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Arduino i2c scanner (ESP8266)

This is a basic example which will display via the serial monitor the address of any devices connected to your Wemos / Nodemcu. Download code here Code.

Its the same as one used on Arduino’s.

#include "Wire.h"
void setup()
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
void loop()
  byte error, address;
  int nDevices;
  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.
    error = Wire.endTransmission();
    if (error == 0)
      Serial.print("I2C device found at address 0x");
      if (address<16 0="" 0x="" 5="" address="" at="" delay="" devices="" done="" else="" error="" for="" found="" i2c="" if="" n="" ndevices="=" next="" nknown="" o="" pre="" scan="" seconds="" serial.print="" serial.println="" wait="">

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