28119 Parallax Inc, 28119 Datasheet - Page 104

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

Specifications of 28119

• Lead Free Status: Contains lead
• Accessory Type: Oscilloscope
• Interface Type: USB
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The pulse train generated by pressing 5 on the remote control is shown in Figure 7-11.
You can see that the 10-bit wide data is transmitted LSB (least significant bit) first.
You should see the same data in your Debug Terminal (Figure 7-12). The program first
looks for the start pulse then counts the 10 pulses for each bit. The value of each bit is
listed.
From this we can demodulate the value of the data transmitted. The last four bits don’t
change so they are omitted. What we are left with is an 8-bit value of the demodulated
signal. You could use this to instruct the BASIC Stamp to do different tasks by the
remote control, or to send data between two BASIC Stamps.
Figure 7-12:
Decoding
keypress 5 on
a Sony
remote