slipstick:
Can you draw a diagram of your working setup? I don't understand what you mean by "a pull up resistor parallel to the data line.Steve
The anemometer TX line is hooked up to Arduino's digital input pin. Pull up resistor is just hooked to the same pin, but another end of it is connected to +5V. Just like here Pull-up Resistors - SparkFun Learn
I used 2k2 and 10k pull up resistors, and they both work just fine. I know, my question if kinda paradoxic, why does this work? The anemometer clearly pulls data pin high, when it's transmitting! Weird!