Things used in this project

Hardware components:
51gzz5eu9pl. sx425
HC-SR04
×1
09264 1
RGB Diffused Common Anode
×1
11113 01
SparkFun Arduino Pro Mini 328 - 5V/16MHz
×1
Tens70
9V battery (generic)
×1
Software apps and online services:
8ztngd 9
circuito.io
Ide web
Arduino IDE

Custom parts and enclosures

Air Gate Body
Air Gate Base
Air Gate for drones

Code

Air gate void loopArduino
Replace the void loop () function in the sample code from circuito.io with the code below
void loop() {
  // Read distance measurment from UltraSonic sensor
  int hcsr04Dist = hcsr04.ping_cm();
  delay(10);
  //Serial.println(hcsr04Dist);

  rgbLed.setRGB(255, 0 , 0 );  //Change the values in the brackets to (255,0,0) for pure RED, (0,255,0) for pure GREEN and (0,0,255) for pure BLUE.


  if (hcsr04Dist < 30 && hcsr04Dist > 2)
  {
    rgbLed.setRGB(0, 255, 0);    //Change the values in the brackets to (255,0,0) for pure RED, (0,255,0) for pure GREEN and (0,0,255) for pure BLUE.
    delay(1000);
  }
}

Credits

Jzbvk4go5lw68vtvbfe4
circuito.io team

Circuito.io is an online platform that generates wiring and code for Arduino projects. Want to know more? Visit http://circuito.io

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