problem with the GSM controller

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  1. - 30th May 2009, 00:37 #1
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    HSERIN likes to idle in a HIGH state, so even without the "amplifier" it requires a pull up resistor, or it just locks up on boot.
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  2. - 30th May 2009, 10:44 #2
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    @malwww, with the integrated USART i don't need them, because PIC and GSM works on the "same" signal voltage.

    I tried the pull up without the "amp" but the GSM voltage is to low, and the PIC won't them recognize again!

    I have no more ideas, helpppp!!
  3. - 30th May 2009, 20:33 #3
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    Quote Originally Posted by Dariolo View Post

    I tried the pull up without the "amp" but the GSM voltage is to low, and the PIC won't them recognize again!

    I have no more ideas, helpppp!!
    So lower the voltage your PIC is operating on. The data sheet says the PIC you have selected will operate on voltages from 2.0 to 5.5 volts
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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