Build an APDS-9960 Gesture Control Demo

// ESP32 APDS-9960 directional gesture demo
// Detects directional hand swipes; this is not AI gesture recognition.
#include <Wire.h>
#include <SparkFun_APDS9960.h>

SparkFun_APDS9960 apds;

const int INT_PIN = 4;
const int LED_UP = 25;
const int LED_DOWN = 26;
const int LED_LEFT = 27;
const int LED_RIGHT = 14;

volatile bool gestureFlag = false;

void IRAM_ATTR onGesture() {
  gestureFlag = true;
}

void clearLeds() {
  digitalWrite(LED_UP, LOW);
  digitalWrite(LED_DOWN, LOW);
  digitalWrite(LED_LEFT, LOW);
  digitalWrite(LED_RIGHT, LOW);
}

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);

  pinMode(INT_PIN, INPUT_PULLUP);
  pinMode(LED_UP, OUTPUT);
  pinMode(LED_DOWN, OUTPUT);
  pinMode(LED_LEFT, OUTPUT);
  pinMode(LED_RIGHT, OUTPUT);
  clearLeds();

  if (!apds.init()) {
    Serial.println("APDS-9960 not found. Check 3.3 V, SDA GPIO21, and SCL GPIO22.");
    while (true) delay(10);
  }
  if (!apds.enableGestureSensor(true)) {
    Serial.println("Gesture sensor did not enable.");
    while (true) delay(10);
  }

  attachInterrupt(digitalPinToInterrupt(INT_PIN), onGesture, FALLING);
  Serial.println("APDS-9960 gesture demo ready. Swipe above the sensor.");
}

void loop() {
  if (!gestureFlag) return;
  gestureFlag = false;

  if (!apds.isGestureAvailable()) return;
  int gesture = apds.readGesture();
  clearLeds();

  switch (gesture) {
    case DIR_UP:
      digitalWrite(LED_UP, HIGH);
      Serial.println("UP");
      break;
    case DIR_DOWN:
      digitalWrite(LED_DOWN, HIGH);
      Serial.println("DOWN");
      break;
    case DIR_LEFT:
      digitalWrite(LED_LEFT, HIGH);
      Serial.println("LEFT");
      break;
    case DIR_RIGHT:
      digitalWrite(LED_RIGHT, HIGH);
      Serial.println("RIGHT");
      break;
    default:
      Serial.println("Gesture not classified.");
      break;
  }
}