Touchless Dog Hand Wash Timer (Made in Fusion 360)
Introduction: Touchless Dog Hand Wash Timer (Made in Fusion 360)
COVID-19 makes us devastated, especially we should consider making our living cleaner and more sanitized than before. CDC always recommends us to wash our hand regularly and properly that can save our lives. The CDC guideline for good washing hands is that we should scrub our hands for about 20 seconds. For more information from the CDC guideline, click here. There are so many projects out there regarding touchless simple machines to help us combat this pandemic. In this challenge, I want to present a touchless hand wash timer combining with lights, music, and a creative enclosure that made my family and me delighted to use it.
This project is so simple to make and use. When we wave our hand in front of the ultrasonic sensor, it will turn on the light, start from green, and end with red. Moreover, to make this hand wash timer more interesting and fascinating is that I add a jingle that will sing to you for about 20 seconds in accordance with the CDC guideline. Actually, CDC recommends using Happy Birthday jingle for scrubbing our hands. We can change the jingles with any music as we desired and program it, so it will have a 20-second duration of jingles. Since my favorite animal is sheep, I used "Baa Baa Black Sheep" jingles for my hand wash timer.
This fall I am an 8th grader, who studies online schooling. You can find my enclosure design in Thingiverse and myminifactory. For the code, you can find in my blog.
Supplies
Materials and tools that we need for this project:
Arduino Nano
Ultrasonic sensor
6 LEDs (1 green, 2 whites, 1 yellow, 1 blue, and 1 red LED)
Speaker (you can use whatever speaker you have or Piezzo buzzer. I used a speaker from my old and unused headset)
Battery holder (for 3 AAA Batteries with built-in switch)
3 AAA Batteries
Small Perf board (2 x 8 cm)
Large Breadboard and jumper wire male to male (for prototype)
3D Printer and slicer
PLA Filament (Green and red)
Foam for the speaker (actually you do not have to do this. My speaker's foam was torn out when I do some trimming in speaker, so I add another foam to cover the speaker)
Electrical Wires
Electrical tape
Solder wire
Hot glue
Phillips Oval Head Tapping Screws (4 pcs)
Spray Paints (Green and red)
Sandpapers
Soldering gun
Desoldering pump
Makita Drill
Drill Bits
Philips screwdriver
Plier
Dremel Sander
Iron Hacksaw
Vise jaws
Double tape
Step 1: Wiring and Schematic
This is the whole idea for this project. 742
We will connect Arduino Nano with an ultrasonic sensor, speaker, LEDs, and battery holder. The ultrasonic sensor has 4 legs in it. Connect Trig to D12 pin Arduino Nano. Echo leg is connected to D11pin Arduino Nano. VCC connects to 5V Arduino Nano. Gnd connects to the Ground pin in Arduino Nano. Then, connect the positive leg of the LED with Arduino Nano. Here are the breakdowns of the connecting wire:
Green LED connects to D7 pin Arduino Nano.
White LED1 connects to D6 pin Arduino Nano.
White LED2 connects to D5 pin Arduino Nano.
Yellow LED connects to D4 pin Arduino Nano.
Blue LED connects to D3 pin Arduino Nano.
Red LED connects to D2 pin Arduino Nano.
Connect the negative leg of LED to the ground pin in Arduino Nano. Wiring the speaker with a red wire as positive and black wire as negative. The positive wire of the speaker is connected to D8 pin Arduino Nano and the negative wire is connected to the Ground pin in Arduino Nano. Lastly, connect the components with a power source. Here, I used 3 AAA Battery with the battery holder and built-in switch. Connect the positive to Vin in Arduino Nano and negative to ground in Arduino Nano.
For your information, there are two pins of ground in Arduino Nano. You can use ground pin in digital and analog either way.
Here is the image of schematic for the project that I made in Fritzing.
Step 2: Understanding Code
Of course you will need some codes to make this project work. For viewing the code, you could download the code in my Blog. But you should download the pitch library as well.
First, we should define the echo and trig pins in Arduino Nano. 939