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Sentry water gun

This high tech water gun will track persons with the lidar sensor and fire several shots of water

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Engineering is not always about solving world problems. Engineering is also about having fun, this is especially important for getting younger people enthiasastic about technical education. In Europe it's becoming more and more dramatic to find the right skilled technical people, like for instance software developers. The European commision predicts huge shortages sofware engineers for the coming years. Therefore, let's start with the fun :)

This high tech water gun will track persons with the lidar sensor and fire several shots of water
The idea is to build something that's easy to replicate, therefore the project is constructed as much as possible with standard available components. So anyone interested can just get the parts and start replicating. The construction is made of 125mm PVC drainage pipes. Mainly 3D printer parts are used, like steppers, Minitronics V2.0, belts and axis. The only special parts used are the laser cutted plastics, but, all open source!

The drawing of the project was made in Sketchup. First I started with the basic construction:

The rotating parts will be guided by sanded pipes:

The water gun is able to pan and tilt, to do this there will be two NEMA17 steppers mounted inside. To rotate the gun, several bearings, axes, belts and so on are needed. These parts are mounted and held into position with some laser cutted plastics.

The first image is made out of 5mm thick pastic, the second is made out of 1mm plastic. the used bearings have 7mm thickness, so these are placed in the 5mm material, with two 1mm spacers at both sides.

The final result:

The big slots are meant for cables and water supply.

All glued parts drying:

SSEYO Koan Play File - 571.95 kB - 04/13/2019 at 12:22

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SSEYO Koan Play File - 615.79 kB - 04/13/2019 at 12:22

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SSEYO Koan Play File - 3.84 MB - 04/13/2019 at 12:22

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  • 2 × NEMA17 stepper 1.8degree/step
  • 2 × 60 timing belt pulley 6mm 2GT belt, 8mm axis
  • 3 × 125mm PVC drainage pipe T
  • 1 × 125mm PVC drainage pipe, 1m
  • 1 × 125 PVC drainage pipe coupling

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Marcel wrote 04/22/2019 at 18:56 point

For the lidar sensor I will use the RPLidar A1, I'm planning like to put this behind a glass/plastic panel..... but i'm wondering if this will work properly, any comments on this are more than welcome!

So the idea is to put it in a plastic pipe, like: https://www.pyrasied.nl/en/product/transparent-acrylic-tubes-gs/

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