I made a twinkling star ornament using 80 ultra-brite LEDs
and using an atmega168 to generate random 8bit values at
PORT D. The port switches 8 transistors on/off and that makes
the LEDs twinkle.
I hung it in the porch window last night and when the temp got
down to the 40's it simply froze with all the leds ON.
When I brought it back inside and warmed it up a bit it again
The atmega168 is running using the internal rc oscillator...is this
perhaps what is wrong? will cold temperatures mess up the rc osc
so badly it will simply freeze a running program?