...also show your connections.
Have you used I2C pull-up resistors? Not using pull-up resistors is a common I2C error when moving to Teensy.
no, but i can see the i2c address of oled by this prog isnt it enugh?
do i still need pull up resistors?
#include <Wire.h>
// -------------------------------------------------------------
// SET~UP SET~UP SET~UP SET~UP SET~UP SET~UP
// -------------------------------------------------------------
void setup()
{
Wire.begin();
Serial.begin(9600);
Serial.println("--------------------------");
Serial.println("I2C Hex hexAddress Scanner");
Serial.println("--------------------------");
}
// -------------------------------------------------------------
// LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP LOOP
// -------------------------------------------------------------
void loop()
{
byte response, hexAddress;
int deviceCnt = 0;
Serial.println("Scanning...");
for (hexAddress = 1; hexAddress < 127; hexAddress++ )
{
// Start transmitting on every known hex hexAddress
Wire.beginTransmission(hexAddress);
// See if something acknowledged the transmission
response = Wire.endTransmission();
if (response == 0)
{
Serial.print("I2C device found at hexAddress 0x");
if (hexAddress < 16)
Serial.print("0");
Serial.println(hexAddress, HEX);
deviceCnt++;
}
else if (response == 4) // unknown error
{
Serial.print("Unknown response at hexAddress 0x");
if (hexAddress < 16)
Serial.print("0");
Serial.println(hexAddress, HEX);
}
}
// Nothing found at any of the hexAddresses, boo
if (deviceCnt == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("Scan completed.\n");
// Delay 5 seconds and repeat scan
delay(5000);
}
