![]() * PSB must be connected to GND and RS(CS) and RESET must be connected to 1. * only two wires are required for the serial interface of the ST7920: RW and E */ #elif (LCD_INTERFACE_MODE = MODE_7920_SERIAL) || (LCD_INTERFACE_MODE = MODE_1803_SERIAL) #endif /* PROCESSOR_TYP for the I2C Interface */ #define LCD_I2C_ADDR 0x3C /* SSD1306 controller defines 0x3c or 0x3d (SA0=1) as address */ * only two wires are required for the I2C interface: SCL and SDA */ #endif /* PROCESSOR_TYP for SPI Interface*/ The board accommodates the ATmega2560 microcontroller, which operates at a frequency of 16 MHz. the default connection of LCD for chinese version from Fish8840, weiweitm SKU: A000067 Description Arduino Mega 2560 is an exemplary development board dedicated for building extensive applications as compared to other maker boards by Arduino. alternative connection of graphical LCD alternative connection of graphical LCD for the chinese T5 board * command / data switch 0=command 1=data */ Port pin for external Voltage measurement (zener voltage extension) PC3 # default for mega8, mega168 and mega328 # for mega1280, mega2560 port F is the Analog input you must set WITH_VEXT, if you wish external voltage reading Port pin with >100nF capacitor for calibration, -1 for none Port pin for Battery voltage measuring Port pin for 2.5V precision reference used for VCC check (optional) The pin number gives the right MUX2:0 setting Port pin for external Voltage measurement (zener voltage extension) # for m324, m644, m1284 port A is the Analog input The TPext can be used with a 10:1 resistor divider as external voltage probe up to 50V You can divide large jobs up across 2 or more 328 chips, every chip adds a core. When your project is done, you still have your Dev Board to pop a new bootloaded 328 in and do the next thing. That is why the Uno is called a Development Board. The TPREF pin can be connected with a 2.5V precision voltage reference That is stated in more words on the Arduino site. Please don't change the definitions of TP1, TP2 and TP3! The lower pins of this Port must be used for measurements. This Port must have an ADC-Input (ATmega8: PORTC). * Definition for the Port, that is directly connected to the probes. #define MODE_1803_SERIAL 7 /* serial interface for SSD1803 */ #define MODE_7108_SERIAL 6 /* serial interface for ST7108 with shift register 74HC164 */ #define MODE_7920_SERIAL 5 /* serial interface for ST7920 */ #define MODE_SPI 4 /* 4 bit SPI interface for ST7565 or SSD1306 */ ![]() #define MODE_3LINE 3 /* special 3 line serial output with Data/Command as first data bit PCF8814 */ #define MODE_I2C 2 /* I2C interface for SSD1306 */ #define MODE_PARALLEL 1 /* default 4-Bit parallel mode for character LCD */ #define DebugOut 11 // if set, output of load time (ReadCapacity) in row 3 for C at pins 1+3 #define DebugOut 10 // if set, output of capacity measurements (ReadCapacity) in row 3+4 #define DebugOut 5 // if set, output of Transistor checks in row 2+3 ![]() ![]() #define DebugOut 4 // if set, output of voltages of Diode measurement in row 3+4 #define DebugOut 3 // if set, output of voltages of resistor measurements in row 2,3,4 The nice thing about the hd44780 library is that it will autodetect the I2C address and the I2C backpack to LCD pin mapping.Thanks. There are examples to show how to use the library. The class that you want to use is the hd44780_I2Cexp class. Select and install the hd44780 library by Bill Perry. Go to Library Manager (in the IDE menus, Sketch, Include Libraries, Manage Libraries) and in the Topics dropdown choose Display and in the Filter your search box enter hd44780. The library is available in the Library Manager. The hd44780 library is the best available for I2C LCDs. Like Railroader said, the hd44780 library will make using the displays easier. Shorting a pad changes the base address by pulling that pin LOW. The base address (no pads soldered) is either 0x27 (range 0x20-0x27) or 0x3f (range 0x38-0x3f). Some of the backpacks have a set of solder pads that you can use to set the address (see image). The hd44780 I2C modules have an I2C expander chip on them. ![]() 2x16 and 4x20 character LCDs based on the hd44780 driver chips and many different graphic LCDs. To start with, which LCDs? There are several kinds. ![]()
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