12864B Parallel/Serial Graphic LCD Module (HCMODU0032)

[admin]

Description:

The 12864B Graphic LCD module is a 128 x 64 pixel LCD display with a blue backlight and white foreground. The display is fully programmable and can display a combination of both graphics and text. It can operate in both parallel and serial (SPI) modes which can be configured by the external pin PSB (please see note below). In SPI mode only 3 data pins are required to drive this display. No potentiometer is required to set the contrast as this is pre set by the factory to optimum level.

This item can be purchased here.

1)Encapsulation:COB(Chip-on-Board)
2)Display Format:128x64 dots
3)Display Type:STN, Transflective, Positive, Blue
4)Controller: ST7920
5)Interface:8-bit parallel interface or serial SPI modes
6)Backlight:Blue/Bottom light
7)Viewing Direction:6 O’clock
8)Driving Scheme:1/64 Duty Cycle, 1/9 Bias
9)Power Supply Voltage:5.0 V
10)VLCD Adjustable For Best Contrast:9.0 V (VOP.)
11)Operation temperature:-20°C to +70°C
12)Storage temperature :-30°C to +80°C


Dimensions:




NOTE:



Some versions of this LCD are shipped with the PSB (parallel/serial select) pin shorted to VDD by a 0 ohm resistor fitted to R9 on the back of the LCD (see image above). This fixes the LCD in parallel mode. If this resistor is fitted and you wish to use the LCD in serial mode you will either need to move the resistor to R10 or completely remove it and ground the PSD pin.

Arduino Connections In Serial (SPI) Mode:

For Arduino Uno

MODULE..........................UNO
K (backlight cathode).........GND
A (backlight anode)..........+5V
PSD (SPI Mode).................GND (SEE NOTE)
E (SCK)..........................D13
R/W (MOSI)....................D11
RS (CS)..........................D10*
VDD.............................+5V
VSS..............................GND

For Arduino Mega

MODULE..........................MEGA
K (backlight cathode).........GND
A (backlight anode)..........+5V
PSD (SPI Mode).................GND (SEE NOTE)
E (SCK)..........................D52
R/W (MOSI)....................D51
RS (CS)..........................D53*
VDD.............................+5V
VSS..............................GND

*This pin is configured in software, see '#define CS_PIN 10' line in example sketch below.



Arduino Library:

This display is supported by our HCDisplay library. You can download the library from the software section of our support forum here:

viewtopic.php?f=58&t=2827



Arduino Example Sketch:

Code: [Select all] [Expand/Collapse]

1. /* FILE:    HCDisplay_Hello_World
2.    DATE:    20/12/18
3.    VERSION: 0.1
4.    AUTHOR:  Andrew Davies
5.    
6. 20/12/18 version 0.1: Original version
7.  
8. This is a simple sketch to demonstrates how to print text at specified locations
9. on the display. The sketch also shows how to change font style and
10. foreground/background colour. This sketch has been written to work with the
11. following module:
12.  
13. https://hobbycomponents.com/displays/285-12864b-parallel-serial-graphic-lcd-module
14.  
15. The library support both hardware as software serial interfaces for this display.
16. To use the hardware (SPI) interface connect the display to your UNO/NANO as follows:
17.  
18. MODULE..........................UNO
19. K (backlight cathode)...........GND
20. A (backlight anode).............+5V
21. PSD (SPI Mode)..................GND (SEE NOTE)
22. E (SCK).........................D13
23. R/W (MOSI)......................D11
24. RS (CS).........................D10*
25. VDD.............................+5V
26. VSS.............................GND
27.  
28. And initialise the library with the following function: HCDisplay.Init(10);
29.  
30. For software serial you can use any digital pin for E (SLK), R/W (MOSI), & RS (CS).
31. Initialise the library for software serial module with the following function:
32. HCDisplay.Init(RS PIN, E PIN, R/W PIN);
33.  
34. *Some versions of this LCD are shipped with the PSB (parallel/serial select) pin
35.  shorted to VDD by a 0 ohm resistor on the back of the display.
36.  
37. NOTE: TO USE THIS SKETCH YOU MUST FIRST SELECT THE VERSION OF DISPLAY YOU HAVE BY
38. UNCOMMENTING THE APPROPRIATE LINE IN THE OPTIONS.H FILE WHICH CAN BE FOUND IN THE
39. HCDISPLAY LIBRARY FOLDER. For windows users avoid using the Windows Notepad editor
40. as it doesn't format things properly.  
41.  
42. More information about this library can be found in the software section of our support
43. forum here:
44.  
45. http://forum.hobbycomponents.com/software
46.  
47.  
48. You may copy, alter and reuse this code in any way you like, but please leave
49. reference to HobbyComponents.com in your comments if you redistribute this code.
50. This software may not be used directly for the purpose of selling products that
51. directly compete with Hobby Components Ltd's own range of products.
52. THIS SOFTWARE IS PROVIDED "AS IS". HOBBY COMPONENTS MAKES NO WARRANTIES, WHETHER
53. EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
54. MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ACCURACY OR LACK OF NEGLIGENCE.
55. HOBBY COMPONENTS SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR ANY DAMAGES,
56. INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY
57. REASON WHATSOEVER.
58. */
59.  
60. #include "HCDisplay.h"
61.  
62. HCDisplay HCDisplay;    //Creates an instance of the HCDisplay library
63.  
64.  
65. /*******************************************************************************************************/
66. /**************************************** USER SETTINGS ************************************************/
67. /*******************************************************************************************************/
68.  
69. /* Arduino pins used to connect to the display and displays touch sensor */
70. #define RS      10        //Displays Chip Select pin
71. #define E       13        //Displays clock pin
72. #define RW      11        //Displays data pin
73.  
74. /*******************************************************************************************************/
75.  
76. unsigned int MaxX, MaxY;
77. boolean FGColour = 1;
78.  
79. void setup()
80. {
81.   HCDisplay.Init(RS);         //Initialise the display (hardware serial mode - faster but must use hardware SPI pins)
82.   //HCDisplay.Init(RS, E, RW); //Initialise the display (software serial mode - slower but can use any digital pins)
83.  
84.   /* Get the screens X & Y resolution */
85.   MaxX = HCDisplay.ResX() - 1;
86.   MaxY = HCDisplay.ResY() - 1;
87.  
88.   /* Draw a boarder */
89.   HCDisplay.Rect(0 , 0, MaxX, MaxY, OUTLINE, 1);
90.   HCDisplay.Rect(0 + 3 , 0 + 3, MaxX - 3, MaxY - 3, OUTLINE, 1);
91.  
92.   /* Print some text */
93.   HCDisplay.Pos(44,8);
94.   HCDisplay.Print("Hobby");
95.   HCDisplay.Pos(24,18);
96.   HCDisplay.Print("Components");
97.  
98.   HCDisplay.Pos(16,30);
99.   HCDisplay.Print("128 x 64 LCD");
100.  
101.   /* Change the font */
102.   HCDisplay.SetFont(MedProp_12ptFont);
103. }
104.  
105.  
106. void loop()
107. {
108.   /* Make some text flash by swapping the text foreground and background colours */
109.   HCDisplay.SetFG(FGColour);
110.   HCDisplay.SetBG(!FGColour);
111.   HCDisplay.Pos(10,42);
112.   HCDisplay.Print("HCMODU0032");
113.  
114.   FGColour = !FGColour;
115.  
116.   delay(200);
117. }

GeSHi © Codebox Plus Extension

Datasheet:

st7920.pdf

[sadCustomer]

I have bought this module and can not get it to work in serial mode. it is not the same as in the image above. 12864ZW instead of 12864B. i have owned a 12864B before and have wired this one exactly the same but can not get the 'hello world' from u8glib to work. any help would be appreciated.

[andrew]

We have checked our stocks and it would seem we have been supplied this variant without us knowing about it. However we have now connected one up and we can confirm that it works with the above sketch without modification. Could you elaborate on what you mean by when you say it doesn't work ? Do you see anything on the screen? Do you see a backlight? Have you tired using the sketch and library found in the first post of this forum? Please also reference the comments within this sketch for correct connection.

[sadCustomer]

the problem vas on my side. the module i had previously worked even on software SPI ports but this one works just on the hardware one. nice screen, great contrast.

[andrew]

Glad you managed to get it working.

[Justblair]

Just a quick question before i plug this in.

I can't find a datasheet for the module, but perhaps you will know the answer to this one.

Do I need a current limiting resistor for the backlight if I am using 5v? Looking at the display it already has 34ohm of ,limiting resistor there (R13 and R14 are 68ohm in Parallel), so i am guessing I don't need one?

[andrew]

That's right, you don't need a current limiting resistor when applying 5V to the backlight.

[Justblair]

Thanks. I kinda found out for myself.

What persuaded me to make the leap was when I found the solder jumpers that connect Vss and K, Vdd and A and PSB to Vss (or Vdd for parallel operation). Made sense that the Led accepted 5v if the jumpers are there.

I really think you should document the jumpers here, it is a selling point for the display. The contrast and brightness is superb on the display.

[alf_sito]

Hi good morning. I recently purchased a 12864B LCD (128 x 64 Dots Graphic Blue Color Backlight LCD Display Controller module ST7920). I followed this guide, both the Sketch as wiring. After reviewing several times, the screen lights up but shows no text. Besides connecting "PS (SPI Mode) to GNDFund" I short-circuits feeding. In fact I checked with multimeter that there is connection between PSB and VDD. As if to be ready for connection in parallel. Is there any need to remove the bridge? I would appreciate any help.

[andrew]

I have just pulled one of our current batch out of stock and it looks like the factory have fitted a zero ohm resistor to R9 which does indeed apply VDD to the PSB pin and therefore configuring the screen to parallel mode. To put the screen into serial mode it looks like you will need to either move the resistor to R10 which grounds the PSD pin, or completely remove the R9 resistor and ground the PSD pin yourself.

We will confirm this and update our information to include this variation of screen.