DIY Automatic Alcohol Dispenser
You can project are going to build the simplest motion activated alcohol and soap dispenser. From Italy this evening. It just gets worse. The death toll now worse than China 427 deaths in just the past 24 hours weeks after quarantine it’s really cool to find some kids using Arduinos to build a hands free alcohol dispenser. Eventually, a friend of mine from Facebook through Martin Miranda built a much more refined version of the Arduino project, and then took on the challenge to build a low cost version without using an Arduino for this project, you’ll be needing a DC water pump which you can buy online for just, less than $2. You’ll also need some aquarium tubing.
In my case I still had some medical tubes from a previous project for the electronics you’ll need the proximity sensor module which you can buy for $1, a tip 32 cpnp transistor, a one kilo ohm resistor, some wires and an extra USB cable, yes the cheap cables that come with your power bank for free for the container I recycle the glass jars that used to contain coffee to give your project a cleaner look you might want to feel that label to use a cloth and a few drops of pure acetone or hand wash alcohol to rub it off.
You only need a short segment of tubing to cut it off using your scissors, then you’ll have to stretch and force fit the other end of the tube to your water pump to prevent the shoe from slipping off, use a zip tie to fastenyour hand drill and drill a hole for your wire in your tubing.Insert the other end of the tubing to the cap.Same goes to your pumps wire. And now your pump is ready to prevent your tube from sagging, you might want to insert the bendable wire inside that tube, you could use some copper wire or some chicken wires. This way you can adjust the precision of your nozzle. Use your hot glue gun to mount passivity sensor in place with a few drops of superglue you can mount your transistor on your containers lid, it’s very unlikely.
Heat up in the setup. Here’s a simplified diagram for the wire. Start by soldering the one kilo ohm resistor across the transistors base to the proximity sensors digital output transistors emitter to the VCC 10 of the sensor, then solder the negative wire of your pump to the ground of your sensor for delivering power to the project and resurfacing an old USB cable, you can do that by cutting the other end of the cable and stripping the red and the black wires the red wire of the USB cable goes to the VCC 10 and the black wire goes through the ground pin of the sensor. Once you’re confident with your circuit, you can cover it with a blob of hot glue to prevent it from shorts or getting in the long run.
This project can also dispense viscous liquids like soap, but I built this project specifically for dispensing isotropic alcohol to reduce the project’s cost and complexity, I decided to get power from a USB power source, you can plug this project on a USB charger, or if you want to make it portable, a power back and supply power to it for weeks after connecting it to a power source, the power indicator should light up the other LED on the other hand indicates if an object has been detected the proximity sensor comes with the screw adjustment knob for adjusting the threshold distance for detection to limit the flow of liquid savage tip. Try it out and use it as a nozzle for dispensers output. That’s how you build the simplest automated alcohol dispenser without using an Arduino.