Published May 11, 2020 © GPL3+

Arduino Soap/Sanitizer Dispenser (overkill version)

Basically an overkill soap dispenser made from CNC linear rail

BeginnerFull instructions provided8 hours4,214

Most Practical - US Based Project

2020 China-US Young Maker Competition

Things used in this project

Hardware components

SparkFun Stepper motor driver board A4988

nema 17 stepper motor

12V lithium ion battery pack

SparkFun Ultrasonic Sensor - HC-SR04

UTSOURCE Electronic Parts

everything above can be found here for a low price

Arduino UNO

JLCPCB Customized PCB

Software apps and online services

Autodesk Fusion

Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)

Story

watch the video first

so the goal here was to build a Soap/Sanitiser without using the "servo motor method" instead go with another approach.

this is actually pretty straightforward built,

first, you need to print these parts and gather all the electronics components that we need.

Thanks UTSOURCE.net to offer electronic components for this project!

you can check UTSOURCE.net, they deal in all kinds of electronics components like for example ultrasonic sensor which I'm using in this project and many more.

Parts that you need to 3D print for CNC rail -

1. END x1

2. Motor End x1

for rest of the built

3. Upper x1

4. LOWER x1

5. Lid x1

6. backbone bracket x1

7. Front support x1

8. back support x1

9. base x1 (or just use any plywood as the base)

for the CNC rail built instruction, watch this video

(I've just changed the carriage of the linear rail with a different one which has two holes on it for attaching the lever )

also, you might need to make a custom soap bottle holder as these bottles are not really universal.

also, this is not really a LOW-COST sanitizer dispenser and is hard to remake if you don't have a 3D printer, so here's an alternative which I've been working on recently.

https://www.hackster.io/Oniichan_is_ded/yet-another-solenoid-valve-based-sanitizer-dispenser-ecec7a

Schematics

Code

code

int trigPin = 11; 
int echoPin = 10; 

const int stepPin = 13; 
const int dirPin = 12; 

void setup()
{  
pinMode(trigPin, OUTPUT); //Sensor
pinMode(echoPin, INPUT); //Sensor  
pinMode(stepPin,OUTPUT); // Step
pinMode(dirPin,OUTPUT); // Dir
Serial.begin(9600);
} 

void loop(){
  

long duration, distance;
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(5);
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 distance = (duration/2) / 29.1;
 Serial.print ("cm ");
 Serial.print (distance);



if (distance < 30)
{
digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction
  // Makes 300 pulses for making one full cycle rotation
  for(int x = 0; x < 250; x++) {
    digitalWrite(stepPin,HIGH); 
    delayMicroseconds(600); 
    digitalWrite(stepPin,LOW); 
    delayMicroseconds(600); 
  }
delay(1000); // One second delay
  
  digitalWrite(dirPin,LOW); //Changes the rotations direction
  // Makes 300 pulses for making two full cycle rotation
  for(int x = 0; x < 250; x++) {
    digitalWrite(stepPin,HIGH);
    delayMicroseconds(600);
    digitalWrite(stepPin,LOW);
    delayMicroseconds(600);
  }
}
}