Hey all,
Just bought a Wemos Oled shield and am trying to get it to work with an Arduino pro mini.
I have connected it as follows
Oled Pro mini
ground to ground
3.3 volt to a voltage divider from Vcc. It tests ok at 3.3 volts...
D1 to A5 SCL
D2 to A4 SDA
When I run an I2C scanner it returns no result as It just says I2c scanner.. Scanning....
#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
}
And there it sits .......
I have tested the A4 and A5 with a simple blink code and both pins return 5 volts so they should be ok.
I have included the pinouts of the Oled shield and the Pro mini.
I have ordered another different type of oled shield to see if mine was DOA.
Any help appreciated.
