ceramic and tantalum capacitors

[totalis]

Having ordered the parts for the $50 robot, i find i have ordered .1 uf tantalum caps instead of ceramic,
this is to go between the AVCC and GND,

will it matter?

i know tantalum are polarized, which way round should it be?

Thanks all

T

[Soeren]

Hi,

[...] i have ordered .1 uf tantalum caps instead of ceramic, this is to go between the AVCC and GND,

will it matter?

Not for the first while at least, but if it behaves strange after having run OK for a while, replace them (with ceramics).

i know tantalum are polarized, which way round should it be?

It might have a black line (or barre) near the negative lead. If not, the writing should be near the positive side.
If you have a link to a picture, it will be easier to say.

Positive goes to Vcc (which if it's a microcontroller really should be Vdd).