okay, but my nano with connected with a ground on Rpi. Or do you mean a resistor?
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Some problems with homeduino
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@tpointandrew sorry, my bad. I took a look at my setup. I use a second powersource to power my RF receiver/transmitter and DHT. The data pins are connected to the nano, ground and VCC come from my powersource. Now there is a extra wire(ground) between the powersource and the ground of the nano (pin 4) Normally i would think the nano is powered by USB so it wouldn’t need some extra wiring, but without the ground i have a range about a 1/2 meter
my setup(http://i61.tinypic.com/2roi3pz.jpg)