Hi,
I have an RG12864E 128x64 GLCD. The LCD shows a white screen without an external potentiometer and a blue screen with it. Some YouTube videos instruct to adjust the onboard pot, but there is no onboard pot on this LCD.
I have tried all the available graphics LCD libraries but can't make it work.
Request you to please help.
Thank you
Please post a link to the actual display that you have bought.
Then we don't have to guess.
Google found RG12864E series 128x64 LCD 113.0mm x 53.0mm - Easby Electronics
Please confirm if it is the correct display.
RG1286E appears to have NT0108 controller which is the equivalent of KS0108.
Install U8g2lib or other KS0108 library.
Connect a pot between pin #1, pin#18 with the slider to pin#3. Adjust for contrast.
David.
Hi David,
Thanks for the reply. I don't have much details about the LCD as it was bought from a local electronics store. Please find the images attached. However, I will try what you have suggested and will let you know the results.
Thank you
Hi David,
I tried using KS0108 Library and got an error. The error is:
Arduino: 1.8.16 (Windows 10), Board: "Arduino Uno"
In file included from C:<Path>\Arduino\libraries\KS0108-master\examples\GLCDexample\GLCDexample.pde:11:0:
C:<Path>\libraries\KS0108-master/ks0108.h:32:17: error: conflicting declaration 'typedef uint8_t boolean'
typedef uint8_t boolean;
^~~~~~~
In file included from sketch\GLCDexample.pde.cpp:1:0:
C:\Users<Path>\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\cores\arduino/Arduino.h:126:14: note: previous declaration as 'typedef bool boolean'
typedef bool boolean;
^~~~~~~
In file included from C:\Users<Path>\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\cores\arduino/Arduino.h:28:0,
from sketch\GLCDexample.pde.cpp:1:
C:<Path>\libraries\KS0108-master/Arial14.h:48:27: error: variable 'Arial_14' must be const in order to be put into read-only section by means of 'attribute((progmem))'
static uint8_t Arial_14[ ] PROGMEM = {
^
C:<Path>\libraries\KS0108-master/SystemFont5x7.h:41:28: error: variable 'System5x7' must be const in order to be put into read-only section by means of 'attribute((progmem))'
static uint8_t System5x7[ ] PROGMEM = {
^
C:<Path>\libraries\KS0108-master/ArduinoIcon.h:11:30: error: variable 'ArduinoIcon' must be const in order to be put into read-only section by means of 'attribute((progmem))'
static uint8_t ArduinoIcon[ ] PROGMEM = {
^
exit status 1
Error compiling for board Arduino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
When I used U8g2lib, the display turns on and shows this:
Thank you.
Please copy-paste your U8g2lib constructor statement.
And describe your wiring i.e. which Arduino pin to which KS0108 pin.
I don't know the KS0108-master library. It does not sound like a Library Manager supported library.
David.
This is the constructor statement:
U8G2_SSD1306_128X64_NONAME_F_3W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* cs=*/ 10, /* reset=*/ 8);
| GLCD | Arduino | Pot |
|---|---|---|
| Pin 1 (Vss) | GND | Pin 1 of Pot |
| Pin 2 (Vcc) | 5V | - |
| Pin 3 (Vo) | - | Pin 2 (Slider) of Pot |
| Pin 4 (RS) | 10 | - |
| Pin 5 (R/W) | 11 | - |
| Pin 6 (En) | 13 | - |
| Pin 15 (CS1) | GND | - |
| Pin 17 (RST) | 8 | - |
| Pin 18 (Vee) | - | Pin 3 of Pot |
| Pin 19 (BLA) | 3.3V | - |
| Pin 20 (BLK) | GND | - |
Thank you
This is how I connect a KS0108 display to a Uno:
U8G2_KS0108_128X64_F u8g2(U8G2_R0, 8, 9, 2, 3, 4, 5, 6, 7, A2, A0, A3, A4, U8X8_PIN_NONE, A5);
| GLCD | Arduino | Pot |
|---|---|---|
| Pin 1 (Vss) | GND | Pin 1 of Pot |
| Pin 2 (Vcc) | 5V | - |
| Pin 3 (Vo) | - | Pin 2 (Slider) of Pot |
| Pin 4 (RS) | A0 | - |
| Pin 5 (R/W) | GND | - |
| Pin 6 (En) | A2 | - |
| Pin 7 (DB0) | 8 | - |
| Pin 8 (DB1) | 9 | - |
| Pin 9 (DB2) | 2 | - |
| Pin 10 (DB3) | 3 | - |
| Pin 11 (DB4) | 4 | - |
| Pin 12 (DB5) | 5 | - |
| Pin 13 (DB6) | 6 | - |
| Pin 14 (DB7) | 7 | - |
| Pin 15 (CS1) | A3 | - |
| Pin 16 (CS2) | A4 | - |
| Pin 17 (RST) | A5 | - |
| Pin 18 (Vee) | - | Pin 3 of Pot |
| Pin 19 (BLA) | 3.3V | - |
| Pin 20 (BLK) | GND | - |
I suggest that you follow my wiring scheme and copy-paste my constructor.
Run all the U8g2 examples with this constructor.
When you are sure that everything is 100% you can change the wiring scheme for your convenience.
You have probably noticed that this display uses most of your Arduino pins. Leaving 10-13 for SPI and A1 for an Analog sensor.
David.
p.s. this adapter can make your KS0108 run on I2C.
https://www.ebay.co.uk/itm/263769081656
Hi David,
It works like a charm! I am immensely grateful to you! I thought that the display was not working, and it was lying around for a couple of years. Finally, it is working because of your guidance! Thanks again.
Sincerely,
Shreyas
KS0108 works ok but uses a lot of wires.
Yes, I see that. Thanks again.
Sincerely,
Shreyas
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