I am learning about the Parallax Propeller P8X32A by experimenting with an ActivityBot360 Kit and following (a) Propeller C Programming with the ActivityBot, (b) Propeller Education Kit Labs Fundamentals, together with the Propeller Manual, and (c) Programming and Customizing the Multicore Propeller Microcontroller (chapters 1, 2, 3, and 4).
In (a), Navigate by Infrared Flashlights, the wiring diagrams, schematics, and parts lists show 220 Ohms from the IR receiver to the Propeller microcontroller. Is 220 Ohms enough to protect the propeller from the 5 Volt signals emanating from the detector? I ask because in references (b) and (c) above the value of the protection resistor is 10 K Ohms. I have performed the relevant PEK Labs experiments (using 10K Ohms) and find that they work reasonably well.
Digression: I have performed the IR Distance Detection with NCO and Duty Sweep (page 156 of reference (b)) using the AB360 Kit, but without connecting the D/A facility provided by the WX board. The results are fair but in need of averaging to smooth things out .... Once I sort the resistor problem, I will use the D/A facility to see if the results are smoother.
Another digression: The PEK Labs is fantastic. Hope you produce something similar for the P2.
Many thanks for making such good quality products with excellent support.