park sensor idea is to show green when you have plenty of space to pull the car forward , turning yellow as you approach the fully forward position, and then red when you should stop.
the project using arduino Uno.
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Step 1: Component Need
1- Arduino uno
2- ultrasonic hc-sr04
4- 3 led
5- 3 540 ohm resistor
6- male-male wires
Step 2: Conncecting
1- trigger to A0 and echo to A1 in arduino
2- 540 ohm resistors are for the leds and they are connecting to the positive leg of the leds and then GPIO.
3- negative leg for the gnd
Step 3: Code
code sequence :
- if the distance greater than 25 enable the green led , else if it's in the range between 10 and 25 enable yellow led else if it less than 5 enable red led
github code link :