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//==NodeMCU==START
#define D0 (16)
#define D1 (5) //SCL
#define D2 (4) //SDA
#define D3 (0)
#define D4 (2)
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
#define SD0 (7)
#define SD1 (8)
#define SD2 (9)
#define SD3 (10)
//==NodeMCU==END
#include <Wire.h>
void find_i2c_address()
{
Serial.println ("I2C Scanning ......");
bool found_flag = false;
Wire.begin(D2,D1); //SDA(D2), SCL(D1)
for (int i = 1; i < 128; i++)
{
Wire.beginTransmission (i);
if (Wire.endTransmission () == 0)
{
Serial.print ("I2C Address: 0x");
Serial.println (i, HEX);
found_flag = true;
}
}
if(!found_flag)
Serial.println ("can not found i2c address.");
delay(1000);
}
void setup() {
Serial.begin (115200);
Serial.println();
delay(3000);
}//setup
void loop()
{
find_i2c_address();
}
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cs |
Result
lcd: 16x2
| I2C Scanning ...... I2C Address: 0x3F I2C Scanning ...... I2C Address: 0x3F I2C Scanning ...... I2C Address: 0x3F |
lcd: 20x4
| I2C Address: 0x27 I2C Scanning ...... I2C Address: 0x27 I2C Scanning ...... I2C Address: 0x27 |
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