Introduction: Linkit ONE Parking Sensor
Hey everyone, in this instructable, I will show you how to make a parking sensor that turns on an ultrabright LED when your car comes close enough to the wall. I am not liable if you drive your car into your house from the device being wired incorrectly.
Step 1: Parts and Tools
Here are the parts and tools that you will need to make this project:
HC-SR04 Ultrasonic sensor
4x white LEDs
Linkit ONE microcontroller
Small project enclosure
Soldering Iron and solder
Computer with the latest version of the Arduino IDE and linkit ONE drivers
Step 2: Drill Holes Into Project Enclosure
Place some painters tape onto a side of the project box, place the ultrasonic sensor onto it and trace over it. Now, use a 16mm drill bit to drill two holes for the sensor. On the perpendicular side, drill a 5mm hole for the LED.
Step 3: Wire LED
Wire the LED's "+" pin to pin 13 on the linkit ONE board. Then, wire the "-" pin to a ground pin on the linkit ONE.
Step 4: Wire Ultrasonic Sensor
Wire the ultrasonic sensor's "-" to GND, VCC to 5V, Trigger to pin 12, and echo to pin 11.
Step 5: Mount Sensor and LED to Box
Glue the Ultrasonic sensor to the drilled holes on the box, then the LED to the perpendicular side of the box
Step 6: Code
Download the attached code and upload it to the linkit ONE. You may want to change the distance variable depending on how far you want to park from the wall. I don't drive, so I don't know exactly how far in cm it should be parked. If you want to change it, just find the "if(distance < 150)" and change the "150" to whatever distance in cm seems appropriate.
Step 7: Mount Box to Wall
You can mount the project box in many ways, but I chose to use a small amount of duct tape so I wouldn't need to drill any holes into the wall. You will need to make sure that the sensor is low enough to detect the car.