Hi everyone !
I saw this instructable last week and loved it quite much :
I absolutely need/want to do something like this but was thinking about doing it differently.
As i'm almost a total newbie in eletronics i would really appreciate some advices, confirmations, guides, or, basically, any help so i'm sure to do things right.
I indeed don't want to do the exact same thing so i can't just follow the instructable.
In the end i would like to have to tap a specific rythme, put a magnet (or several.?) somewhere, and tap a sequence on a softpot to open up the book.
- Here is the softpot so i can "type" a code by touching a sequence on different places of it.
- I was thinking about using this lighter piezo vibration sensor instead of the one used in the instructable. But maybe the piezo buzzer is a smater choice as i could also do some music but is it really reliable for vibration detection? (i don't need a high precision)
- Here is the Reed switch for magnet detection.
- I was also thinking about using an Arduino mini instead of the PICAXE as i'm more familiar with it.
- This 3.7V 800MaH Lipo battery to power the arduino mini and this Lipo micro usb charger.
- And I'll probably add some circuit opening/close system to reduce battery consuption like he did with his 4x4 switch.
Right now, i'm more or less confident with the above list. I think what i want to do is doable.
If i'm mistaken, let me know 
!
My main problem remains in the motor's choice. The servo is a bit big and asks more voltage than what the battery can offer. And 5V+ batteries are a bit big 
(yeah.. i know.. wanting to have small electronics when you know nothing is probably stupid ^^)
Anyway, I found these stepper motors that have perfect sizes but i can't find any datasheet of it so i don't know the input voltage needed nor its current range ([EDIT] found it, see next message 
) !
Does any of you knows if it feets my needs?
If not, do you have any suggestion of really small motors usable with arduino mini and its 3.3V output?
Thank you !
I wish you all a good day
Cheers !
)