malikmal: Servo

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

Introduction:

The IRTEMP module from Freetronics is an infrared remote temperature sensor that can be incorporated into your Arduino / microcontroller projects. It can scan a temperature between -33 to +220 C, and can be operated using a 3.3 to 5V power supply. It can be powered directly from the Arduino 5V pin. This module can also provide an ambient temperature reading if required.
The Servo used in this project is a SG-5010 standard servo which will be utilised to display the temperature reading from the IRTEMP module.

Parts Required:
Freetronics Eleven or any compatible Arduino.
Freetronics IRTEMP module
MG-995 or SG-5010 Standard servo
Mini Breadboard 4.5cm x 3.5cm
Protoshieldand female header pins (not essential - but makes it more tidy)
9V Battery and Battery Clip
Wiresto connect it all together

Gauge parts:
Paper (to print the face of the gauge), and some glue to stick it to the wood.
MDF Standard panel (3mm width) - for the top and base of the gauge.
Galvanized bracket (25x25x40mm)
Timber screws: Hinge-long threads csk head Phillips drive (4G x 12mm)

The Video:

The Arduino Sketch:

The above sketch was created using Fritzing.

Arduino Code:
You can download the Arduino IDE from this site.

The IRTemp gauge requires a driver library to be installed into the Arduino IDE.
The latest IRTemp driver library can be found here.

/* -------------------------------------------------------
Analog IR Temperature Gauge: written by ScottC on 1st Dec 2012.
http://arduinobasics.blogspot.com/2012/12/arduino-basics-analog-ir-temperature.html


 * Some of the code was adapted from a sketch by Andy Gelme (@geekscape)
 * For more information on using the IRTEMP 
 see www.freetronics.com/irtemp
 
 * IRTemp library uses an Arduino interrupt:
 * If PIN_CLOCK = 2, then Arduino interrupt 0 is used
 * If PIN_CLOCK = 3, then Arduino interrupt 1 is used
 ---------------------------------------------------------*/

#include "IRTemp.h"
#include <Servo.h> 

Servo servo1;
static const byte PIN_DATA = 2;
static const byte PIN_CLOCK = 3; // Must be either pin 2 or pin 3
static const byte PIN_ACQUIRE = 4;

static const bool SCALE=false; // Celcius: false, Farenheit: true

/* Used to capture the temperature from the IRTEMP sensor */
float irTemperature;
int temp;

/* The minimum and maximum temperatures on the gauge. */
static const int minTemp = -45;
static const int maxTemp = 135;


/* The servo minimum and maximum angle rotation */
static const int minAngle = 0;
static const int maxAngle = 175;
int servoPos;

IRTemp irTemp(PIN_ACQUIRE, PIN_CLOCK, PIN_DATA);



/*----------------------SETUP----------------------*/

void setup(void) {
 
 servo1.attach(9); // turn on servo
}


/*-----------------------LOOP-----------------------*/

void loop(void) {
 irTemperature = irTemp.getIRTemperature(SCALE);
 printTemperature("IR", irTemperature);

 /* If you want the ambient temperature instead - then use the code below. */
 //float ambientTemperature = irTemp.getAmbientTemperature(SCALE);
 //printTemperature("Ambient", ambientTemperature);

}

/*-----------printTemperature function---------------*/

void printTemperature(char *type, float temperature) {
 
 temp=(int) temperature;
 servoPos = constrain(map(temp, minTemp,maxTemp,minAngle,maxAngle),minAngle,maxAngle);
 
 if (isnan(temperature)) {
 //is not a number, do nothing
 }
 else {
 
 /* To test the minimum angle insert the code below */
 //servoPos = minAngle;
 
 /*To test the maximum angle, insert the code below */
 //servoPos = maxAngle;

 /* Rotate servo to the designated position */
 servo1.write(servoPos);
 }
}

The code above was formatted using hilite.me

Notes:

Ambient temperature: If you want to get the ambient temperature from the IRTEMP module, then have a look at lines 58-59.
Servo Angles: You will notice on line 36, the maximum servo angle used was 175. This value was obtained through trial and error (see below).

Calibrating the servo angles
You may need to calibrate your servo in order to move through an angle of 0 to 180 degrees without straining the motor.Change the minAngle on line 35to a safe value (for example: 10), and the maxAngle on line 36 to a value like 170. Remove the comment tag (//) on line 76, and then run the sketch. Lower the minAngle until it reaches the minimum value on the gauge, making sure that the servo doesn't sound like it is straining to keep it in position.

Add the comment tag (//) back in, and then take out the comment tag for line 79. And follow a similar process, until you reach the maximum value on the gauge. Once again, make sure that the servo is not making a straining noise to hold it at that value. Make sure to add the comment tag back in, when you have finished the calibration.

In this example, the servo's minAngle value was 0, and maxAngle value was 175 after calibration, however, as you can see from the video, the physical range of the servo turned out to be 0 to 180 degrees.

The Temperature Gauge Picture

The following gauge was created in Microsoft Excel using an X-Y chart. Data labels were manually repositioned in order to get the desired numerical effect.

Description: Analog IR Temperature gauge Rating: 3.5 Reviewer: Unknown ItemReviewed: Analog IR Temperature gauge