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Forum : Digole Serial Display :

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freak
Total Posts:
10 
Since:
2015-Jan-09 
From:
United States

only works in UART mode

Posted at:2015-01-09 19:56:20 Edited at:2015-01-09 19:58:04    

I have a serial color oled 160x120.  I cannot get the screen to work in SPI or I2C mode.  I have soldered the jumper and tested both SPI and I2C and it still does not work.  I am using an arduio nano.  Tried pullups on SDA/SCL with I2C.  Removed solder bridge, went back to UART and works fine.   The config screen did respond showing the correct mode so I know I soldered correctly.  Not sure what else to check.  Could this screen be bad?
Administrator
Total Posts:
45 
Since:
2013-Dec-22 
From:
Canada

RE:only works in UART mode

Posted at:2015-05-09 20:00:43 Edited at:2015-05-09 20:09:56    

 How did you connect the display module with your nano?

A4 is SDA, A5 is SCL on nano.

Also, you have to change the mode config in our sample code, see the comment line of the begin on code.
freak
Total Posts:
10 
Since:
2015-Jan-09 
From:
United States

RE:only works in UART mode

Posted at:2015-05-09 20:51:26 Edited at:2015-05-09 20:52:16    

yes a4 and a5 on the nano and yes I set up the correct code and defines to match the jumper mode.  Tried it all again (soldering jumpers/coding) on my uno with no luck as well.
Administrator
Total Posts:
45 
Since:
2013-Dec-22 
From:
Canada

RE:only works in UART mode

Posted at:2015-05-09 21:00:05     

 Then, there is no reason it doesn't work, please try the I2C sanner to see if you can find the I2C port:

http://playground.arduino.cc/Main/I2cScanner
freak
Total Posts:
10 
Since:
2015-Jan-09 
From:
United States

RE:only works in UART mode

Posted at:2015-05-10 03:17:22     

Just tried i2c scanner...

 

Scanning...
No I2C devices found

Scanning...
No I2C devices found

Scanning...
No I2C devices found

Scanning...
No I2C devices found

 

Then connected a sainsmart 20x4 lcd and i2c scanner found it right away.
freak
Total Posts:
10 
Since:
2015-Jan-09 
From:
United States

RE:only works in UART mode

Posted at:2015-05-10 22:28:07     

Resoldered a few pins and cleaned between a few pins per support and it's working now!  Thanks!
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