28139 Parallax Inc, 28139 Datasheet - Page 192

• Manufacturer Part Number: 28139
• Description: KIT REMOTE IR FOR BOE-BOT W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28139

• Accessory Type: IR Remote
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Boe-Bot®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

How TransmitCustomIrMessage.bs2 Works
Here is a hard-coded example of sending the number 9 with the circuit shown in Figure
B-1 and the protocol introduced in this activity. The number 9 in binary is %00001001.
Since the protocol sends the bits LSB-first, it means the rightmost digit is sent first, then
the second digit from the right, and so on until the leftmost of the eight digits is sent. The
Duration argument in the each of the
transmits 38 kHz. Each duration is either 3 (3 ms for the start pulse), 2 (2 ms for a
binary-1) or 1 (1 ms for a binary-0). A
ensures that the receiving BASIC Stamp will have time to process the bit and move on to
the next.
TransmitCustomIrMessage.bs2 has a subroutine that makes transmitting IR bytes much
easier and more versatile than hard coding. All you have to do is set the
variable to the value you want to send, and then call the
FOR counter = 0 TO 7
NEXT
RETURN
IF irMessage.LOWBIT(counter) = 1 THEN
ENDIF
FREQOUT IrLedPin,duration,IrFreq
PAUSE BtwnPulses
ELSE
FREQOUT 8, 3, 38000
PAUSE 1
FREQOUT 8, 2, 38000
PAUSE 1
FREQOUT 8, 1, 38000
PAUSE 1
FREQOUT 8, 1, 38000
PAUSE 1
FREQOUT 8, 2, 38000
PAUSE 1
FREQOUT 8, 1, 38000
PAUSE 1
FREQOUT 8, 1, 38000
PAUSE 1
FREQOUT 8, 1, 38000
PAUSE 1
FREQOUT 8, 1, 38000
duration = 2
duration = 1
' Start pulse
' Bit-0 = binary-1
' Bit-1 = binary-0
' Bit-2 = binary-0
' Bit-3 = binary-1
' Bit-4 = binary-0
' Bit-5 = binary-0
' Bit-6 = binary-0
' Bit-7 = binary-0
FREQOUT
PAUSE
commands controls how long each it
1 between each
Transmit_Ir_Byte
FREQOUT
irMessage
subroutine.
command