Automatic Hand Sanitizer Dispenser with COVID19
The Corona Virus, also known as Covid19, is wreaking havoc over the globe. The Corona Virus is currently affecting nearly every nation in the world. The World Health Organization (WHO) ha…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Automatic Hand Sanitizer Dispenser with COVID19 is a iot project. The Corona Virus, also known as Covid19, is wreaking havoc over the globe. The Corona Virus is currently affecting nearly every nation in the world. The World Health Organization (WHO) ha…
- Source pages
- 1389-1393
- Named parts
- 6
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
- Computer with a data-capable USB cable
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
ESP32 Dev Module
A programmable controller that reads inputs, makes decisions, and drives the project's outputs.
What it does hereIt is the control centre and must use the documented board, pin map, supply, and logic level.
Buy / compare this part ↗Advantages
- Reprogrammable and reusable
- Large learning ecosystem
- Complex behaviour remains changeable
Limitations
- GPIO voltage and current are limited
- Some pins affect boot or communication
- Loads normally need a driver
Handling
- Disconnect power before rewiring
- Avoid static discharge
- Never power motors, relays, or pumps directly from GPIO
Specifications to verify
- Use the exact model, value, package, and rating listed for ESP32 Dev Module; similar-looking parts are not always interchangeable.
- Confirm operating voltage, logic level, pinout, memory, USB interface, and maximum GPIO current.
What's this?Image, role, pros, cons, handling & specifications
Ultrasonic Sensor
A sensor converts a physical condition into an electrical signal the circuit can measure.
What it does hereIt provides project input as an analogue, digital, resistive, frequency, or calibrated signal.
Buy / compare this part ↗Advantages
- Adds real-world awareness
- Can usually be tested independently
- Often supports calibration
Limitations
- Readings can drift
- Placement affects results
- Some sensors need warm-up or calibration
Handling
- Protect the sensing surface
- Observe supply voltage and polarity
- Keep signal leads away from noisy power wiring
Specifications to verify
- Use the exact model, value, package, and rating listed for Ultrasonic Sensor; similar-looking parts are not always interchangeable.
- Confirm supply range, output type, measurement range, accuracy, response time, and pin order.
What's this?Image, role, pros, cons, handling & specifications
LCD Display
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for LCD Display; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
What's this?Image, role, pros, cons, handling & specifications
Relay Module
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for Relay Module; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
What's this?Image, role, pros, cons, handling & specifications
Mini DC Submersible Pump
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for Mini DC Submersible Pump; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
What's this?Image, role, pros, cons, handling & specifications
Hand Sanitizer
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Hand Sanitizer; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Automatic Hand Sanitizer Dispenser with COVID19: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 3 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteThe Corona Virus, also known as Covid19, is wreaking havoc over the globe. The Corona Virus is currently affecting nearly every nation in the world. The World Health Organization (WHO) has already declared that it is a pandemic disease. As a result, several cities are currently in lockdown situations, individuals are unable to leave their houses, and thousands of people have already passed away. Numerous websites, such as Microsoft's Tracker and Esri's Covid19 Tracker, among others, are currently offering real-time data on the number of coronavirus cases.
As part of this endeavor, we are going to create an Automatic Hand Sanitizer Dispenser that has an LCD display that also provides a real-time tally of Coronavirus cases. The ESP32, an Ultrasonic Sensor, a 16x2 LCD Module, a Water Pump, and a Hand Sanitizer will all be utilized in this project. To obtain real-time information on people infected with Covid19, we are relying on Esri's API Explorer. To determine whether or not there are hands covering the opening of the hand sanitizer machine, an ultrasonic sensor is utilized. It will continually calculate the distance between itself and the sanitizer outlet and will instruct the ESP to switch on the pump to push the sanitizer out once the distance is less than 15 centimeters. The ESP32 is a Wi-Fi module that can quickly and easily connect to the internet, and it is utilized as the primary controller. In the past, we made use of it to construct a variety of IoT-based projects utilizing ESP32.
Components Required
Project build noteESP32 Dev Module Ultrasonic Sensor 16*2 LCD Display Relay Module Mini DC Submersible Pump Hand Sanitizer
Circuit Diagram
Project build noteThis Covid19 Tracker and automatic hand sanitizer dispenser machine's full circuit diagram is shown below. Through the use of a relay module, the ESP32 can communicate with the water pump. The relay's Vcc and GND pins are linked to the Vin and GND pins of the ESP32, while the relay's input pin is attached to the D19 pin of the ESP32. The ultrasonic sensor's Trig and Echo pins are connected to the Arduino's D5 and D18 pins, respectively. Programming ESP32 for Covid19 Tracker
At the bottom of this page you can find the full source code for both the Auto Hand Sanitizer and the CORONA19 Tracker. Important aspects of the curriculum are broken down and discussed in this section. In the beginning of the code, include all of the necessary files from the library. In order to retrieve data from an HTTP server, the HTTPClient library is invoked. The data arrays are phrased with the help of the ArduinoJson library. In this scenario, the ArduinoJson library is utilized to filter the Confirmed cases and the Recovered data out of the data array that is being received from the server. In order to create the LCD display Module, the LiquidCrystal library was utilized. Testing the Automatic Hand Sanitizer with Covid19 Tracker Now, at long last, our hand sanitizer dispenser that is powered by a battery is prepared for testing. Simply connect the hardware according to the circuit diagram, and then upload the program into the ESP32.
At the beginning, you should see the message "Covid19 Tracker" and "Hand Sanitizer" on the LCD. After a few seconds, it will display confirmed cases and recovered cases in the LCD screen, as shown in the figure.
You built Automatic Hand Sanitizer Dispenser with COVID19.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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