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Author Topic: RPM Gauge with Arduino Board  (Read 3536 times)

Offline cool hand

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Re: RPM Gauge with Arduino Board
« Reply #30 on: July 30, 2015, 06:51:51 AM »
Nice work cool hand! :thumbsup:

Interested to see how you interfaced the steppers to the real instruments.

Altimeter:
-you need to remove the pressure drums, then I drilled a hole on the back "wall", then I installed the stepper on the same axis and gear as the original motor (which is on the top right, not on the center axis. I tried to use the axis coming out on the center, unfortunately that one is geared such as a full turn is 10000. Where I went a full turn is a bit more than 1000ft but manageable. (an X27 stepper has about 1000 steps/turn).
-on the same axis i installed a photointerrupter for zero sensing at startup. After initial zero find, it's a matter of counting the steps. If it turns off when you are within 600 ft of zero, it auto resets to zero, if not, in the software i made a routine to reset it (you tell the program what altitude your reading and that's it.).
-on the back of the pressure setting gearage goes and encoder. I scavenged one from an old mousewheel since they're small enough. Tricky part is calbirate it so that a mechanical rotation of 1 digit corresponds to a pulse on the joystick (yes, my arduino is seen as a joystick).

Machmeter:
-sorry i dont have a better picture, it's not like that anymore (that was temporary hot glue in order to test the position of the motor).
Basically I wanted to attach myself on the original axes. There is one on the left and one on the right.
Problems:
1.they're not equally geared so its harder to make calculations
2. in this particular machmeter there was some damage so the original shafts weren't turning smoothly.
So I gutted most of it, but without cutting any metal, made a 3d printed bracket to hold the motor (x40 dual axis stepper), and used some creativity to connect the shafts to the wheel.

Offline Moon

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Re: RPM Gauge with Arduino Board
« Reply #31 on: July 30, 2015, 07:59:11 AM »
Thanks cool hand! :notes: Good to see modified X27 steppers have enough torque to drive real instruments.

Offline cool hand

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Re: RPM Gauge with Arduino Board
« Reply #32 on: July 30, 2015, 09:24:02 AM »
Thanks cool hand! :notes: Good to see modified X27 steppers have enough torque to drive real instruments.

Yes indeed.there's a but, you have to be careful in giving it proper acceleration.ie. Start slow and then ramp up.otherwise they will stall.I don't have the link in hand but search for gaugette library by Paul carpenter.in his blog he has a datasheet with suggested acceleration sequence

Offline mrwell

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Re: RPM Gauge with Arduino Board
« Reply #33 on: July 30, 2015, 11:26:09 AM »
Very valuable details, thank you!  :notes:
It would be nice if you decide to release your source code for Arduino and that modified library.
I'd not know what to do with them but others could help the rest in using it.

It is your work so it is your decision. No pressure at all. I understand if you decide to keep it for yourself.

Cheers!

Offline Rufus

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Re: RPM Gauge with Arduino Board
« Reply #34 on: July 30, 2015, 02:51:21 PM »
...thanks +1...well needed info... :notes: .
- Rufus