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Automatic Hand Sanitizer Dispenser - DIY

In the view of covid-19 I've seen people making various kind of sanitizer dispensers. I thought I'd also give a try with what ever material I possess at the moment. As a result finally I prepared this sanitizer dispenser at a low cost and using most of the waste items. 

Automatic Sanitizer Dispenser
Picture : Prepared ASD 

So here I'm sharing step by step process to do the same. Atlast it's a DIY.  #Fight _Covid19

The circuit consist of following components. 
*Click on components name to purchase.

Step 1: Preparing a pump
The pump mainly consist of 4 parts.
  1. Impeller
  2. Discharge Nozzle
  3. Casing
  4. Motor
I took a syringe and made a impeller from it's inside core.



By the use of outside part of syringe made a casing. The discharge nozzle is done using the empty pen refill.

I'd a corelss dc motor which is 25000 RPM motor at a voltage of 3.7v. This is then connected with impeller.



By adding motor with impeller to the casing  I finally prepared a pump. Please note that there shouldn't be any air gap in the setup. Otherwise pump will not pump the sanitizer. So I've used m-seel to prevent air leakage.
So my pump is ready now.


Step 2 : Prepare a Sanitizer storage and connect pump to it
I had a Amul Kool bottle and this will be the liquid storage. I've connected the pump to bottle by making a hole to it.


Step 3 : Prepare stand and  connect componets to it
I've prepared a foam stand and added switch, liquid storage and battery holder to it. Finally it looks like this.


Step 4 : Pepare a circuit to run our pump
The circuit consist of following components. 
*Click on components name to purchase.
The PNP transistor will swich on the circuit when it will receive active low signal. The IR obstacle sensor which I have give active low on detecting object. So the circuit turn on when object is detected. So it'll serve our purpose. You can refer below circuit.



I've used 3 AA batteries to power up the circuit. Here the base of the transistor is connected to the 'OUT' pin of the IR sensor with a 1K Ohm resistor in series. The collector is connected to the motor. The emitter is connected to the positive terminal of the battery. The switch was installed next to the positive terminal of the battery which is not shown in the circuit diagram. 


To see video of this project click here : 


Known issues:
1. Can't be kept under sunlight. As the IR sensor is used, it is responsive for IR radidation. The Sun is the source for different verities of radiations including IR. So it will activate motor automatically.
Possible solution:
  •   Proper placement of IR sensor with enclosue, so that it won't recive any outside radiation.
  • Use capacitive proximity sensor instead of IR sensor.
2. The timer based dispense is not implemented. - Not yet implemented.


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