RF 315/433 MHz Transmitter-receiver Module and Arduino?

Projects Programming
1

i but this: http://www.instructables.com/id/RF-315433-MHz-Transmitter-receiver-Module-and-Ardu/

but i haven't a idea to connect or the code to write for test this.. i start whit the trasmitter and i try to trasmit a signal in my icom radio scanner..
i install the virtualwire.h library but i want trasmit an inpulse not a message.. no one can help me write the code?and connect the trasmitter? to send a inpulse in my icom scanner

2

i but this

You did what?

but i haven't a idea to connect

Why not? There are pictures in step 2. It hardly gets any simpler.

or the code to write for test this.

The code is in step 3.

i start whit the trasmitter and i try to trasmit a signal in my icom radio scanner..

Scanners don't detect signals by themselves. Signals that change are what a scanner detects.

but i want trasmit an inpulse not a message.

What you think you want to do and what is reasonable to do may not be the same thing at all. Start with explaining what you are trying to accomplish, NOT how you think you should do it.

no one can help me write the code?

Not without understanding the requirements, which you haven't described.

and connect the trasmitter? to send a inpulse in my icom scanner

There% was* a) picture$. How@ much! more+ do( you# need?

Don't splatter punctuation marks all over the place. Do use capital letters appropriately.

3

i try to send a signal in my icom radio scanner..

i find the correct code

#include <VirtualWire.h>

void setup()
{
    Serial.begin(9600);   // Debugging only
    Serial.println("setup");

    // Initialise the IO and ISR
    //vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000);  // Bits per sec
}

void loop()
{
    const char *msg = "hello";

    digitalWrite(13, HIGH); // Flash a light to show transmitting
    vw_send((uint8_t *)msg, strlen(msg));
    vw_wait_tx(); // Wait until the whole message is gone
    digitalWrite(13, LOW);
    delay(200);
}

but this trasmin in wfm i want trasmit in am... i'm not english sorry for mistake.. but in my language not is simple...

4

but this trasmin in wfm i want trasmit in am..

You can not transmit in AM using a FM transmitter it is not possible.

5

I found this video helpful. It lets you understand and write your own communication system using RF transmitters and receivers.

And here is a simple code that is more explanatory the video provides.
https://code.google.com/p/rf85/

Using Virtual Wire library is a real pain in the but.

6

Can these RF 315/433 MHz Transmitter-receiver Modules send and receive Amplitude Modulated (AM) signals the could be outputted to an external speaker?

Also, could these modules be modified to work @ 900 MHz?

7

Can these RF 315/433 MHz Transmitter-receiver Modules send and receive Amplitude Modulated (AM) signals the could be outputted to an external speaker?

What signal are you planning to modulate the amplitude of?

Also, could these modules be modified to work @ 900 MHz?

No.

8

hello. im a beginner in using arduino. how do i program it so that whenever the arduino gets an input of 1, the transmitter will send a signal to the receiver. im using the program below, but instead of blinking lights id like to have a steady light. pls help

for Transmitter
#include <VirtualWire.h>

void setup()
{
Serial.begin(9600); // Debugging only
Serial.println("setup");

// Initialise the IO and ISR
vw_set_ptt_inverted(true); // Required for DR3100
vw_setup(2000); // Bits per sec
vw_set_tx_pin(3);

pinMode(8, INPUT);
pinMode(9, INPUT);
pinMode(10, INPUT);
pinMode(11, INPUT);

digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
digitalWrite(10, HIGH);
digitalWrite(11, HIGH);

}

void loop()
{
char *msg;

if(digitalRead(8) == LOW){
char *msg = "1";
digitalWrite(13, true); // Flash a light to show transmitting
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(13, false);}
if(digitalRead(9) == LOW){
char *msg = "2";
digitalWrite(13, true); // Flash a light to show transmitting
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(13, false);}
if(digitalRead(10) == LOW){
char *msg = "3";
digitalWrite(13, true); // Flash a light to show transmitting
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(13, false);}
if(digitalRead(11) == LOW){
char *msg = "4";
digitalWrite(13, true); // Flash a light to show transmitting
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(13, false);}
}

for receiver
#include <VirtualWire.h>

void setup()
{
Serial.begin(9600); // Debugging only
Serial.println("RECEIVER");

// Initialise the IO and ISR
vw_set_ptt_inverted(true); // Required for DR3100
vw_setup(2000); // Bits per sec
vw_set_rx_pin(2);
vw_rx_start();

pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);

pinMode(11, OUTPUT);
}

void loop()
{

digitalWrite(8, LOW);
digitalWrite(9, LOW);

digitalWrite(10, LOW);
digitalWrite(11, LOW);

uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;

if (vw_get_message(buf, &buflen)) // Non-blocking
{
int i;

digitalWrite(13, true); // Flash a light to show received good message
// Message with a good checksum received, dump it.
Serial.print("Received: [");

for (i = 0; i < buflen; i++)
{
Serial.print(buf*);*

// if(buf == '1'){digitalWrite(8, HIGH);}
// if(buf == '2'){digitalWrite(9, HIGH);}
// if(buf == '3'){digitalWrite(10, HIGH);}
// if(buf == '4'){digitalWrite(11, HIGH);}
// Serial.print(" ");
* }*

* Serial.print("] strength(");*
* int sensorValue = analogRead(A1);*
* Serial.print(sensorValue);*
* Serial.println(")");*

* digitalWrite(13, false);*

* }*
}

9

The code that you improperly posted does something. You failed to describe what it does. How what it does differs from what you want is not clear.