ON
  Serial.begin(9600);
}

void loop() {
  byte byteRead;

   /*  check if data has been sent from the computer: */
  if (Serial.available()) {
  
    /* read the most recent byte */
    byteRead = Serial.read();
    //You have to subtract '0' from the read Byte to convert from text to a number.
    byteRead=byteRead-'0';
    
    //Turn off all LEDS
    for(int i=2; i<11; i++){
      digitalWrite(i, LOW);
    }
    
    if(byteRead>0){
      //Turn on the relevant LEDs
      for(int i=1; i<(byteRead+1); i++){
        digitalWrite(i+1, HIGH);
      }
    }
  }
}

The code above was formatted using this site.

Processing Code

You can download the Processing IDE from this site.

//Created by ScottC on 12/05/2012 to send mouse coordinates to Arduino

import processing.serial.*;

// Global variables
int new_sX, old_sX;
int nX, nY;
Serial myPort;

// Setup the Processing Canvas
void setup(){
  size( 800, 400 );
  strokeWeight( 10 );
 
  //Open the serial port for communication with the Arduino
  //Make sure the COM port is correct
  myPort = new Serial(this, "COM6", 9600);
  myPort.bufferUntil('\n'); 
}

// Draw the Window on the computer screen
void draw(){
  
  // Fill canvas grey
  background( 100 );
    
  // Set the stroke colour to white
  stroke(255); 
  
  // Draw a circle at the mouse location
  ellipse( nX, nY, 10, 10 );

  //Draw Line from the top of the page to the bottom of the page
  //in line with the mouse.
  line(nX,0,nX,height);  
}


// Get the new mouse location and send it to the arduino
void mouseMoved(){
  nX = mouseX;
  nY = mouseY; 
  
  //map the mouse x coordinates to the LEDs on the Arduino.
  new_sX=(int)map(nX,0,800,0,10);

  if(new_sX==old_sX){
    //do nothing
  } else {
    //only send values to the Arduino when the new X coordinates are different.
    old_sX = new_sX;
    myPort.write(""+new_sX);
  }
}

The code above was formatted using this site.

Description: Mouse Controlling Arduino LEDs Rating: 3.5 Reviewer: Unknown ItemReviewed: Mouse Controlling Arduino LEDs