In the wiki page about the flow sensor (seeedstudio.com/wiki/G3/4_Water_Flow_sensor) it says that a 10k pull-up resister is needed on the signal wire. Is this really correct? I’m looking at my flow sensor right now with my scope and with no pullup whatsoever the signal wire is already high and pulls down for pulses. And it works great with my arduino with no pull-up resister and without using the internal pull-up resister in arduino.
Am I correct? Is the wiki wrong?
Also the breadboard picture of how to hook up the flow meter is wrong; if you hooked it up that way you’d short the +5v and the yellow wire of the flow meter sensor itself, connect the ground to the red wire, and leave the black wire with no connection. A simple mistake in rendering of the diagram. On a breadboard the rows are connected, not the columns! But if a newbie attempted to use this diagram exactly as presented, they just wouldn’t get anything!