Arduino uno User Manual

Figure 15—PING))) basic circuit
digitalWrite(PING_SENSOR_IO_PIN, LOW);
15
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pinMode(PING_SENSOR_IO_PIN, INPUT);
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const unsigned long duration = pulseIn(PING_SENSOR_IO_PIN, HIGH);
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if (duration == 0) {
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Serial.println("Warning: We did not get a pulse from sensor.");
20
} else {
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Serial.print("Distance to nearest object: ");
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Serial.print(microseconds_to_cm(duration));
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Serial.println(" cm");
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}
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delay(100);
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}
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unsigned long microseconds_to_cm(const unsigned long microseconds) {
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return microseconds / 29 / 2;
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}
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First we define a constant for the IO pin the PING))) sensor is connected to.
If you want to connect your sensor to another digital IO pin, you have to
change the program’s first line. In the setup method, we set the serial port’s
baud rate to 9600, because we’d like to see some sensor data on the serial
monitor.
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Arduino uno Specifications

General

Form factor	Arduino
Certification	RoHS, FC, CE
Processor model	-
Processor frequency	- MHz
Microcontroller model	ATmega328
Microcontroller frequency	16 MHz
DC input voltage	7-12 V
Operating voltage	5 V
DC current per I/O pin	40 mA
Flash memory	0.032 MB
Maximum internal memory	- GB
SRAM (Static Random Access Memory)	2 KB
EEPROM (Electrically Erasable Programmable Read-Only Memory)	1 KB
Wi-Fi	No
Number of analog I/O pins	6
Number of digital I/O pins	14

Weight and Dimensions

Board dimensions	53.4 x 68.6 mm