PIC16F917 - Not reading input

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  1. - 15th July 2008, 20:59 #5
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    Quote Originally Posted by freddayz View Post
    What do you have A.7 connected to? >>>I have it connected to a GPIO which outputs 3.3VDC
    Well, that isn't going to be near enough voltage to connect into an RS232 port on a PC... A 5v signal is just barely enough, but seems to work in most cases. Either need to bump up to 5v or use a 3v-compatible MAX232-type chip in the middle.

    And the internal OSC may not be good enough for serial. What are you sending to? >>>I am sending to the com port on the PC, it outputs the message i want.
    Internal oscillators are sometimes accurate enough for serial communications, sometimes not. Best bet is to use an external oscillator.
    Last edited by skimask; - 15th July 2008 at 21:21.
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