I never used an Arduino or a Raspberry Pi before. This is my first project of this kind.
At work we have a table football that is used quite intensively.
I would like to tape up a device hidden below it that would record when games are played. Then, in 6 months, when I would have accumulated enough data, I will publish a statistical analysis of our office's table football activity.
I'm thinking of two ways to sense whether a game is currently played or not: capt vibrations using an accelerometer or record sound (it would be very easy to detect the sound of the ball shocks).
I much prefer the first solution for 2 reasons: (1) lower frequency, so cheaper to store/transfer, (2) I am not recording my colleagues' voices, which could be considered illegal. Also, I imagine an accelerometer uses less power than a microphone, but that might be false.
I am concerned about the power supply of the device. I would like to record for months, without having to recharge the battery too often. I'm willing to buy an external battery, like a TeckNet PowerZen 16750mAh, but I'm not even sure that can be used to charge an Arduino.
So, I have many questions unanswered and I need the experts.
How would YOU do it?