128*64 LCD not working

malhar_thaker · April 21, 2024, 1:13pm

I'm in a bit of a pinch right now.
So, I have a ST7920 128*64 LCD, and it won't work no matter what i do. Only the backlight works, and I can control it with a 10Kpot. No code works, no tutorial works. as per my understanding all the wirings are fine (crosschecked it multiple times with different tutorials).

Currently I'm referring to this article. [Reference Article] (Interfacing 128 x 64 Graphical LCD With Arduino)

LCD Datasheet https://i.im.ge/2024/04/21/ZanJOT.tech1737-16-768x887.webp

This is my setup.

VIDEO -https://www.flexclip.com/share/572274815e8b10015b1ed6c2450e08a5161c287.html

As you can see in the video, I am able to control the brightness with a 10K Pot.
I've tried everything but nothing seems to be working. Please help.

Thanks

camsysca · April 21, 2024, 1:40pm

So if your wiring is perfect, it must be your code, which you saw fit not to provide. See a problem here? Use code tags, and post it in a new message.

To avoid the usual 20 questions, a description of what your project is about, and what the code is supposed to do, would also be useful.

malhar_thaker · April 21, 2024, 2:03pm

My project is to make a space invaders arcade game, but for starters I'm using a code from https://www.makerguides.com/interfacing-128-x-64-graphical-lcd-with-arduino/. This code simply displays an image. Here is the code I'm using.

#include "Arduino.h"
#include "U8g2lib.h"
 
#ifdef U8X8_HAVE_HW_SPI
#include "SPI.h"
#endif
#ifdef U8X8_HAVE_HW_I2C
#include "Wire.h"
#endif
 
// 'TheOffice', 128x64px, source: //https://www.electronicshub.org/interfacing-128x64-graphical-lcd-with-arduino/
 
static const unsigned char myBitmap [] PROGMEM = {
 
  0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xff, 0x3f, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x06, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7,
  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0xff, 0xff, 0xff,
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  0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x03, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0,
  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0xb0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0, 0x01, 0x00, 0x00, 0x00,
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  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x00, 0xb0,
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  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0xf8, 0xff, 0x07,
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  0x08, 0xf8, 0xff, 0x07, 0x00, 0x00, 0xfe, 0xb0, 0x01, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x08, 0xf8, 0xff, 0x07, 0x00, 0x00, 0xfe, 0xb0,
  0x81, 0xff, 0x1d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0xf8, 0xff, 0x0f,
  0x00, 0x00, 0xfe, 0xb0, 0x81, 0xff, 0x1d, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x08, 0xf8, 0xff, 0x0f, 0x00, 0x00, 0xfe, 0xb0, 0x81, 0xff, 0x1d, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x0f, 0x00, 0x00, 0xfe, 0xb0,
  0x01, 0x38, 0xdc, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x0f,
  0x00, 0x00, 0x7c, 0xb0, 0x01, 0x38, 0xfc, 0xf3, 0x03, 0x00, 0x00, 0x00,
  0x08, 0xfc, 0xff, 0x0f, 0x00, 0x00, 0x38, 0xb0, 0x01, 0x38, 0xfc, 0xfb,
  0x07, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x0f, 0x00, 0x00, 0xfc, 0xb0,
  0x01, 0x38, 0x9c, 0x3b, 0x07, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x07,
  0x00, 0x00, 0xfe, 0xb0, 0x01, 0x38, 0x9c, 0xfb, 0x07, 0x00, 0x00, 0x00,
  0x08, 0xfc, 0xff, 0x07, 0x00, 0x00, 0xfe, 0xb7, 0x01, 0x38, 0x9c, 0xfb,
  0x07, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x07, 0x00, 0x00, 0xfe, 0xb7,
  0x01, 0x38, 0x9c, 0x3b, 0x07, 0x00, 0x00, 0x00, 0x08, 0xfc, 0xff, 0x07,
  0x00, 0x00, 0xfe, 0xb7, 0x01, 0x38, 0x9c, 0xfb, 0x07, 0x00, 0x00, 0x00,
  0x08, 0xfe, 0xff, 0x07, 0x00, 0x00, 0xff, 0xb7, 0x01, 0x38, 0x9c, 0xf3,
  0x03, 0x00, 0x00, 0x00, 0x08, 0xfe, 0xff, 0x07, 0x00, 0x80, 0xff, 0xb7,
  0x01, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0x00,
  0x00, 0xc0, 0xff, 0xb6, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0xc8, 0xff, 0xff, 0x00, 0x00, 0xe0, 0xff, 0xb6, 0x01, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0x00, 0x00, 0xfe, 0xff, 0xb6,
  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0x00,
  0xc0, 0xff, 0xff, 0xb6, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0xc8, 0xff, 0xff, 0x00, 0xe0, 0xff, 0xff, 0xb6, 0x01, 0xf8, 0x07, 0xbe,
  0xff, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0x00, 0xe0, 0x7f, 0xff, 0xb7,
  0x01, 0xfc, 0x1f, 0xbf, 0xff, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0xfc,
  0xff, 0x0f, 0xff, 0xb7, 0x01, 0xfe, 0x1f, 0xbf, 0xff, 0x00, 0x00, 0x00,
  0xc8, 0xff, 0xff, 0xfc, 0xff, 0xef, 0xff, 0xb7, 0x01, 0x1f, 0x3e, 0x8f,
  0x03, 0x00, 0x00, 0x00, 0xc8, 0xff, 0xff, 0xc0, 0x01, 0xfe, 0xff, 0xb7,
  0x01, 0x0f, 0xbc, 0xff, 0xef, 0xf0, 0x87, 0x1f, 0xc8, 0xff, 0xff, 0xc0,
  0x01, 0xff, 0xff, 0xb7, 0x01, 0x0f, 0xbc, 0xff, 0xef, 0xf8, 0xcf, 0x3f,
  0xc8, 0xff, 0xff, 0xc0, 0x01, 0xff, 0xff, 0xb7, 0x01, 0x0f, 0xb8, 0xff,
  0xef, 0xfc, 0xef, 0x3f, 0xc8, 0xff, 0xff, 0xc0, 0x01, 0xff, 0x7f, 0xb7,
  0x01, 0x0f, 0x38, 0x8f, 0xe3, 0x3c, 0xef, 0x79, 0x08, 0xc0, 0x7f, 0xc0,
  0x81, 0xff, 0x1f, 0xb7, 0x01, 0x0f, 0x3c, 0x8f, 0xe3, 0x3c, 0xe0, 0x7f,
  0x08, 0xc0, 0x7f, 0xc0, 0x81, 0xef, 0xff, 0xb7, 0x01, 0x0f, 0x3c, 0x8f,
  0xe3, 0x1c, 0xe0, 0x7f, 0x08, 0xc0, 0x7f, 0xc0, 0x81, 0xef, 0xff, 0xb7,
  0x01, 0x1f, 0x3c, 0x8f, 0xe3, 0x3c, 0xe6, 0x7f, 0x08, 0xc0, 0x7f, 0xc0,
  0x81, 0xe7, 0xff, 0xb7, 0x01, 0x3e, 0x3e, 0x8f, 0xe3, 0x3c, 0xef, 0x79,
  0x08, 0x80, 0x7b, 0xc0, 0xc1, 0x67, 0x00, 0xb7, 0x01, 0xfe, 0x1f, 0x8f,
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  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0xc0,
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  0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0, 0x03, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0,
  0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0xbc, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0xe0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xcf, 0x06, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0,
  0xfc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0xff, 0xff, 0xff, 0x7f
};
 
 
U8G2_ST7920_128X64_F_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* CS=*/ 10, /* reset=*/ 8);
 
 
void draw(void)
{
  u8g2.drawXBMP( 0, 0, 128, 64, myBitmap);
}
 
 
void setup()
{
  // put your setup code here, to run once:
  u8g2.begin();
  u8g2.clearBuffer();
}
 
void loop()
{
  // put your main code here, to run repeatedly:
  u8g2.firstPage();
  do
  {
    draw();
  } while (u8g2.nextPage());
 
  delay(1000);
}

Rintin · April 21, 2024, 2:18pm

The connections on the Uno to the pot screams "bad connection" to me...

It seems that the ST7920 supports parallel mode and serial mode. How is your display configured?

malhar_thaker · April 21, 2024, 2:29pm

I am using the SPI interface supported by the LCD controller. (3 wire SPI i guess)
The GPIO13 Pin on the Arduino is the SPI clock pin. The “E” pin on the LCD board is the Clock pin. RS pin of the LCD is the Chip select pin.
RW pin acts as SPI data input pin for the LCD. MOSI pin of the Arduino is Pin 11.
Pin 10 of the Arduino is the SPI slave select pin.

Yes, I am aware of the loose pot connection as I was just trying different things to make something work. I will surely connect it properly using a breadboard once the issue is figured out, Thanks a lot.

Rintin · April 21, 2024, 2:35pm

Ok, now what does the display expect you to use?

david_2018 · April 21, 2024, 2:37pm

The constructor is for software SPI, have you tried hardware SPI?
Have you tried hooking up the reset pin?
The constructor is for a full buffer, the firstpage()/nextpage() loop is for a paged buffer.

Have you tried any of the examples sketches from the U8g2 library?

malhar_thaker · April 21, 2024, 3:23pm

Yes, I did try the "Hello World", in page buffer from the u8g2 library examples. As I'm a beginner i followed a tutorial for this.
I didn't connect a reset pin, so I used:
U8X8_PIN_NONE
I will try using the reset pin instead, thanks for the suggestion.

malhar_thaker · April 21, 2024, 3:26pm

I'm sorry but I'm unaware of what this means. Please help me to fix this

malhar_thaker · April 21, 2024, 3:27pm

SP7920 supports three different types of interfaces: 8 bit, 4 bit, and Serial SPI interface. I am yet to try the 8 bit and 4 bit interfaces

Rintin · April 22, 2024, 5:58pm

Any success so far?

From the datasheet I found, the chip could also be a KS0108.

PaulRB · April 22, 2024, 6:23pm

How do you know that's what it is?

If the only reason is that it's what some vendor on eBay or AliExpress said it was, they could be mistaken, especially if they also sell bikinis and false plastic nails.

If it is a ks0108 that @Rintin mentioned, that would certainly explain your problem, because that driver chip has no SPI feature.

van_der_decken · April 22, 2024, 6:40pm

Although your pictures never show the entire back side of your display, it appears to be a JHD12684E type, and the datasheet you linked to collaborates that. Which, as both @Rintin and @PaulRB noted, is based on a KS0108 controller, and has a parallel interface.

See below for an example of how to work with this type of display:

PaulRB · April 22, 2024, 7:00pm

Here's a picture of one of my 12864 displays. It looks very similar to your pictures. My display is a ks0108.

Not having an SPI interface, a ks0108 display is going to take up more of your Uno's pins. I wasn't aware it had a 4-pin parallel interface, I thought it was only 8-pin parallel.

I solved that problem with an i2c backpack. These are different from the common i2c backpacks for 1602 and 2004 character displays, but it will work with those also.

Rintin · April 22, 2024, 9:03pm

The KS0108 is 8 bit parallel only.

PaulRB · April 22, 2024, 9:28pm

Thought so.

It's st7920 that has 8-bit, 4-bit & SPI.

malhar_thaker · April 27, 2024, 11:50pm

It was, afterall a KS0108 display. And it works perfectly now. Thankyou all, @Rintin @PaulRB @van_der_decken @david_2018 @camsysca for helping me out on this issue.

The website from which I bought this lcd is an Electronic-tech wholesaler and in the product description they clearly state "The Graphic LCD Display 128×64 (Blue) – JHD Make is based on the ST7920 controller." which led to me believing it to be ST7920. (idk how a tech retailer can make such a dumb mistake)

Grateful for your help!

malhar_thaker · April 27, 2024, 11:57pm

Yes I have the same display! For my current project I don't find it essential to use an i2c backpack because I don't need extra Arduino pins, but for my future projects with more add on elements it will surely be very helpful. Thanks!

system · October 24, 2024, 11:57pm

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