Comparing two input voltages?

Question

Philip Harris 2018-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435650-comparing-two-input-voltages

编辑： Adam Danz 2018-12-14

I'm attempting to build a ride by wire system, I've built a proof of concept in Simulink utilising an Arduino as the controller.

Now I've moved on to real hardware with a RBW throttle, it uses two hall effect sensors to give two voltages. On one it gives a range of 0.9 - 4.4v and the other is 0.4 - 2.2v. I've looked through various blocks but I'm struggling to see a way forward and would appreciate any guidance on this problem.

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Philip Harris 2018-12-14

Implementing the code.

It's almost like a verification. On other throttles the relationship is 0 - 5v and 5 - 0v as you require one signal to verify the other otherwise if it falls out of sync you need to flag an error code as riding the vehicle would become dangerous.

So on mine if signal 1 is 3v then signal 2 should be ~1.5v before then passing signal 1 forwards to operate a servo.

Adam Danz 2018-12-14

I continued in the answers section now that we're getting closer to understanding the problem. If I'm still off base, I can remove that answer and we can continue here.

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Answer 1

Adam Danz 2018-12-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435650-comparing-two-input-voltages#answer_352382

编辑：Adam Danz 2018-12-14

在 MATLAB Online 中打开

"if signal 1 is 3v then signal 2 should be ~1.5v before then passing signal 1 forwards to operate a servo."

If signal 1 is an instantaneous value s1 and signal 2 is an instantaneous value s2, would this work?

s1 = 3.012;       %3v + some noise
s2 = 1.490;       %1.5v + some noise
tol = 0.05;       %Noise tolerance; so s1/s2 must be +/- tol from 2
if abs((s1/s2) - 2) > tol          %Test that s2 is 1/2 of s1 within tolerance
    %[enter code to stop servo]    %system fail
else
    %[pass signal to servo]        %your system is working
end