28139 Parallax Inc, 28139 Datasheet - Page 175
28139
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
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Appendix A: IR Remote AppKit Documentation · Page 165
Handheld Remote Infrared Messages
Excerpt from IR Remote for the Boe-Bot text
®
The examples here will rely on the protocol universal remotes use to control SONY
TV
sets. This protocol strobes the IR thirteen times with roughly half a 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
being 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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