Arduino Basics: Fun
Showing posts with label Fun. Show all posts
Showing posts with label Fun. Show all posts

9 November 2018

Digital Rain Cloud

 
 

Description

This is a very simple project that turns a Rainbow Cube Kit from Seeedstudio, into a digital rain cloud. It features a relaxing rain animation which is ruined by a not-so-relaxing yet somewhat realistic lightning effect. The animation has a very random pattern, and is quite satisfying to watch. The strategically placed cotton wool on the top of the cube makes all the difference to the project, and is sure to impress all of your friends. Luckily, I have done all of the hard work for you. You will find the full source code for the animation sequence below. You just have to provide the Rainbow Cube Kit and the cotton wool. Have fun !!

 
 

4 August 2015

MT8870 DTMF - Dual Tone Multi Frequency Decoder

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:

Software/Apps Required

Arduino Sketch


Upload the following sketch to the Arduino.
 

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/* ================================================================================================================================================== 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.


If you like this page, please do me a favour and show your appreciation :

 
Visit my ArduinoBasics Google + page.
Follow me on Twitter by looking for ScottC @ArduinoBasics.
I can also be found on Pinterest and Instagram.
Have a look at my videos on my YouTube channel.


 
 
             

 



However, if you do not have a google profile...
Feel free to share this page with your friends in any way you see fit.

8 June 2011

Arduino UNO: LED Sensor, Part One

As seen in the previous blog postings, the LED (Light Emitting Diode) was used to DISPLAY the result of various sensors. It was also used to create a variety of Light patterns or sequences.

The LED is commonly used as an OUTPUT device, however, I have since found out: there is another option.

You can use the LED as an INPUT device !!



I have only tried this with a Yellow LED and a Red LED, however, this should work with any colour. Some sites recommend using a clear/transparent/colourless LED for best effect, but it depends on what you are trying to achieve.

The LED responds better to light of the same wavelength that it emits. So a yellow LED responds better to yellow light, and a red LED responds better to Red light.

The following experiment attempts to prove this theory.
A Red and Yellow LED alternate and fade in to maximum brightness using PWM (Analog Output). Meanwhile, a separate LED is used as an INPUT device to receive the light. The value obtained is plotted using a processing sketch.

The chart above used a Yellow LED to measure the light emitted from a Red and then a Yellow LED.
As the Yellow LED gets brighter, the INPUT LED takes less time to discharge, and thus produces a lower result. On the other hand, the Red LED has little effect on the INPUT LED, despite it's brightness.
Ambient light will produce different graph patterns.

Parts Required:
  • Arduino UNO
  • 2 x Yellow LEDs
  • 1 x Red LED
  • 3 x 330 ohm Resistors (choose resistors suitable for your LEDs)
  • 5 wires to connect the circuit
  • Breadboard
  • Processing software
Here is the Sketch:

     Created with Fritzing : http://fritzing.org/


Here is the Arduino Code: which was adapted from this site.
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#define LED_Sensor_NEG 8
#define LED_Sensor_POS 7
#define Yellow_LED 10
#define Red_LED 9

int switcher=0;
int lightLevelY=0;
int lightLevelR=0;

void setup(){
  pinMode(LED_Sensor_POS,OUTPUT);
  digitalWrite(LED_Sensor_POS,LOW);
  pinMode(Yellow_LED,OUTPUT);
  pinMode(Red_LED,OUTPUT);
    
  //Turn on Serial Protocol
  Serial.begin(9600);
}

void loop()
{      

  //Alternate the flashing of the Yellow and Red LED 
  if(switcher==0){
    lightLevelR+=4;
    if(lightLevelR>255){
      lightLevelR=0;
      switcher=1;
    }
  } else {
    lightLevelY+=3;
    if(lightLevelY>255){
      lightLevelY=0;
      switcher=0;
    }
  }
  analogWrite(Red_LED,lightLevelR);
  analogWrite(Yellow_LED,lightLevelY);


  // Charge the LED by applying voltage in the opposite direction
  pinMode(LED_Sensor_NEG,OUTPUT);
  digitalWrite(LED_Sensor_NEG,HIGH);
  
  // Set pin 8 to read the input and Turn off the internal pull up resistor. 
  // The greater the amount of light in the room, the smaller the number represented by variable "darkness".
  long darkness=0;
  int outputVal=0;
  pinMode(LED_Sensor_NEG,INPUT);
  digitalWrite(LED_Sensor_NEG,LOW);  
  while((digitalRead(LED_Sensor_NEG)!=0) && darkness<80000){
     darkness++;
  }

  outputVal=darkness/80;
  //Print the darkness level in the room.
  Serial.println(outputVal);
}

Here is the Processing Code:     Code Source
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/* Processing code for this example */
 
 // Graphing sketch
 
 
 // This program takes ASCII-encoded strings
 // from the serial port at 9600 baud and graphs them. It expects values in the
 // range 0 to 1023, followed by a newline, or newline and carriage return 
 // Created 20 Apr 2005
 // Updated 18 Jan 2008
 // by Tom Igoe
 // This example code is in the public domain.
 
 import processing.serial.*;
 
 Serial myPort;        // The serial port
 int xPos = 1;         // horizontal position of the graph
 
 void setup () {
 // set the window size:
 size(400, 300);        
 
 // List all the available serial ports
 println(Serial.list());
 // I know that the second port in the serial list on my PC 
 // is always my  Arduino, so I open Serial.list()[1].
 // Open whatever port is the one you're using.
 myPort = new Serial(this, Serial.list()[1], 9600);
 // don't generate a serialEvent() unless you get a newline character:
 myPort.bufferUntil('\n');
 // set inital background: 
background(0);
 }
 void draw () {
 // everything happens in the serialEvent()
 }
 
 void serialEvent (Serial myPort) {
 // get the ASCII string:
 String inString = myPort.readStringUntil('\n');
 
 if (inString != null) {
 // trim off any whitespace:
 inString = trim(inString);
 // convert to a float and map to the screen height:
 float inByte = float(inString); 
 inByte = map(inByte, 0, 1023, 0, height);
 
 // draw the line: 
stroke(127,34,255);
 line(xPos, height, xPos, height - inByte);
 
 // at the edge of the screen, go back to the beginning:
 if (xPos >= width) {
 xPos = 0;
 background(0); 
 } 
 else {
 // increment the horizontal position:
 xPos++;
 }
 }
 }