I2C Scanner
// --------------------------------------
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// https://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\nI2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(5000); // wait 5 seconds for next scan
}
소스 코드 예시
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x20, 16, 2);
void setup() {
lcd.begin(16, 2);
lcd.init();
lcd.backlight();
}
void loop() {
lcd.setCursor(0, 0);
lcd.print("Hello, World!");
lcd.setCursor(0, 1);
lcd.print("Arduino I2C LCD");
}
소스 코드 예시
#define echoPin 3
#define trigPin 4
void setup() {
pinMode(echoPin, INPUT);
pinMode(trigPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
long dist = (pulseIn(echoPin, HIGH)) / 58.2;
Serial.println(dist);
if (dist < 10) {
tone(11, 362, 100);
delay(100);
} else if (dist < 20) {
tone(11, 362, 100);
delay(250);
} else if (dist < 30) {
tone(11, 362, 100);
delay(500);
} else {
noTone(11);
}
}
소스 코드 예시
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
int trigPin = 9;
int echoPin = 10;
LiquidCrystal_I2C lcd(0x20, 16, 2);
void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
lcd.begin(16, 2);
lcd.init();
lcd.backlight();
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
long duration = pulseIn(echoPin, HIGH);
float distance = duration * 0.0343 / 2;
lcd.setCursor(0, 0);
lcd.print("Dist : ");
lcd.print(distance);
lcd.print("cm");
delay(1000);
}
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