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Messages - Saurabh_B

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OLEDs / Re: Odd LCD Behavior
« on: November 12, 2015, 01:11:49 PM »
Would it be possible to take a picture of how the display looks?
It would also help if you can post the code where you are writing the characters.

OLEDs / Re: OLED SPI Chip Select (CS)
« on: November 10, 2015, 01:22:06 PM »

You should be fine grounding the CS pin on the display, it will still work.

OLEDs / Re: NHD0420CW-Ax3 display with Arduino Uno - Tutorials
« on: November 06, 2015, 08:35:50 AM »

Would you be able to post the code snipped of how you are adjusting the contrast?

Customer Projects / Korg Wavestation (A/D & EX Models) LCD Replacement
« on: November 05, 2015, 10:08:32 AM »
This is pretty useful for anyone who want to replace the LCD for their Korg Wavestations (A/D and EX models). The backlight on these synthesizers uses and electroluminescent panel. These often have lower lifetime ratings, and could possibly burn out. These panels also require a power inverter that might emit an annoying high pitch noise while operating.

Here are links to a couple of customer projects which replace the LCD on their old Wavestations with the NHD-24064WG-ASMI-VZ#. (A/D) (EX)

The NHD-24064WG-ASMI-VS# has been replaced by the NHD-24064WG-ATMI-VZ#, this is an equivalent display, the only difference between the two is a difference in the LEDs used for the backlight.  Another option is the NHD-24064WG-ATFH-VZ# which has a FSTN(+) display.

Character LCDs / Re: NHD-0420H1Z-FL-GBW-33V3 - 2 Lines Mode Problem
« on: October 29, 2015, 01:23:58 PM »
Well thank you for the heads up.

OLEDs / Re: Problem with NHD 0420CW AY3 Display
« on: October 28, 2015, 11:53:22 AM »
Any chance you would be able to upload your initialization sequence?

OLEDs / Re: Problem with NHD 0420CW AY3 Display
« on: October 27, 2015, 03:16:23 PM »
The pullup resistors will depend on the MPU you are using. If it does already have pull up resistors built in (Like the arduino Mega) you wouldn't need any. But we prefer using 10k resistors if they aren't on the input lines. 

Can you tell me what slave address you are using, and if you are enabling the internal voltage regulator for 5V.

The pins that are no connects should be tied to ground.

Character LCDs / Re: NHD-0420H1Z-FL-GBW-33V3 - 2 Lines Mode Problem
« on: October 27, 2015, 03:12:30 PM »
The initialization seems to be fine.

The only thing i can imagine is that the when you are sending the 0x38 command to set 2 line mode it changing it from 1line mode, which could possibly blank out the screen.

If you would be able to email me at I can give you the code i wrote to test these displays. It is made for an arduino and it will work for all of our character displays that use the ST7066U controller.

Character LCDs / Re: NHD-0420H1Z-FL-GBW-33V3 - 2 Lines Mode Problem
« on: October 26, 2015, 10:31:31 AM »

Any chance you would be able to post your initialization sequence, along with how you are changing the line you are writing to?

The display moves onto line 3 because of the addressing, you can find the address table for the display on page 5 of the display specification here:

Here are links to example codes we have available on our website for this controller:

I also have another code for this display in 4bit mode using an arduino if you would be interested in that please email

Character LCDs / Re: Setting SPI mode for NHD-0429D3Z-NSW-BBW
« on: October 23, 2015, 08:19:23 AM »
Yes, that is where you would want to place a jumper. The board has recently been changed and I wasn't sure if you had the older or newer design.

OLEDs / Re: NHD-0220CW-AB3 "doubling" data?
« on: October 22, 2015, 12:07:51 PM »

I was wondering if you could share your wiring diagram, along with the initialization sequence you are using.

The initialization sequence for this display will be significantly different compared to the standard character OLED displays.

Character LCDs / Re: Setting SPI mode for NHD-0429D3Z-NSW-BBW
« on: October 22, 2015, 11:54:24 AM »

I you'll want to solder the jumper I marked in the following picture.

[attachment deleted by admin]

Graphic LCDs / Re: NHD‐240128WG-ATMI‐VZ#
« on: October 19, 2015, 02:59:07 PM »
Hi Rob,

There isn't a memory associated with these displays. You would tell the controller to display the pixel data onto the display. To write complete screen size images you would either have to convert the given image into hex by using a program such as LCD Assistant, or set up your MPU to read a given image and convert it into display data.

Graphic LCDs / Re: C128128BZ-FSW-GBW and SPI 3-wire
« on: October 15, 2015, 04:40:37 PM »

According to the controller datasheet:
In 3-Line mode, default message from MCU is command, the 2 bytes command of Set Data Direction & Display Data
Length must be set before display data send from MCU, after the display data is sent over, the next message is turned to
be command

I was wondering if you sent these 2 commands in the beginning?

If at all possible would you be able to share your schematic for how the display is setup along with your initialization to ensure you enable the internal regulator to generate the voltage required for the contrast.

You can see the controller datasheet here:
Pages 22 and 23 go into more detail about how the 3/4 wire SPI will work for this device.

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