ssd1306 wrong address?

[Yves]

Hello Picters,

I have a SSD1306 1 inch display looking at the back it indicate I2C address of 0x78  I kept trying to have it working in vain and before I decided to crush it with a sledge hammer I tried some different addresses and it lit up at 0x3C even though at the back it shows clearly that it is 0x78???. How is it possible?

cheers,

Yves

[david]

Hex 3C = Binary 111100
Add the Write bit and you get Binary 1111000 which equals Hex 78

I always use the following as I have been tripped up also-
Symbol OLED_W= %1111000  'OLED address and write
Symbol OLED_R= %1111001  'OLED address and read 

Cheers,
David