The GM12864-59N is a graphic LCD module with a resolution of 128x64 pixels, designed for displaying both text and graphics in embedded systems. This versatile display module is widely used in applications such as industrial control panels, handheld devices, and DIY electronics projects. It supports both SPI and parallel communication protocols, making it compatible with a variety of microcontrollers and development boards.
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This circuit is an emergency alert system that uses a NUCLEO-F072RB microcontroller to send SMS alerts and make calls via a SIM800L GSM module, while obtaining location data from a GPS NEO 6M module. The system is powered by a Li-ion battery and includes a TP4056 module for battery charging and protection, with a rocker switch to control power to the microcontroller.
This circuit is designed for communication and location tracking purposes. It features an Arduino Nano interfaced with a SIM800L GSM module for cellular connectivity, a GPS NEO 6M module for obtaining geographical coordinates, and an AITrip ADXL335 GY-61 accelerometer for motion sensing. The LM2596 Step Down Module is used to regulate the power supply to the components.
The circuit consists of two rotary encoders (Kalamoyi P3022-V1-CW360) connected to two STG adapters. Each encoder's VCC, OUT, and GND pins are connected to the corresponding STG adapter, facilitating signal transmission and power supply management.
This circuit features a LilyGo-SIM7000G module for cellular communication and GPS functionality, interfaced with an RTC DS3231 for real-time clock capabilities. It includes voltage sensing through two voltage sensor modules, and uses an 8-channel opto-coupler for isolating different parts of the circuit. Power management is handled by a buck converter connected to a DC power source and batteries, with a fuse for protection and a rocker switch for on/off control. Additionally, there's an LED for indication purposes.
Industrial control systems for displaying real-time data
Handheld devices requiring graphical user interfaces
DIY electronics projects and prototyping
Embedded systems with text and graphical display needs
Home automation systems for status monitoring
Technical Specifications
The GM12864-59N is a robust and reliable display module with the following key specifications:
Parameter
Value
Display Resolution
128x64 pixels
Operating Voltage
5V DC
Communication Protocols
SPI or Parallel
Backlight
LED (white or blue)
Operating Temperature
-20°C to +70°C
Storage Temperature
-30°C to +80°C
Dimensions
93mm x 70mm x 13mm
Viewing Area
72mm x 40mm
Controller IC
ST7920 or equivalent
Pin Configuration and Descriptions
The GM12864-59N has a 20-pin interface. The pin configuration is as follows:
Pin Number
Pin Name
Description
1
VSS
Ground (0V)
2
VDD
Power supply (5V)
3
VO
Contrast adjustment (connect to a potentiometer)
4
RS
Register Select (Command/Data selection)
5
R/W
Read/Write control (High for Read, Low for Write)
6
E
Enable signal (used to latch data)
7-14
DB0-DB7
Data bus lines (used in parallel mode)
15
PSB
Interface selection (High for Parallel, Low for SPI)
16
NC
No connection (leave unconnected)
17
RST
Reset signal (active low)
18
VOUT
Voltage output for internal use (connect to a capacitor for stability)
19
BLA
Backlight anode (connect to 5V via a current-limiting resistor)
20
BLK
Backlight cathode (connect to ground)
Usage Instructions
How to Use the GM12864-59N in a Circuit
Power Supply: Connect the VDD pin to a 5V power source and the VSS pin to ground.
Contrast Adjustment: Connect the VO pin to the wiper of a 10kΩ potentiometer. Connect one end of the potentiometer to VDD and the other to VSS. Adjust the potentiometer to set the display contrast.
Communication Mode: Use the PSB pin to select the communication protocol:
High (5V): Parallel mode
Low (0V): SPI mode
Backlight: Connect the BLA pin to 5V through a suitable current-limiting resistor (e.g., 220Ω). Connect the BLK pin to ground.
Microcontroller Interface: Connect the data and control pins (RS, R/W, E, DB0-DB7 for parallel mode or RS, R/W, E for SPI mode) to the corresponding pins on your microcontroller.
Important Considerations and Best Practices
Ensure the power supply is stable and within the specified range (5V ±5%).
Use decoupling capacitors (e.g., 0.1µF) near the power pins to reduce noise.
For SPI mode, ensure the PSB pin is tied to ground and unused data pins (DB0-DB7) are left unconnected.
Avoid excessive backlight current to prevent overheating. Use a resistor to limit the current.
Handle the module carefully to avoid damaging the LCD glass or flex cable.
Example: Connecting to an Arduino UNO (SPI Mode)
Below is an example of how to connect and program the GM12864-59N in SPI mode with an Arduino UNO:
Wiring Diagram
GM12864-59N Pin
Arduino UNO Pin
VSS
GND
VDD
5V
VO
Potentiometer (middle pin)
RS
Pin 9
R/W
GND
E
Pin 10
PSB
GND
RST
Pin 8
BLA
5V (via 220Ω resistor)
BLK
GND
Arduino Code
#include <U8g2lib.h>
// Initialize the display in SPI mode
U8G2_ST7920_128X64_F_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11,
/* cs=*/ 10, /* reset=*/ 8);
void setup() {
u8g2.begin(); // Initialize the display
}
void loop() {
u8g2.clearBuffer(); // Clear the display buffer
u8g2.setFont(u8g2_font_ncenB08_tr); // Set font
u8g2.drawStr(0, 10, "Hello, GM12864!"); // Draw text
u8g2.sendBuffer(); // Send buffer to display
delay(1000); // Wait for 1 second
}
Troubleshooting and FAQs
Common Issues and Solutions
No Display Output:
Verify the power connections (VDD and VSS).
Check the contrast adjustment (VO pin and potentiometer).
Ensure the backlight is properly connected.
Flickering or Unstable Display:
Add decoupling capacitors (e.g., 0.1µF) near the power pins.
Verify the communication protocol selection (PSB pin).
Incorrect or Garbled Text/Graphics:
Check the wiring of the data and control pins.
Ensure the microcontroller code matches the selected communication protocol.
Backlight Not Working:
Verify the current-limiting resistor value.
Check the BLA and BLK connections.
FAQs
Q: Can I use the GM12864-59N with a 3.3V microcontroller?
A: Yes, but you will need a level shifter to convert the 3.3V logic signals to 5V.
Q: What is the typical current consumption of the module?
A: The module typically consumes around 20-30mA, excluding the backlight.
Q: Can I use the module in bright sunlight?
A: The GM12864-59N is not sunlight-readable. For outdoor use, consider a display with higher brightness or contrast.
Q: How do I clean the display surface?
A: Use a soft, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
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