DIY Automatic Contactless Hand Sanitizer Dispenser

thingiverse

As new waves of Covid-19 spread continues, we decided to do something about it. Pooling all our talents together at RoboForce, we came up with this. Designed by our Techno Wizards, this hand sanitizer dispenser is easy to build, simple and reliable. The goal of this design is to ensure that it is simple enough for the anyone to build and maintain while providing a platform for advanced users to buildon. Basically, anyone with a 3D printer and access to simple materials can build it. STEP files are also included for any customization. Materials needed: 1x Small DC motor 1x TIP125 PNP transistor 1x IR proximity sensor 1x USB cable (Only the 5V and GND wire is used) 6x 693ZZ bearings 2x M3x25mm cap screw 3x M3x12mm button head screws 4x M3x6mm countersunk screws 1x 3D printed cover 1x 3D printed rotor 1x 3D printed pump body with integrated mounting 6mm OD 4mm ID silicone tubing (Length depend on your bottle height. Minimum 200mm) Assembly: 1. Stack 2 bearings and secure it to the rotor with button head screws. Repeat for all 3 sides. 2. Insert the silicone tubing into the pump body. 3. Push the silicone tube to the circular edge and insert the rotor. 4. Align and insert the motor shaft into the rotor. Do not push in all the way, leave a small gap between the rotor and pump body. 5, Secure the motor with cap screws. 6. Insert the IR proximity sensor into the slots and secure with countersunk screw. 7. Test the pump with water. It is self priming and can pump fluid even when the tube is full of air. 8. Secure the cover with countersunk screws. 9. Connect the transistor and the USB cable. 10. Get a PET soda bottle. Drill a 6mm hole on the cap. 11. Push the tube through and press fit the pump body on the bottle cap. 12. Adjust the sensitivity by turning the trimpot on the IR proximity sensor. 13. You're done.. Start sanitizing. 14. Show this thing to your friends.