Custom firmware for SparkFun geiger counter (http://www.sparkfun.com/products/10742) with an attached SparkFun LCD kit (http://www.sparkfun.com/products/9395). Designed to allow the geiger counter to be used without a computer - I am using mine with an external Mophie powerpack.
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Supports attached 16x2 LCD on TX pin
First line: count/second and peak count/second
Second line: count/minute and peak count/minute
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Count/minute calculated based on last 60 samples
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Uses interrupts for updating UART, etc; as few busy/wait loops as possible
- LCD line will overflow if c/s or c/m greater than 999
- SparkFun SerLCD 2.5 control characters will need to be filtered out if using computer to capture output via USB
Inspired by aaron's original firmware (http://github.com/a1ronzo/SparkFun-Geiger-Counter) but re-written to be almost entirely interrupt based instead of polling/delay loops.
All files are released under Creative Commons Attribution: http://creativecommons.org/licenses/by/3.0/