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Character LCDs / Re: NHD-0220FZ-FSW-GBW-P-33V3
« Last post by Alee_S on January 25, 2019, 03:07:24 PM »
Hi again,

PORTD consists of my data lines(DB4-DB7 for 4-bit mode), while PORTB consists of my control lines(Enable, R/W, and R/S). 

You mentioned you have been using 2 additional pins on the same port as DB4-DB7. I would recommend separating your control lines and data lines and keeping them on separate Ports.

TFTs / Re: NHD-5.0-HDMI-N-RTXL-CTU Digital Dimming Control
« Last post by georgek on January 25, 2019, 09:08:12 AM »
Any chance for finding a solution for the NHD-5.0-HDMI-N-RTXL-CTU Digital Dimming Control with one-wire interface?
Character LCDs / Poor legibility on NHD-0224WH-ATDI-JT
« Last post by Alnitak on January 24, 2019, 05:24:46 PM »
I've just installed a white-on-black LCD in an old synth, but the legibility is very poor.

Is this indicative of too bright a backlight, or poor contrast settings?    Only the very top of the unit's (software controlled) range of settings is even remotely usable.

I already put a 50R resistor in the backlight cable, on the basis of 3.5V forward LED voltage at 32mA.  If it is simply that the backlight is too bright, I'd rather not remake that cable.   I noticed there's a 0R 1206 resistor on the back of the display that looks like it might be in the backlight circuit.  Is that so?    I do have the necessary equipment and components to drop extra resistance in there if required.
OLEDs / Re: Noise from on-board DC-DC converter
« Last post by sherloc987 on January 24, 2019, 08:29:27 AM »
We were able to attenuate the ripple by bypassing VCC to ground with a 470 uF capacitor at the point where the VCC is applied to the OLED display.  However, the amplitude of the ripple is still sufficient to produce less than optimal results from the other circuitry on the board.
Character LCDs / Re: NHD-C0220BiZ-FSW-FBW-3V3M I2C SDA glitch and freeze.
« Last post by rubyatiy on January 23, 2019, 08:57:05 AM »
Thanks for illustrating the problem, it is interesting. phenq reviews ST7036 data sheet, my two cents...

1. After a follower command a delay of > 200 ms is required for "power stable" (p41).

2) At 3.3v the max I2C clock speed is 300kHz (p54). If I am reading the pics correctly, you are below that, but if you could slow down the I2C I wonder what effect it would have on the glitch.

Not sure that either of these are related to the issue you are experiencing.

Hi Doum, I noticed something similar. Are you still having this issue?

All of these are not making the trouble inside and outside because of those legendary things
Character LCDs / Re: Static Discharge recommendation
« Last post by Virginia Controls on January 21, 2019, 01:19:00 PM »
In answering my own question, I found New Haven's Handling Procedures document - which appropriately warns of the ESD sensitivity of CMOS components.  I get that.  What I am looking for is suggestions on how I can improve the displays protection against ESD when it is shipped to customers who will most likely not have an ESD program in place.

I personally have zapped 3 displays by touching them with my knuckle on the lower right edge of the PC board (we have a keypad mounted right below the display, so it is easy to accidentally touch the display.)

Somewhere on New Haven's website, there is a reference to Elwood Controls who makes bezels for the displays.  I contacted them, but we could not agree on how to design a custom bezel to completely cover this particular display.  This issue is made worse by the fact that the NHD drawing in the data sheet does not exactly match the actual display.  The back light panel is longer than the drawing shows and the back light LED leads wrap around the right edge of the PC board instead of going through the PC board.
Character LCDs / Static Discharge recommendation
« Last post by Virginia Controls on January 21, 2019, 12:53:23 PM »
We use the ND-0420DZ-FSW-FBW in our product.  We have accidentally 'zapped' 4 displays with electrostatic charges (ESD) recently that cause the displays to either go blank or show random streaks through the display.  What is the ESD rating on the display and is there anywhere on the display that can be grounded to make is less sensitive to ESD?
TFTs / Connect NHD2.4-240320CF to ARM M0
« Last post by charsmud on January 20, 2019, 11:52:37 PM »
I'm a little confused by the wiring diagram provided.  How am I supposed to connect the pins to an ARM M0 (Specifically and this TFT: ) Do I just connect CS, DC, WR, RD, DB0 to DB15 and RES to GPIOs?
Character LCDs / Re: NHD-0220FZ-FSW-GBW-P-33V3
« Last post by timbro on January 19, 2019, 05:36:48 AM »
Hi Alee_S,

There is no problem with contrast. it can be changed from 0.004 <-> 3.294 Vdc. It is a 10 turn pot and I have tried it across the full range.
By default the display is in 1-line mode. It has become pretty clear to us that it is not accepting 2-line configuration. Still have no idea why.
I have another question about your code... what does your PORTD consist of?
We are using 2 pins on the same port that we also use for DB4<->DB7, so we are setting these, (DB4<->DB7), bitwise - however, there is something quite strange - you apply 0x28 for 2-line mode (0010 1000)  - you don't send each nibble separately, so it would be very helpful to me if you could tell me exactly what you have connected to PORTB - bits 0 through 7, what are they connected to?

Kind regards   
Character LCDs / Re: NHD-0220FZ-FSW-GBW-P-33V3
« Last post by Alee_S on January 17, 2019, 09:34:57 AM »
Hi timbro,

For more information on 'Internal Reset Circuit', please see the attachment below, taken from Pg. 22 of the ST7066U controller datasheet. Please note those instructions are executed in the initialization section of the code I have provided.

The LCD working in 1-line mode is a good sign! It seems that under 2-line mode, the LCD is not receiving enough contrast to show the text properly. Try adjusting the contrast voltage on Pin 3, and hopefully that will do the trick.
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