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TOPIC: Can you use a previously bootloaded Atmega328P?

Can you use a previously bootloaded Atmega328P? 3 weeks 3 days ago #1814

  • Coelhomatias
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Hi, so i finished my build and tested all the voltages and all checks out, but then i realised i had to put the Atmega running on its inside 8MHz clock! I tried using your tutorial, other tutorials and so many things and failed every time. I'm using a chip that i took out of a arduino uno board, so my question is, can you burn the 8Mhz bootloader on an Atmega328p-PU that had another bootloader previously burned into it?
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Coelhomatias
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Can you use a previously bootloaded Atmega328P? 2 weeks 5 days ago #1817

  • Ray
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Using an ATMEGA328P-PU out of the Arduino UNO board wont work, as they are programmed to work on a 16MHz external clock.
We have tutorials to do it here:
www.electrosmash.com/forum/time-manipula...-manipulator?lang=en
And also Arduino has tutorials in their site:
www.arduino.cc/en/Tutorial/ArduinoToBreadboard
This guy has a nice tutorial on Youtube:


Your question:
can you burn the 8Mhz bootloader on an Atmega328p-PU that had another bootloader previously burned into it?
YES, you can burn anything on an ATMEGA328, even if it had another bootloader before. Burning a new bootloader will erase the previous one (is like writing in a memory card).

Another hardware approach is to solder a 16MHz clock with 2 caps into the Time MAnipulator board, so you could use a uC directly taken from an Arduino Board, but you would need to be pretty good soldering to do it in the board....
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