[tingo]

Hello,

My first post here.
I've got a speeduino board v0.4.3c up and running and connected to TunerStudio with a generic base tune loaded. Iäve set engine contants and trigger characteristics. As input stimuli I have a 36-1 trigger wheel on a dc motor. Using a Denso Hall sensor. JP4 (pull up resistor) is on and JP2 set to Hall sensor.
Though this, I'm getting very strange RPMs shown in TunderStudio.
I have connected an oscilloscope which shows a decent square pattern. If I run the trigger wheel in 2000RPM then TunerStudio shows like 56RPM. The value in TS doesn't flutter. Very stable and goes and up steadily (but still way too low) when increasing the RPM on DC motor with trigger wheel.

In the inserted pics on my oscilloscope the yellow curve is measured on outgoing signal from hall sensor and the blue curve is measured on the speeduino board on the connecting pin to the Arduino board.
Both shows the signal going low periodically. What bothers me is that on the combined plot the seems to be quite much noise
When signals is going to 0v you still see some signal at 5 volt. Otherwise I don't see anything super strange with these curves. Or am I completely wrong with the graphs? Have I missed out something fundamental ?
Any ideas of what to look at more ?

[PSIG]

Please remove JP4 and post an image if it is different. Or, disconnect the sensor signal wire and post a 'scope image of the raw sensor output. Be sure to ground the scope probe on a PCB ground terminal.

[tingo]

Thanks for your input PSIG.
After reading your comment I went in to the garage and started to fiddle with my setup. By coincidence I rotated the hall sensor 90 degrees anti-clockwise and there, it worked! Now I have a steady correct RPM presentation in tunderstudio.
I thought I had tried that several times before but obviously not with this setup.
I can try to take a picture of the oscilloscope today with correct waveform and post here.
Sorry for bothering with such a easy-to-fix problem.

[PSIG]

NP It's always little things. The trick is finding the little things.