Data cable max. length


I want to Position my bluetoothmodul, a little bit far away from the Ardoino Pro Mini. Cause I need also Connection from my roof garden.

For that there need to be a cable over about 7m with +/-/RX/TX. The Voltage drop isn't a Problem, but I thought the RX and TX cable maybe reduce the Speed (that woudnt be a problem for me) or even cut the communication( that woud be a Problem).

Are there People who already tried it? Which cable shoud be better for data: a thick one or thin ?

I hope you can understand me. :/

Try adding any cable with the necessary number of conductors of the new length to your present system and see if it works. Lower the baud value if needed. Here is a data sheet that will help.