Making Things Talk

APPENDIX C 393

Chapter 6

IR transmit example

Language: Wiring/Arduino

This program reads an analog input on pin 0 and sends

the result out as an ASCII-encoded string. The TX line of

the microcontroller is connected to a Rentron TX-IRHS IR

transmitter which can transmit at 19200 bps.

void setup(){

//Open the serial port at 19200 bps:

Serial.begin(19200);

}

void loop(){

// Read the analog input:

int analogValue = analogRead(0);

// send the value out via the transmitter:

Serial.println(analogValue, DEC);

// delay 10ms to allow the analog-to-digital receiver to settle:

delay(10);

}

RF Transmitter

Language: Wiring/Arduino

This program reads an analog input on pin 0 and sends the

result out as an ASCII-encoded string. The TX line of the

microcontroller is connected to an RF transmitter that is

capable of reading at 2400 bps.

void setup(){

// Open the serial port at 2400 bps:

Serial.begin(2400);

}

void loop(){

// Read the analog input:

int analogValue = analogRead(0);

// send the value out via the transmitter:

Serial.println(analogValue, DEC);

// delay 10ms to allow the analog-to-digital receiver to settle:

delay(10);

}

RF Receive

Language: Processing

This program listens for data coming in through a serial

port. It reads a string and throws out any strings that

contain values other than ASCII numerals, linefeed, or

carriage return, or that are longer than four digits. ...