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Topics - PCook

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OLEDs / NHD-042ODZW-AY5 No Display
« on: December 22, 2014, 02:36:34 PM »
Hi Folks;

Perhaps someone can help get me past this situation.

I have a newly purchased NHD-042ODZW-AY5 OLED display. I have altered the jumpers to run the display in serial mode (SPI), driven by a Netdunio Plus 2. I can't get anything to display. The clock (SCL), chip select (CS), and input (SDI) all appear correct using an oscilloscope. The power is 5v at the display and the ground is good. I am drawing power/ground from the Netduino board's 5v/GND output pins. I'm fairly certain my code is outputting the correct commands, although I'm not certain if the commands are being read by the display because I'm not sure how to send a R/W command to the display - this could actually be my problem.

Is there a way to test the display unit that does not involve input signals such as CS, SDI, etc? In other words, does the display have a "test" mode so that I can at least determine that I don't have a DOA unit?

Thanks!

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OLEDs / NHD-042ODZW-AY5 Jumpers for Serial Interface
« on: December 18, 2014, 01:29:09 PM »
I recently purchased a 4x20 character display (NHD-042ODZW-AY5). I would like to run this OLED from a Netduino Plus 2 using the SPI interface. However, I am not clear of the OLED unit's jumpers to get a "Serial MPU" interface configuration. I am following the OLED's spec document. My specific questions are:

1. When the spec sheet calls for an "OPEN" jumper, do I need to unsolder the factory installed surface mount resister and remove it from the board entirely?

2. When the spec sheet calls for an "L" jumper, do I need to unsolder the factory installed surface mount resister and resolder it in a new position?

3. Or, should I not have to unsolder anything and ignore the spec sheet implying that the pull-up / pull-down resisters need to be altered on the board and just solder a bridge between jumper pads for JCS1 and JCS2?

Any help would be appreciated because I can't get the OLED display to do anything at the moment. I'll take even little clues as to how to change the jumpers for a"Serial MPU" interface.

Thanks
Pat

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