DO IT YOURSELF| SIMPLE AUTOMATIC ALCOHOL DISPENSER without using arduino

DO IT YOURSELF

SIMPLE AUTOMATED ALCOHOL DISPENSER without using Arduino.

In this article we are going to build the simplest motion-activated alcohol and soap dispenser.

Weeks after quarantine it is really cool to find some kids using Arduino to build hand free alcohol dispenser. Eventually, I found much cool to build a much more refined version of the Arduino project. I then took on the challenge to build a low cost version without using Arduino.

For this project you will need.

       1. A DC water pump which you can buy online for just less than two dollar.

      2. Aquarium tubing you may also have some medical tubes.

For Electronics you will need

      3. A proximity sensor module you can buy it for a dollar

      4. TIP32 PNP Transistor you can buy it also for less than a dollar

      5. A 1-kilo ohm resistor

      6. Some wires and an extra USB cable you can use the cheap cables that come with your power bank.

Other material

      7. A container you can recycle the glass jar that used to contain coffee or tea without forgetting to use a cloth and a few drops of pure acetone or hand wash alcohol to rub it off.

PROCEDURES.

1. You will only need a shot segment of tubing so cut it off using scissors then you will have to stretch and force-fit the other hand of the tube to your water pump to prevent from slipping off use a zip tie to fasten it in place.

2. Have hand drill and drill a hole for your wire and your tubing

3. Insert the other end of the tubing through the cap same goes to your pump wire and now your pump is ready.

4. To prevent your tube from sagging you might want to insert the bendable wire inside that shoe you can use some copper wire or other wire. This way you can adjust the position of your nozzle.

5. Use your hot glue gun to mount the proximity sensor in place.

6. With the help of superglue, you can mount your transistor on containers lid.

                                             SIMPLIFIED DIAGRAM FOR THE WIRING

7. Start by soldering the 1kilo ohm resistor across the transistor’s base to the proximity sensor digital output.

8. Then the transistor's emitter to the VCC pin of the sensor.

9. Then solder the negative wire of your pump to the ground pin of your sensor.

10. For delivering power to the project and repurposing an old USB cable you can do that by cutting the other hand of the cable and stripping the red and black wires.

11. The red wire of the USB cable goes to the VCC pin and the black wire goes to the ground pin of the sensor.

Once you are confident with your circuit you can cover it with a blob of hot glue to prevent it from short circuiting in the long run.

This project can also dispense the viscous liquids like soap but I build this project specifically dispensing isopropyl alcohol.

To reduce the project 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 bank can supply power to it for weeks. After connecting it to the power source indicator should light up.

The other LED on the other hand indicates if an object has been detected.

The proximity sensor comes with a screw adjustment knob for adjusting the threshold distance for detection.

 And simply that is how you build the simplest automated alcohol dispenser without using arduino.

Keep your hand clean by filling it with liquid soap hand sanitizer or with rubbing alcohol. By reducing physical contact an automated dispenser keeps the virus from spreading around in communal areas.

 Mr. Nabhan