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Arduino Forum Setting Arduino Uno fuses
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  • arduino
Related

Setting Arduino Uno fuses

gtrplyer16
gtrplyer16 over 10 years ago

All,

 

I have been working on a project lately which is an ATMega328p controlled power supply. I programmed the chip using the Arduino Uno board and I want to use a 16MHz crystal instead of the onboard 8MHz oscillator. I've been doing some research and people are saying I need to set fuses, but I'm not sure how to go about doing that. I only ran into this problem because I set up a 16MHz oscillator with 22pF caps and a 10k resistor and I was getting no clock signal into the chip. I downloaded the schematic from Arduino.cc and it showed to hook up my crystal across XTAL1 and XTAL2 and that's what I did and looking at those two pins on a scope I am getting 5V on the pins but it stays high. If someone could let me know if that would be a wiring problem or something different like setting fuses for example. This is my first project while using the ATMega328p out of the Arduino board so I'm having some troubles.

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  • gadget.iom
    gadget.iom over 10 years ago in reply to gtrplyer16 +1
    Take a look at the breadboard examples here: http://arduino.cc/en/Tutorial/ArduinoISP
  • sparky2k7
    sparky2k7 over 10 years ago +1
    Is this what you are trying to do? See link below. http://heliosoph.mit-links.info/arduinoisp-reading-writing-fuses-atmega328p/
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  • sparky2k7
    0 sparky2k7 over 10 years ago

    Just to let you know that the Arduino Uno is not a programmer, the onboard chip is pre-programmed to be recognized by the Arduino software and operating system you are using. I hope you didn't delete the program that was on your onboard chip that came with the Arduino Uno.

    If you need to program AVR chip you will need a programmer like a USBTiny or  AVRISP mkIl.

     

    To create a stand alone project you need to use the following example shown in http://heliosoph.mit-links.info/arduinoisp-reading-writing-fuses-atmega328p/

    Send pictures.....

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  • gtrplyer16
    0 gtrplyer16 over 10 years ago in reply to sparky2k7


    Sorry for the awkward angles that's the best I could do today. I didn't really have time to get good pics. I didn't delete the program that came on the Uno I uploaded my code to the ATMega328P-PU and put it into the circuit for it to run. I will take a look at the example when I get a chance.imageimage

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  • gtrplyer16
    0 gtrplyer16 over 10 years ago in reply to sparky2k7


    Sorry for the awkward angles that's the best I could do today. I didn't really have time to get good pics. I didn't delete the program that came on the Uno I uploaded my code to the ATMega328P-PU and put it into the circuit for it to run. I will take a look at the example when I get a chance.imageimage

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  • sparky2k7
    0 sparky2k7 over 10 years ago in reply to gtrplyer16

    Sorry, I can't zoom in on your pictures, there just to small to read.

    Please send better pictures.

    Do you have an extra ATMega328P-PU or just the one that came with the Uno.

    You are writing a sketch with the Arduino IDE software, correct.

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