Datasheet

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If possible limit the current from your power source to a few milli-amps. I managed to blow a
fuse of my meter performing the measurements because I accidentally shorted the supply when
placing the probe on the battery holder.
4.7 Atmega-48 LED trick
If you are debugging, an LEDs is often the first tool you reach for. But the Atmega-48 does not
have any LEDs. However the Atmega-328 does! There are two ways in which you can use these
LEDs :
• The safest way is to remove the 328 from its socket.
• The second way is to erase the 328 so that all its pins are inputs.
You can then use the connectors to feed a signal to an LED. Simplest way is to use a female-
male strap between connector J10 and e.g. pins, 2,3 or 6 of J14.