Dear all, I just received this 0.96 Inch Yellow and Blue I2C IIC Serial 128X64 OLED Display Module for Arduino:
According to the datasheet, VCC can be connected to the 5V pin, GND to Ground, SDA to A4, SCL to A5.
I am using a free scanner i2C_LCD_Scanner sketch provided online (pasted below). When I plug the display into my Arduino UNO, the Scanner Sketch identifies the display because it finds the address as "0x3C" in the Monitor Window. Then, I loaded some sample code and libraries and the LCD display works great (the sample code shows the LCD display the Adafruit logo. Sample code for that not pasted below, but I can if you want).
If I plug the display into my Arduino Micro, exact same pinout configuration and same i2C_LCD_Scanner sketch (pasted below), the Monitor window says "No I2C devices found." I have tried switching to the 3.3V pin instead, I have tried different combinations of Analog pins (e.g. A0 and A1 instead of A4 and A5). Nothing seems to work.
Any ideas?
Thank you!
I2C Scanner Sketch:
// --------------------------------------
// 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
}
