Aluminum Built - Actobotics / Hall Sensors

[SC-Maik]

In researching I came across this: http://www.digikey.com/product-detail/en/6127V1A360L.5FS/987-1393-ND/2620662 for $15 each US. for that price... well it would save a lot of time building them from scratch... and they would be consistent verse an uncertain outcome that each custom built hall Effect Sensor could deviate from the other depending on the magnet placement.. etc. would give different readings.

What do you think? Are these good for what we need?

Here is the spec sheet on them: http://www.bitechnologies.com/pdfs/6120.pdf

I made some research about these sensors and all I could find was great comments about them. I don't know what zdayton has in mind, but I would love to give them a try.
Only kickback atm is that I have a 3.3V Pro Micro and hall sensors need 5V to work.

[jeruw]

Only kickback atm is that I have a 3.3V Pro Micro and hall sensors need 5V to work.

For what it's worth, I bought a couple of the generic 16Mhz/5v Pro Micro boards on Ebay for around $6 each shipped in the US. Might be worth picking up one or two if you can get them similarly priced. They work great for me.

I'm not as excited personally about a hall effect pot, but it would be an easier to implement solution. I have a few ratiometric sensors I'm going to play around with and also got a couple samples of angular encoders, but I'd need to fab some break out boards for those. I may give that a try in a few weeks. I'm not sure how well the ratiometric sensors will work. Certainly calibration could be an issue to deal with.

[Cybertraxs]

Those plans are looking fantastic!!!!

I'm wondering, instead of the 3/8 tubes, 1/4 shaft https://www.servocity.com/html/1_4__precision_shafting.html#.VTAs6PnF-So could be used? 1/4 Stainless Steel Shaft Coupler https://www.servocity.com/html/set_screw_shaft_couplers.html#.VTAsyfnF-Spcould connect the Potentiometers to the shaft? Costs would be cut down...

Thoughts?

[SC-Maik]

My original plan was the use of Allegro 1302 hall sensor. That lead me to hollow 3/8" tubing.
Let me explain.

3/8" Hollow Tubing = OD: 0.375" - ID: 0.300"

Diametrically magnetized ring magnet = OD: 0.500" - ID: 0.256"

3D printed ring (manget support) = OD: 0.500" - ID: 0.375"

Allegro 1302 = Width: ~ 0.157"






3D design coming soon

[SC-Maik]

I've found a better magnet

https://www.amazingmagnets.com/show-decimal-r250a1-dm.aspx



2" long 3/8" aluminum tubing -> 3D Printed magnet holder -> Magnet

[Cybertraxs]

That looks great SC-Maik!!!

Maybe use this to hold the sensor?

https://www.servocity.com/html/90o_single_angle_short_channel.html#.VTFvyfnF-So

[SC-Maik]

Check this out

ProtoBoard Round 1" & 1" Bore Tube Clamp A or even smaller clamp if I make another custom board

This setup solves a lot of alignment problems. I can even put clamp on "rail" holes for left-right movement and get closer/further positioning of sensor/ magnet.





By the way, I am thinking of printing magnet holders with Ninjaflex Semiflex.

[Cybertraxs]

Nice work!!!

I didn't get to finish my post because I had to run out... to local metal fabricators!!

Instead of 3 each 1/4 sheets, would one 1/2 sheet work for the bases? I need to send him files, and was hoping you could email me the files for the base and handle base with the screw locations. Let me know... Thanks!!!

Also... with the above post I was thinking of using:




https://www.servocity.com/html/actobotics_grommets.html

Then "potting" the chip into the grommet!!

What are you using to create the images?

[Cybertraxs]

Sc-Maik, I got this off of ebay yesterday and will have it by Monday April 20th.

2 PCS Pro Micro Atmega 32U4-MU 5V 16MHz Board Module For Arduino-Compatible
Product info: (Bolded the important PTU fuse to protect the motherboard!!!)

The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.
This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. There is a voltage regulator on board so it can accept voltage up to 12VDC. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC.
We've also added a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit.
Features:
ATmega32U4 running at 5V/16MHz
Supported under Arduino IDE v1.0.1
On-Board micro-USB connector for programming
4 x 10-bit ADC pins
12 x Digital I/Os (5 are PWM capable)
Rx and Tx Hardware Serial Connections

http://www.ebay.com/itm/221653448880?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[SC-Maik]

Patience my friend

Still "work in progress" so I don't have final designs. Once finalized everyone will get the drawings/stl files.

I was thinking of a 5mm height base (~0.2") so 1/2" sheet is quite large. One 1/4" sheet should be more than enough.
Chip needs a break out board to work so grommets won't work.

I am off to bed. 2:44am here...