FootMouse With a Trackpad V1.0
by javierde22 in Circuits > Computers
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FootMouse With a Trackpad V1.0
Given the problems I have found in being able to use the mouse with my foot, I have decided to make a design that is printable so that it can be reproduced and used by anyone who has this need.
contacto on https://www.occitans.com/foot_mouse/
Supplies
Resources
Most components can be printed but some must be obtained via the web. These are the following links.
1 Logitech ERGO M575 Trackball mouse, which we will use as a base.
https://www.amazon.es/dp/B07W4DHQJ9?psc=1&ref=ppx_yo2ov_dt_b_product_details
1 Rubber ball. This is one of the most important parts of the design, it is very important that the diameter must be 29mm (or 30mm) and the type of rubber must be the hardness that this manufacturer supplies. At the time the project started they were all one color. Take the option of two colors that are separated by the middle of the ball. https://www.amazon.es/gp/product/B0BXLHP1FX/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&th=1
Colored beads. Tt is also very important that they are of the same size and hardness, otherwise the trackball system will not work. 6x9mm with a 4mm hole.
https://www.amazon.es/gp/product/B0CJLMFYKY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
6 switches with 7x7mm spring (without lock)
3 Bearing balls of 10mm diameter (it is very important that they are of this diameter)
https://www.amazon.es/dp/B0BPSQ25KG?psc=1&ref=ppx_yo2ov_dt_b_product_details
4 M5x80mm countersunk screws. Since it was difficult for me to get the link attached.
https://www.amazon.es/dp/B07B2YV1H1?psc=1&ref=ppx_yo2ov_dt_b_product_details
6 countersunk stainless steel screws M5x30
2 M5x20mm allen head screws
4 M5x30mm Allen head screws
1 screw with allen head M5x60mm
1 screw with allen head M4x60mm
1 screw with allen head M4x50mm
7 screws with Allen head M4x30mm
1 screw with allen head M3x50mm
1 screw with allen head M3x30mm
1 screw with allen head M3x40mm
1 screw with allen head M3x45mm or M3x50mm
12 stainless steel washers for M5 screw
13 self-locking M5 stainless steel nuts
9 M4 self-locking stainless steel nuts
2 stainless steel washers for M3 screw.
4 M3 self-locking stainless steel nuts
At the end of the document I attach some alternative links.
Print all parts
The plastic I used for this design is black PETG from SUNLU, although it probably works just as well with other types of plastics.
I recommend using it at 218 degrees.
I attach the configuration that I use with the ultimaker Method X printer and with Ender 3 pro (using 0.6mm nozzles)
I am attaching the necessary documents to print all the parts, and some extras that are not necessary in principle but in case we want to modify the design so that it fits better.
Model assembly
Since the printing plastic does not have very good behavior against friction, the “beads” have been added at various points in the model.
The most critical point is the rubber ball that pulls the trackpad.
Here it is very important that the hole where the bead and the bearing are inserted is very well printed and there is no point that rubs with the bearing ball. The hole where the boma ball goes is also very important to be very smooth. If necessary, use very fine sandpaper. The three bearing balls must come out the same and must rotate smoothly by hand, otherwise the rubber ball will not work in the mechanism.
To ensure the adjustment of the ball to the system, a distance has been added that is optional at the top.
The objective is for the rubber ball to roll correctly supported by the 3 bearing balls and protrude as little as possible from the assembly.
Beads also need to be added to the moving areas of the fingers so that they don't wear out so easily.
We must assemble the set with the following arrangement
When assembling and disassembling the mouse electronics, we must be careful when disassembling the electronic connection straps. For the control board connectors, we must first pull the black part of the connector and when the connector is up, remove the strap. To assemble it, it will be done in the reverse direction. When placing the straps, keep in mind that the copper part goes on the white part of the connector, as seen in the photo.
You have to be careful not to fray the tips (as shown in the photo) and make this connection as few times as possible since they are very delicate.
With the ball connector, we will have to pull the white tab up, and then we can remove the connecting strap. In this case the copper part should go towards the black part (bottom) as seen in the photo. To place the strap you have to do the reverse procedure. You have to be very careful when putting it inside so that it doesn't fray and check that it has gone all the way in.
