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Claw Machine V3, Arduino Compatible

I have built three working prototypes of my ATmega powered Claw Machine. The third iteration has cemented the design. I have started putting together kits and will be updating this page periodically. All I can say is there are a ton of parts and I am in over my head. The Claw machine is broken down into sectional kits.


There is no updated assembly manual/video for this machine as of yet. Meaning, you are buying these partial kits well knowing you're own your own. The claw machine build page might be of assitance. 


This item has gone back into R&D. See the build page for the latest news.

Basic Servo Claw,  V3

Includes my servo claw as seen on my Claw Machine V2 (same as V3). 

The claw is a clone of generic servo powered 'claws' or 'grabbers' you see online. I designed this from scratch when I became dissatisfied with the aforementioned claws on the market. Though my design is not perfect, it has proven very reliable in field testing of my claw machine.
Parts are laser cut from 0.25" maple plywood. You must provide #6 machine screws, lock nuts and washers (washers are optional). The opening will fit a standard 5V hobby servo (the cutout is 20x41mm). I hot glue the driven arm to one of the servo plates (whatever they are called). 

You must drill the holes to fit your servo. I found that servo mounting holes are non-standard so they are not cut on this design. You get wood parts only. Servo is not included, hardware is not included.


"What Motor fits in this?" Shown in my videos is a Hi-tec HS-422 servo motor. When supplying your servo motor, I would aim for that size/type.




Claw Machine Unipolar Stepper Motor Driver Board

The PCB I made for a claw machine application. There might be other and possibly better methods to drive these motors, like a DIY 3D printer driver PCB, but I want to make the machine from scratch, so here we are.

This board can drive [supply power] to four Unipolar Stepper motors independantly labled on the PCB as X, Y+, Y- and Z. Th PCB features the ability to drive 2 motors independantly and with the other motor pair (Y-,Y+) mirrod of eachother.  Just install 0.1" jumpers to duplicated the signals to motors Y- and Y+, which is what I do with my claw machine.

This board also has two extra TIP120 spots to control power to:

A) Servo Motor and 

B) turn LED's 


I laid this PCB out to have a separate Vcc for every stepper motor. You can drive all the steppers at the same voltage, or mix and match.  Meaning; the Vcc's are isolated/independant from eachother. The power traces are pretty fat, I think I spec'd it to match the max current of the TIP120's. I mean, that would be smart right?


You are buying the bare PCB.

To populate this PCB and use for the intended application of a claw machine you will need to supply the following thru-hole components:

  • 18 TIP120s
  • 18 ~2.2k resistors
  • 14 (2-set) Screw Terminal Headers, 5mm pitch
  • ~30 Male headers 0.1" pitch
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