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bs2 and prop communication — Parallax Forums

bs2 and prop communication

eagle4ceseagle4ces Posts: 14
edited 2010-01-26 01:18 in Propeller 1
am trying to communicate with a propeller using a basic stamp.can i connect the i/o pins directly

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2010-01-25 23:46
    You need a 2.2K resistor between the two pins. The Stamps provide a 0V-5V logic signal and the 5V is too high for the Propeller I/O pins which only accept 0V-3.3V. The resistor, by limiting the maximum current to 0.5mA, will allow the Propeller I/O pin to work with the Stamp's I/O pin.
  • JonnyMacJonnyMac Posts: 9,236
    edited 2010-01-26 01:18
    I've done it with open-true baud mode, with a pull-up on the Propeller rx pin to 3.3v (use 4.7K). Per Mike's point, you don't want to use a driven mode without the [noparse][[/noparse]inline] 2.2K resistor to protect the Propeller side.

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    Jon McPhalen
    Hollywood, CA
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