DC motor rpm monitor & control using Pi Pico and Labview

RE: DC motor rpm monitor & control using Pi Pico and Labview

DAB — Sat, 04 Nov 2023 18:08:04 GMT

Very nice update.

RE: DC motor rpm monitor & control using Pi Pico and Labview

cbohra00627 — Fri, 03 Nov 2023 17:26:06 GMT

[mention:169a4014e923440aab0fa7af5203dabd:e9ed411860ed4f2ba0265705b8793d05] , we can understand it with the help of a fifo. When a value is inserted from the back, one value pops out from the front. Consider a shift register with 3 elements. In the first loop iteration, the first element will get the value. In the second iteration this value will pass to the second element and the first element will get some new value. This will continue for other elements also.

Actually, I was using a different motor (a small cpu fan) earlier which had 7 blades (7 slots). So, I had to multiply the time_diff by 7 to get time for one complete revolution. But then it stopped working, so I had to use another motor and make a flywheel with a slot. Since, there is only one slot now, I am multiplying by 1 only to get time for 1 revolution.

Thanks!

RE: DC motor rpm monitor & control using Pi Pico and Labview

Andrew J — Fri, 03 Nov 2023 15:31:45 GMT

Wow this is some change, well done! Teach me something now: how is that shift-register averaging working? You are passing one value out (time difference) and it is looping back into 10 values??? That's not something I've seen before so I'd like to know more.

Also, after doing the div by 10, you are only multiplying by 1 in the last VI image instead of 7, why is that?

It's a nice project and it's great that you persevered with it.