Arduino Basics_ 433 MHz RF Module With Arduino Tutorial 3

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20 July 2014

433 MHz RF module with Arduino Tutorial 3

n the first tutorial, I introduced the 433 MHz Transmitter and Receiver with a simple sketch to test theirunctionality. In the second tutorial, the 433MHz receiver was used to receive a signal from an RF remote.

The RF remote signal was coded based on the pattern and length of its HIGH and LOW signals. The signalseceived by the remote can be described by the code below:

Code comparison table

The RF remote that I am using transmits the same signal 6 times in a row. The signal to turn the light on isdifferent from that used to turn the light off. In tutorial 2, we were able to "listen to" or receive the signal fromhe RF remote using the RF receiver. I thought it would be possible to just play back the signal received on

he Arduino's analogPin, but the time it takes to perform a digital write is different to the time it takes to do anAnalogRead. Therefore it won't work. You need to slow down the digitalWrite speed.

Project 3: RF Remote Control Emulation

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would like to find out if it is possible to apply this delay to all 433 MHz signal projects, however, I only haveone 433 MHz remote.

f the delay in your project is the same as mine (or different) I would be keen to know - please leave acomment at the end of the tutorial.

We are going to use trial and error to find the optimal digitalWrite delay time. We will do this by slowlyncrementing the delay until the transmission is successful. The transmission is considered successful if thean-light turns on/off. All we have to do is count the number of transmissions until it is successful, then we

should be able to calculate the delay.

Arduino UNO or compatible board

Breadboard

Wires

RF Module (433 Mhz) - Transmitter and Receiver pairor the 315 Mhz version

Mercator Ceiling Fan/Light with Remote

Parts Required

The Transmitter Fritzing Sketch

RF Calibration - Arduino Sketch

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/*

Transmit sketch - RF Calibration

Written by ScottC 17 July 2014

Arduino IDE version 1.0.5

Website: http://arduinobasics.blogspot.com

Transmitter: FS1000A/XY-FST

Description: A simple sketch used to calibrate RF transmission.

------------------------------------------------------------- */

#define rfTransmitPin 4 //RF Transmitter pin = digital pin 4

#define ledPin 13 //Onboard LED = digital pin 13

constintcodeSize = 25; //The size of the code to transmit

intcodeToTransmit[codeSize]; //The array used to hold the RF code

intlightON[]={2,2,2,2,1,4,4,4,4,5,1,4,4,4,4,4,4,5,2,2,1,4,4,4,6}; //The RF codintlightOFF[]={2,2,2,2,1,4,4,4,4,5,1,4,4,4,4,4,4,5,2,2,2,2,2,2,3}; //The RF co

intcodeToggler = 0; //Used to switch between turning the light ON and OFF

inttimeDelay=5; // The variable used to calibrate the RF signal lengths.

voidsetup(){

Serial.begin(9600); // Turn the Serial Protocol ON

pinMode(rfTransmitPin, OUTPUT); //Transmit pin is an output

pinMode(ledPin, OUTPUT);

//LED initialisation sequence - gives us some time to get ready

digitalWrite(ledPin, HIGH);

delay(3000);

digitalWrite(ledPin, LOW);

delay(1000);

}

voidloop(){

toggleCode(); // switch between light ON and light OFF

transmitCode(); // transmit the code to RF receiver on the Fan/Light

timeDelay+=10; //Increment the timeDelay by 10 microseconds with every tr

delay(2000); //Each transmission will be about 2 seconds apart.

}

/*----------------------------------------------------------------

toggleCode(): This is used to toggle the code for turning

the light ON and OFF

-----------------------------------------------------------------*/

voidtoggleCode(){

if(codeToggler){

for(inti = 0; i


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-------------------------------------------------------------------*/

voidtransmitCode(){

// The LED will be turned on to create a visual signal transmission indicato

digitalWrite(ledPin, HIGH);

//initialise the variables

inthighLength = 0;

intlowLength = 0;

//The signal is transmitted 6 times in succession - this may vary with your

for(intj = 0; j


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Now that I have the timeDelay variable, I should be able to simplify the steps required to replicate a remotecontrol RF signal. Maybe there is room for one more tutorial on this topic :)

Update: Here it is - tutorial 4Where you can record and playback an RF signal (without using your computer).

Video

+7 including Gary

Replies

Reply

6 comments:

Rafael 21 July 2014 at 19:02

How far range did you get? May I suggest a tutorial 4: antennas (home made). Thanks for thetutorials!

Reply

Scott C 21 July 2014 at 20:10

Hi Rafael,Without an antenna, I was able to turn the light on and off from the next room. But this

distance is much further than I need. I am not interested in transmitting beyond theboundaries of my house (or that room for that matter). Thank you for the suggestion, Iwould have to seek advice as to whether the use of an antenna would break any laws in

Australia... Perhaps somebody can help me out here and provide some advice. I am notinterested in breaking laws. But if I am legally allowed to, I might do a tutorial on antennas.What about antennas do you want to know?

Anonymous 28 July 2014 at 00:26

I must congratulate you on such a fine blog. I discovered it today and i can't stop reading it. I wish youall the luck in the future works
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Replies

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Reply

Miroslav Jernejek Perec 19 August 2014 at 19:32

Hi Scott,

This. IS. Amazing.

Thank you for your tutorial a 1000 times...I've been busting my brain with the rcswitch library as Ihave 2 different remote socket sets and they work with different protocols and I was able to controlone, but not the other set.

YOU made it work for me! Thank you again.

So i made it a bit simpler for me, but there is a lot of room for improvement, including the scanner thatwould display a code to use, perhaps even with calculated timeDelay.

What I did was to use M$ Excel for code calculation, where I used the combination table, upgraded itaccording to my previously non-working socket (added High medium low) set and used it to calculatecombinations.

I must point out, that the pairs (HI,LO) in your sketch are correct, but not also in the table, as youalready mentioned. I figured out from received timeouts, that pair 0,255 should be 0 for HI and 255for LO as it should be "silent" for a while.

So at this point I have 3+4 sockets, I can control with your code fragments, but it also lets me believewe could replicate almost any "as simple as these" control signal...I still have a wireless doorbell to trywith.

As you already assumed, there should be different t imeDelay lengths as in my case one is 115 andthe other is 150 (middle values).

Keep up the good work and keep in touch.

Best regards,Miroslav J. Perec (mirojp)

Reply

Anonymous 2 December 2014 at 09:22

Hello Scott,

thank you very much for this tutorial and code. I am able to control my RC sockets which I got fromMaplin with the Arduino. Well written tutorial and great effort on your part. Thank you very much, Ican't wait to read trough your blog. Keep up the great work,

best regards,Vlada

Reply

Scott C 2 December 2014 at 10:16

Thanks for your feedback Vlada. I am glad it helped.
http://www.blogger.com/profile/08006184002627076627http://arduinobasics.blogspot.com/2014/07/433-mhz-rf-module-with-arduino-tutorial.html?showComment=1417486563113#c7155155203702965010http://arduinobasics.blogspot.com/2014/07/433-mhz-rf-module-with-arduino-tutorial.html?showComment=1417483324075#c581867709563523443http://www.blogger.com/profile/10071004090415946390http://arduinobasics.blogspot.com/2014/07/433-mhz-rf-module-with-arduino-tutorial.html?showComment=1408447955530#c6520430698987995917


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