SSD1306 component add an address

[stefan.erni]

Hi Ben

There is a small Display with a SSD1306 controller
and a Flowcode component SSD1306 I2C

Unfortunately I cannot change the I2C address to 0x3C.
would it be possible to adapt the components with this address?

regards
Stefan


Communication Protocols: I2C
IC: SSD1306
I2C Address: 0x3C
Dimensions: 50.3 x 15.1mm

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Infos:
https://www.sparkfun.com/products/17153
Component propertis:

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Adapter Groove to Stemma cable available for little money....:

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[medelec35]

Hi Stefan.
0x3C is bit shifted 0x78 (0).
Can you see if that works for the display?

You could confirm the address with I2C address scanner

[stefan.erni]

Hi Martin

I can see the bit shifted but it's not working if I use address 0x78.
Before i tested an another big display (old) with 0x78 and this is working.

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[medelec35]

Have you tried the scanner?
For ESP32, you will need to use it in software mode.
Or use it with Arduino Uno

[stefan.erni]

Yes, but what does this mean?
The new Display has the same address 0x78 but an another reason why it's dark?

[medelec35]

hi Stefan.
That does suggest that 0x78 selected for the display is correct.
Within initialise routine this is used for the address:

Code: Select all

Address >> 1

Since Address is 0x78 then 0x78>>1 = 0x78/2 = 0x3C
Therefore, adding different addresses won't work.
Have you tried in software mode?
Although you did state an older display does work, which suggests I2C is working OK.

[stefan.erni]

Hi Martin

Yes I agree :Therefore, adding different addresses won't work.

I'll see if I can organize another type display with the SSD1306
controller and a second display from sparkfun

maybe the other display will work soon...
https://flowcode.co.uk/forums/viewtopic.php?f=5&t=2267

strange the display that works has a different controller(not a SSD1306) but i can read the text.
https://wiki.seeedstudio.com/Grove-OLED ... _1.12inch/
SSD1327 to SH1107G