thanks again all for your help,
im trying to design an underwater vehicle with zero experience in arduino.. so it's going to be tough.
in regards to the atomic IMU being 3.3v, does that simply mean to power it, i have to bring the voltage down to 3.3v?
Or does it mean aswell as that, i have to boost the output through the Tx port as that is also 3.3v compared to ardunio's 5v HIGH?
sorry if that doesn't make sense, i'm just not sure if the Tx outputs as voltages etc, as i've never touched the Tx,Rx ports in my UNO obviously as i've found out it doesn't have them.
thanks.