29122 Parallax Inc, 29122 Datasheet - Page 2

• Manufacturer Part Number: 29122
• Description: KIT PARTS IR REMOTE FOR BOE-BOT
• Manufacturer: Parallax Inc

Specifications of 29122

• Accessory Type: IR Remote
• 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

The examples here will rely on the protocol that universal remotes use to control SONY
protocol strobes the IR thirteen times with roughly a half-millisecond rest between each pulse. It results in
thirteen negative pulses from the IR detector that the BASIC Stamp can easily measure. The first pulse is
the start pulse, which lasts for 2.4 ms. The next twelve pulses will either last for 1.2 ms (binary-1) or 0.6
ms (binary-0). The first seven data pulses contain the IR message that indicates which key is pressed.
The last five pulses contain a binary value that specifies whether the message is intended to be sent to a
TV, VCR, CD, DVD player, etc. The pulses are transmitted in LSB-first order, so the first data pulse is
bit-0, the next data pulse is bit-1, and so on. If you press and hold a key on the remote, the same
message will be re-sent after a 20 to 30 ms rest.
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Resting state
between message
packets = 20-30 ms
duration = 2.4 ms
Start pulse
Start
Resting states
between data pulses
= 0.6 ms
Bit-0
Binary-0
data pulse
durations = 0.6 ms
0
Bit-1
0
Bit-2
0
Bit-3
0
Bit-4
0
© 2004 Parallax Inc. • IR Remote AppKit (#29122) • 10/2004
Bit-5
Binary-1
data pulse
durations = 1.2 ms
1
Bit-6
0
Bit-7
1
Bit-8
0
Bit-9
0
Bit-10
0
Bit-11
0
IR Message Timing
Diagram
Values are approximate
and will vary from one
remote to the next
Handheld Remote
Infrared Messages
Excerpt from IR
Remote for the Boe-
Bot text.
®
TV sets. This