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November 7, 2014 06:14
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Running the HC-SR04 with A Single Pin Using NewPing
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| // --------------------------------------------------------------------------- | |
| // NewPing library sketch that interfaces with all but the SRF06 sensor using | |
| // only one Arduino pin. You can also interface with the SRF06 using one pin | |
| // if you install a 0.1uf capacitor on the trigger and echo pins of the sensor | |
| // then tie the trigger pin to the Arduino pin (doesn't work with Teensy). | |
| // --------------------------------------------------------------------------- | |
| #include <NewPing.h> | |
| #define PING_PIN 12 // Arduino pin tied to both trigger and echo pins on the ultrasonic sensor. | |
| #define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm. | |
| NewPing sonar(PING_PIN, PING_PIN, MAX_DISTANCE); // NewPing setup of pin and maximum distance. | |
| void setup() { | |
| Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results. | |
| } | |
| void loop() { | |
| delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings. | |
| unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS). | |
| Serial.print("Ping: "); | |
| Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance and print result (0 = outside set distance range, no ping echo) | |
| Serial.println("cm"); | |
| } |
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