next topic »

[on:]

Hi Nick,

I made a 328P-PU Arduino compatible minimal board based on your super tutorial
http://www.gammon.com.au/forum/?id=11637

I uploaded:
 - "board detector" sketch
 - bootloader programming sketch (8 MHz without a crystal)
Everything went well and I finally loaded up the basic Blink example

...
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(2000);               // wait for 2 seconds
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(2000);               // wait for 2 seconds
...

The LED turn ON for 4 seconds and OFF for 4 seconds
What am I doing wrong ??
Is it related to the 8 MHz clock ??

Thanks for your assistance

[Reply #1 on:]

Is you chip running of an external crystal? or off the internal clock? It sounds like you compiled the program using a configuration that is expecting a 16Mhz clock, but it is actually running a 8Mhz clock.

[Reply #2 on:]

The chip is running 8Mhz from the internal clock

Based on your comments, I changed board for the LilyPad Arduino w/ ATmega328 (8MHz)
and all is well   

Thanks for your help