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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

    Are you trying to program the ATMega328p with the Arduino Uno board  as shown in the above examples?

    Or are you programming the onboard chip of the Arduino Uno board?

    Do you have a schematic or a picture so I can see what you are trying to doing.

    Reason being if you set the wrong fuses on the chip it can be rendered useless, meaning you will be locked out and you can't read nor reprogram it.

    So be careful.

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  • sparky2k7
    0 sparky2k7 over 10 years ago

    Are you trying to program the ATMega328p with the Arduino Uno board  as shown in the above examples?

    Or are you programming the onboard chip of the Arduino Uno board?

    Do you have a schematic or a picture so I can see what you are trying to doing.

    Reason being if you set the wrong fuses on the chip it can be rendered useless, meaning you will be locked out and you can't read nor reprogram it.

    So be careful.

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