com.ridgesoft.intellibrain
Class IntelliBrainIrReceiver

java.lang.Object
  com.ridgesoft.intellibrain.IntelliBrainIrReceiver

All Implemented Interfaces:

IrReceiver

public class IntelliBrainIrReceiver
extends Object
implements IrReceiver

Class to interface to the infrared receiver on the IntelliBrain main board.

The infrared receiver senses infrared light modulated at 38 kHz, which is the frequency many TV and home electronics remote controls use.

The infrared receiver can be used to:

• receive input from an infrared (TV) remote control
• detect objects by sensing reflections of infrared signals transmitted by a 38 kHz modulated infrared LED
• send signals between robots

This class implements the IrReceiver interface, which enables it to receive input from a infrared remote control. To do so, use this class in conjunction with a class such as the SonyIrRemote class.

This class also provides a method to detect if the IR receiver is currently receiving a 38 kHz modulated infrared signal. This can be used to detect objects by sensing reflections of modulated infrared light transmitted from a 38 kHz modulated infrared LED.

The IntelliBrain expansion board includes a modulated LED and provides for two modulated infrared LEDs to be added and controlled using digital ports 17 and 18.

By using modulated infrared signals, the receiver is much less susceptible to interference from ambient infrared light.

See Also:

SonyIrRemote, Mvp1IrRemote, IntelliBrain.getIrReceiver(), IntelliBrain.getExpansionIrLed(), IntelliBrainExpDigitalIO, IntelliBrainExpDigitalIO.setModulatedOutput()

Method Summary

void	initialize(int startMin, int startMax, int shortMin, int threshold, int longMax, int numberOfBits, boolean invertBits, boolean reverseBits) Initializes the infrared receiver.
boolean	isReceiving() Sample this digital input from the IR demodulator.
int	read() Reads the next received value from the receiver if data is available.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait

Method Detail

initialize

public void initialize(int startMin,
                       int startMax,
                       int shortMin,
                       int threshold,
                       int longMax,
                       int numberOfBits,
                       boolean invertBits,
                       boolean reverseBits)

Initializes the infrared receiver.

The infrared receiver supports infrared protocols which transmit data by transmitting a long start pulse followed by short and long data bit pulses.

Specified by:

initialize in interface IrReceiver

Parameters:

startMin - minimum start bit time in microseconds

startMax - maximum start bit time in microseconds

shortMin - minimum short pulse duration in microseconds

threshold - duration threshold distinguishing a short pulse from a long pulse

longMax - maximum long pulse duration in microseconds

numberOfBits - number of data bits following the start bit

invertBits - true if short pulses are ones, false if short pulses are zeros

reverseBits - true if data is transmitted least significant bit first

isReceiving

public boolean isReceiving()

Sample this digital input from the IR demodulator.

Returns:

true if the input bit is set, otherwise false

read

public int read()

Reads the next received value from the receiver if data is available. This method returns -1 if there is no data.

Specified by:

read in interface IrReceiver

Returns:

value received since the last call or -1 if no new data has been received