Introduction: Air Conditioner Reminder
Remember to close the air conditioner before you go outdoor.
This device will put in front of the door when you get closer to the door, an LED light bulb will light up.
Step 1: Structure
connect the wires and program
Step 2: Set Up Light Sensor
You need to set up the light sensor to measure the distance is working or not.
Step 3: LCD Screen
Set up the LCD screen, it can tell you the distance when you put your hand in front of the light sensor.