28139 Parallax Inc, 28139 Datasheet - Page 64

• 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

Page 54 · IR Remote for the Boe-Bot
Figure 2-5 shows a timing diagram of the signal the IR receiver sends to the BASIC
Stamp I/O pin as it indicates when it does and does not detect 38 kHz infrared transmitted
by IR remote.
Figure 2-5: Command Execution Timing in Relation to Incoming IR Pulses
The gray boxes over the timing diagram show the beginning and end of each PBASIC
command. Keep in mind that the durations of the low signals are what contain the
information. There's a 2.4 ms start pulse, followed by a 0.6 ms data bit 0 pulse. 0.6 ms is
a binary-0. The next data bit 1 pulse is low for 1.2 ms, which means it's a binary-1. The
bit 2 data pulse is 0.6 ms again, so it is also a binary zero.