A portable radar system using an HC-SR04 ultrasonic sensor and servo motor to detect nearby obstacles within an 8 cm range. The device scans 15°–165° in real-time, triggering an LED and buzzer alarm ...
#define SONAR_NUM 3 // Number of sensors. #define MAX_DISTANCE 200 // Maximum distance (in cm) to ping. NewPing sonar[SONAR_NUM] = { // Sensor object array. NewPing(4, 5, MAX_DISTANCE), // Each sensor ...
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