Datasheet

Jon Waddington
59
4.3 Infra-red Remote Controller
The waveform in figure 4.3 shows the input to the Propeller from the Infra-Red receiver
when the ‘5’ button is pressed on the remote control.
The two start bits are logic ‘1’, as expected and the toggle bit is also logic ‘1’. This
toggles with every new key press. The address bits are equal to ‘5’. The Information
System does not use this information to distinguish between remote controls. The
command bits are equal to ‘5’, which is the corresponding value for the ‘5’ button on the
remote control.
Each bit period was measured at 1.78ms, just 2μs over the theoretical value. The
Propeller seems very responsive at dealing with the input from the remote control as it
has a cog dedicated to just this task.
0
1
1
1
1
1
1
1
0
0
0
0
0
0
Start Bits
Toggle
Bit
Address Bits
Command Bits
Figure 4.3. Waveform of Input from Infra-Red Receiver