Using Short Range RF Transmissions Between Two Arduinos

A quick tutorial on how to send/receive RF signals to communicate between two Arduino devices (433MHz AM).

Feb 23, 2017

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Components and supplies

Arduino UNO

QAM-TX1

QAM-RX2

HT-12D

HT-12E

Tools and machines

Soldering iron (generic)

Apps and platforms

Arduino IDE

Project description

Code

Code snippet #2

text

1
2#define PIN_RECEIVE 10
3#define PIN_DATA 11
4
5/***************************************************************/
6/*   Function: setup()                                           */
7/***************************************************************/
8void   setup()
9{
10	Serial.begin(9600);
11	Serial.println("setup()");
12
13	pinMode(PIN_RECEIVE,   INPUT);
14	pinMode(PIN_DATA, INPUT);
15}
16
17/***************************************************************/
18/*   Function: loop()                                            */
19/***************************************************************/
20void   loop()
21{
22	Serial.println("loop()");
23
24	if (digitalRead(PIN_RECEIVE)   == HIGH)
25	{
26		Serial.println("Receiving Message");
27
28		if (digitalRead(PIN_DATA)   == HIGH)
29			Serial.println("- Message 2");
30		else
31			Serial.println("-   Message 1");
32	}
33
34	delay(100);
35}
36

#define PIN_RECEIVE 10
#define PIN_DATA 11

/***************************************************************/
/*   Function: setup()                                           */
/***************************************************************/
void   setup()
{
	Serial.begin(9600);
	Serial.println("setup()");

	pinMode(PIN_RECEIVE,   INPUT);
	pinMode(PIN_DATA, INPUT);
}

/***************************************************************/
/*   Function: loop()                                            */
/***************************************************************/
void   loop()
{
	Serial.println("loop()");

	if (digitalRead(PIN_RECEIVE)   == HIGH)
	{
		Serial.println("Receiving Message");

		if (digitalRead(PIN_DATA)   == HIGH)
			Serial.println("- Message 2");
		else
			Serial.println("-   Message 1");
	}

	delay(100);
}

Code snippet #1

text

1
2#define PIN_TRANSMIT 3
3#define PIN_DATA 4
4
5/***************************************************************/
6/*
7  Function: setup()                                           */
8/***************************************************************/
9void
10  setup()
11{
12	Serial.begin(9600);
13	Serial.println("setup()");
14
15	pinMode(PIN_TRANSMIT,
16  OUTPUT);
17	pinMode(PIN_DATA, OUTPUT);
18}
19
20/***************************************************************/
21/*
22  Function: loop()                                            */
23/***************************************************************/
24void
25  loop()
26{
27	Serial.println("loop()");
28
29	Serial.println("Transmitting
30  Message 1");
31
32	digitalWrite(PIN_DATA, HIGH); // Message 1
33	digitalWrite(PIN_TRANSMIT,
34  HIGH);
35
36	delay(100);
37
38	digitalWrite(PIN_TRANSMIT, LOW);
39
40	//
41  Wait 10 seconds between messages
42	delay(10000);
43
44	Serial.println("Transmitting
45  Message 2");
46
47	digitalWrite(PIN_DATA, LOW); // Message 2
48	digitalWrite(PIN_TRANSMIT,
49  HIGH);
50
51	delay(100);
52
53	digitalWrite(PIN_TRANSMIT, LOW);
54
55	//
56  Wait 10 seconds between messages
57	delay(10000);
58}
59

#define PIN_TRANSMIT 3
#define PIN_DATA 4

/***************************************************************/
/*
  Function: setup()                                           */
/***************************************************************/
void
  setup()
{
	Serial.begin(9600);
	Serial.println("setup()");

	pinMode(PIN_TRANSMIT,
  OUTPUT);
	pinMode(PIN_DATA, OUTPUT);
}

/***************************************************************/
/*
  Function: loop()                                            */
/***************************************************************/
void
  loop()
{
	Serial.println("loop()");

	Serial.println("Transmitting
  Message 1");

	digitalWrite(PIN_DATA, HIGH); // Message 1
	digitalWrite(PIN_TRANSMIT,
  HIGH);

	delay(100);

	digitalWrite(PIN_TRANSMIT, LOW);

	//
  Wait 10 seconds between messages
	delay(10000);

	Serial.println("Transmitting
  Message 2");

	digitalWrite(PIN_DATA, LOW); // Message 2
	digitalWrite(PIN_TRANSMIT,
  HIGH);

	delay(100);

	digitalWrite(PIN_TRANSMIT, LOW);

	//
  Wait 10 seconds between messages
	delay(10000);
}

Code snippet #2

text

1
2#define PIN_RECEIVE 10
3#define PIN_DATA 11
4
5/***************************************************************/
6/*  Function: setup()                                           */
7/***************************************************************/
8void  setup()
9{
10	Serial.begin(9600);
11	Serial.println("setup()");
12
13	pinMode(PIN_RECEIVE,  INPUT);
14	pinMode(PIN_DATA, INPUT);
15}
16
17/***************************************************************/
18/*  Function: loop()                                            */
19/***************************************************************/
20void  loop()
21{
22	Serial.println("loop()");
23
24	if (digitalRead(PIN_RECEIVE)  == HIGH)
25	{
26		Serial.println("Receiving Message");
27
28		if (digitalRead(PIN_DATA)  == HIGH)
29			Serial.println("- Message 2");
30		else
31			Serial.println("-  Message 1");
32	}
33
34	delay(100);
35}
36

#define PIN_RECEIVE 10
#define PIN_DATA 11

/***************************************************************/
/*  Function: setup()                                           */
/***************************************************************/
void  setup()
{
	Serial.begin(9600);
	Serial.println("setup()");

	pinMode(PIN_RECEIVE,  INPUT);
	pinMode(PIN_DATA, INPUT);
}

/***************************************************************/
/*  Function: loop()                                            */
/***************************************************************/
void  loop()
{
	Serial.println("loop()");

	if (digitalRead(PIN_RECEIVE)  == HIGH)
	{
		Serial.println("Receiving Message");

		if (digitalRead(PIN_DATA)  == HIGH)
			Serial.println("- Message 2");
		else
			Serial.println("-  Message 1");
	}

	delay(100);
}

Code snippet #1

text

1
2#define PIN_TRANSMIT 3
3#define PIN_DATA 4
4
5/***************************************************************/
6/*  Function: setup()                                           */
7/***************************************************************/
8void  setup()
9{
10	Serial.begin(9600);
11	Serial.println("setup()");
12
13	pinMode(PIN_TRANSMIT,  OUTPUT);
14	pinMode(PIN_DATA, OUTPUT);
15}
16
17/***************************************************************/
18/*  Function: loop()                                            */
19/***************************************************************/
20void  loop()
21{
22	Serial.println("loop()");
23
24	Serial.println("Transmitting  Message 1");
25
26	digitalWrite(PIN_DATA, HIGH); // Message 1
27	digitalWrite(PIN_TRANSMIT,  HIGH);
28
29	delay(100);
30
31	digitalWrite(PIN_TRANSMIT, LOW);
32
33	//  Wait 10 seconds between messages
34	delay(10000);
35
36	Serial.println("Transmitting  Message 2");
37
38	digitalWrite(PIN_DATA, LOW); // Message 2
39	digitalWrite(PIN_TRANSMIT,  HIGH);
40
41	delay(100);
42
43	digitalWrite(PIN_TRANSMIT, LOW);
44
45	//  Wait 10 seconds between messages
46	delay(10000);
47}
48

#define PIN_TRANSMIT 3
#define PIN_DATA 4

/***************************************************************/
/*  Function: setup()                                           */
/***************************************************************/
void  setup()
{
	Serial.begin(9600);
	Serial.println("setup()");

	pinMode(PIN_TRANSMIT,  OUTPUT);
	pinMode(PIN_DATA, OUTPUT);
}

/***************************************************************/
/*  Function: loop()                                            */
/***************************************************************/
void  loop()
{
	Serial.println("loop()");

	Serial.println("Transmitting  Message 1");

	digitalWrite(PIN_DATA, HIGH); // Message 1
	digitalWrite(PIN_TRANSMIT,  HIGH);

	delay(100);

	digitalWrite(PIN_TRANSMIT, LOW);

	//  Wait 10 seconds between messages
	delay(10000);

	Serial.println("Transmitting  Message 2");

	digitalWrite(PIN_DATA, LOW); // Message 2
	digitalWrite(PIN_TRANSMIT,  HIGH);

	delay(100);

	digitalWrite(PIN_TRANSMIT, LOW);

	//  Wait 10 seconds between messages
	delay(10000);
}

Downloadable files

Transmit Circuit

Receive Circuit

Transmit Circuit

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