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Random number generation. I run a jumper from TP1 (actually from the lower leg of R3 b/c that is even easier to grab) to the center pin on the PULSE connector (which I don't otherwise use). That feeds the GM pulse into the ICP pin, where I use it to capture the timestamp of the pulse accurately usin...

BTW another 10 bytes of flash space are saved by changing the increment of count [already improved above] to avoid a direct comparison with UINT16_MAX. Instead you increment and skip storing the result if it is zero: --- geiger.c (revision 16) +++ geiger.c (working copy) @@ -112,9 +112,8 @@ ISR(INT0...

'static' helps a little bit in the case of send_report() because it is called only once. So since the function static the compiler knows no outside object file could reference it, and therefore the compiler can inline the function and eliminate the call and any setup/teardown which was needed. Howev...

I found I needed a little more code space than was available in the Atmel for my experiments, so I looked and found places where I could make the existing code smaller without changing its functionality. If you're interested, the patch attached, when applied to 1.00 code, results in 1450 bytes of fl...