fischertechnik community forum

Two-way selector modules with servo.
The dimensions fit Fischertechnik. The servo setup is made in such a way that it cannot get stuck with a powerup. Sometimes this small servo goes out of position when applying the power supply voltage. There is extra space here. The flipper arm can easily be placed in 3 positions. This way you can select left, right or stop. The previously made optical detector also fits directly on this module. This way you can count the number of marbles.
The control is done via I2C. In my I2C with FPGA I have 32 servo outputs. The TXT-Controller controls the position via the I2C connection.

Thingiverse filles:
https://www.thingiverse.com/thing:4031194

Photo: parts with .stl files:



HD picture:
https://www.flickr.com/photos/fotoopa_hs/49188059691

Setup with 6 servo selectors and 2 additional IR detectors:


HD picture:
https://www.flickr.com/photos/fotoopa_hs/49188059721


Frans.

Hello Frans,
What a nice Idea again. I was just considering to drive a fischertechnik track switch with a Servo, but this seens an even better solution.

Thanks
Peter

Thank you, Peter.
You can use the original screws that come with the small servos. This setup is quite simple and stable. With the extra detector in front you get even more control and counting possibilities.
I use selective supports for 3D printing. In the two small holes at the bottom you may not allow any supports because otherwise those holes would be completely gone. The rectangular cutout for the servo must have supports. The other settings are just the default settings of the Flashforge Finder printer. I always print at 210 ° with 15% fill. The PLA used is the Polymaker polymax 1.7mm filament. Is more expensive but super quality and is very strong (stronger than ABS).

I am now working on another module, a feeder to feed the marbles piece by piece. It will also be with a small servo and fit on the FT blocks as a small stable module.
More about this later.

Frans