Arduino.Se is closed, and unfortunately for me, I only trust SE users. The last time i asked on this site, my question was stupid or dump or does not belong here, to say the least. I have another question about arduino question which is probably going to be labeled as a shopping question and closed. unfortunately for me, this is the only SE site which accepts arduino questions.
I am not afraid of my question being downvoted or closed, after all i don't have high rep to care about. But out of respect to this community, I learned to ask on meta first whenever i feel that my question isn't fit for the main site, especially that arduino isn't the main subject on this site. So my question is as follows:
I'm doing an arduino uno project and i need to control some motors using my mobile phone through bluetooth. I contacted an arduino reseller in my country and he said that he has bluetooth shield for 16$ and bluetooth module for 40$, i don't know which one to buy.
To make things even more confusing, this guy has done something similar to what i wanted to do
using this which is only around 6$
but i've also seen other projects that are done using the shield, so what to buy? I don't really care about the price, i am willing to pay, but i don't know which one to buy.
At first i thought that arduino bluetooth shield is a shield (cover) that protects the module but this guy was able to connect arduino using the shield only.
my questions are: what is the difference between the shield and the module? what are the differences between different arduino bluetooth modules? What do you usually buy to connect an android device to arduino using bluetooth?
Can I ask this on the main site? it's really not a shopping question because i don't really care about the price, i can buy anything, it's just that, it's so confusing to pick the right one since there are just so many options. I'm willing to take few downvotes, if my question is on topic and if i get good answers, i don't care about my rep, at least not on this site, but I don't want it to be closed.