Hand Washing Reminder

Hey guys! Today I want to talk about my new machine- Hand washing reminder. Now, the coronavirus is spread all over the world. The government always publicize wash your hand after you went back to your home. So, I have an idea. I make a reminder machine to remind me to use alcohol when I come back. If in 30 seconds I didn't use the alcohol. The speaker will start to scream.

Step 1: Prepare Your Material

• Arduino UNO
• Ultrasonic distance sensor
• Photoresistor
• speaker
• wires
• 5mm LED
• 330-ohm resistor
• 10k ohm resistor
• Cardboard
• type

Step 2: Make Your Circuits

This image is the circuit. Make sure that each wire is connected correctly with others. The most important part is the circuits have two different resistors. One is 330 ohm, the other one is 10k. Also, the speaker has two different wires. Then, the wire that connected with LED is put into D-pin. You can change the D-pin you want.

Step 3: Coding!!

Code link: https://create.arduino.cc/editor/doctor9483/68b524...

Step 4: Make a Box and Put Your Arduino UNO Into the Box

You can make a box to cover your Arduino UNO. You can skip this step if you don't want to make a box.

Step 5: Connect With Your Computer. Congratulations, You Finish!

Let your circuit connect with your computer. Congratulations, you finish！