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But I'm still curious.. Now that you can print it to the serial, how do you turn it into a datalogger? I knew all of this already. I only came here because I actually need to log the data and read it back in some way (without leaving the serial communication open of course).
I'm a bit late for you, but hopefully I can help someone else.The thing you've experienced is 'debouncing'. The button might make contact for very short amounts of time before properly making contact. This will be interpreted as multiple presses. I don't have enough knowledge to provide a solution, but you can google for 'button debouncing' and find someone who can solve your problem.
This is awesome. I love you you've implemented the newer technologies (laser cutting and 3D printing for example) together with the old camera technology :D
Getting Started With Electronics