PIC16F917 - Not reading input

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  1. - 15th July 2008, 21:59 #1
    skimask's Avatar
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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 22:21.
  2. - 15th July 2008, 22:48 #2
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    freddayz
    freddayz is offline Junior Member
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    I guess my question is not clear then...
    I am trying to program RA7 on the PIC16F917 as an input with no success all I read is 0
  3. - 15th July 2008, 22:57 #3
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    mackrackit
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    As Joe mentioned about the ADC.
    Take a look at this:
    http://www.picbasic.co.uk/forum/showthread.php?t=561
    Dave
    Always wear safety glasses while programming.
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