Stop data acquisition when data falls quickly/sharply from peak

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I am reading three channel: motion(Test), motionRaw(Labjack), pressure(LabJack). I want to acquire "pressure" when "motionRaw" falls between 0.2 and 1.2v.

I want to stop acquisition as soon as pressure value starts to drop rapidly. The following code I used for this purpose.

When x axis is 100 points, the difference of pressure[0] and pressure[1] is greater then 0.5. So, data acquisition should be stopped. But, in my case, it did not  stop. What did I do wrong?





if ((motionRaw[0] > 0.2) && (motionRaw[0] < 1.2)) && (pressure[0]- pressure[1] <0.5)&& (pressure[0]- pressure[1] >-0.5)



Please help


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