external sensors

[nub]

i have a nanowii board but would like to add some features to it like alt hold and maybe some GPS functions, alt hold being the 1st thing i would like to address.

after a little reading i have idea of what i';m looking for but want to double check before buying it, its a BMP085 barometer, are these any good, do they do the job well? they seem quite cheap.

also take it i would just be adding some code into my current sketch to use it?

thx.

oh and also if i wanted to add more than one external sensor, do i just connect them in parallel to the board? there';s only one set of input pins.

update:

well ended up buying it was only £6

seems like its just a case of defining it and assigning it to a switch in multiwiiConf?

suppose we';ll soon see.