2x40 lcd module free sample

Newhaven 40x2 character Liquid Crystal Display shows characters with dark pixels on a bright yellow/green background when powered on. This transflective LCD Display is visible with ambient light or a backlight while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-0240AZ-FL-GBW display has an optimal view of 6:00. This display operates at 5V supply voltage and is RoHS compliant.

Newhaven 40x2 character Liquid Crystal Display shows characters with dark pixels on a bright yellow/green background when powered on. This transflective LCD Display is visible with ambient light or a backlight while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-0240AZ-FL-YBW display has an optimal view of 6:00. This display operates at 5V supply voltage and is RoHS compliant.

If you need to display a lot of information on your device, this extra wide LCD will do the job with an active area of 5.8-inches (147.50 millimeters). Like all transflective displays, the 5x8 character matrix on this 40 x 2 LCD screen can be read in direct sunlight, is good for typical office lighting, and is easy to read in dark locations. One of our customers bought a display in the CFAH4002A series to use in an environmental control system for irrigation management.

Our goal is to keep every product available as long as possible. We"ve sold the CFAH4002A series since 2008 and it is still going strong. With a white LED backlight, this FSTN (Film compensated Super-Twisted Neumatic) display module has a higher contrast ratio than the standard STN, resulting in superior sharpness and contrast. A simple current limiting resistor in line with the voltage source works well in most applications. The white LEDs do not demand a current source, although one may be used. For details, see the backlight section starting on page 22 of the datasheet.

ERM4002DNS-1 is 40 characters wide,2 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with white color included can be dimmed easily with a resistor or PWM,ffstn-lcd negative,white text on the black color,high contrast,wide operating temperature range,wide view angle,rohs compliant,built in character set supports English/Japanese text, see the SPLC780C datasheet for the full character set. It"s optional for pin header connection,5V or 3.3V power supply and I2C adapter board for arduino.

Liquid crystal displays (LCD) come in two main types that are of interest to hobby and DIY makers; Character LCD displays and pixel / graphic LCD displays. This intro “How To” will be covering the more popular and less expensive character LCD displays based on the very common Hitachi HD44780 controller.

LCD displays come in many sizes most often named by the number of rows and then the length of the display line. For example a 1x16 LCD display will have one row of sixteen characters and a 4x20 LCD display will have four rows with twenty characters in each.

LCDs can be have backlighting or be reflective (think calculator). In either case the programming that goes into working these displays is the same. LCDs with backlight normally use two pins to provide power to the backlighting.

2x16 character LCD with backlighting. Note, screen is all black, but to display characters the crystals move to allow the backlighting to show through.

Most LCDs that are being made now come with one row of sixteen pins. The first fourteen pins are used to control the display and the last two are for the backlighting (if the display has backlighting).

Older LCDs sometimes came with two rows of seven making a fourteen pin connector. These fourteen pins, most often, have the same signals on them that the 1x16 pin displays do. For example, pin #1 on the 2x7 connector is the same signal as pin #1 on the 1x16 connector, they are just arranged differently. If you have a 2x7 pin display but need to connect it to a 1x14 (1x16) backpack or device, the basic

LCDs based on the Hitachi HD44780 controller must be initialized after they are powered-up. The reason that the LCDs must be initialized is because there are a few critical options that the display must “know” before it can work or communicated properly.

The most import of which is wether to use an eight or four bit data interface. Hitachi and compatible LCDs can be set to use either 8 or 4 of the data pins to communicate with the host controller that is driving it. Using a four pin data bus lets you save on pins, but your controller must divide each instruction into two four bit segments and then send them one at a time to the display. So the trade off is less pins versus more programming and slower communication. (The reduced speed of having to send data twice has little effect on the display, but it does busy your processor for a longer amount of time.)

When you send the LCD a character to display, you are not actually sending it to the screen part of the display, but rather a memory location that the display uses to know what to display on the screen. The problem here is that the memory location and the mapping to positions on the screen are not always sequential.

The “Hello World” example above is often what gives people trouble using a 1x16 LCD for the first time. Here the “r” “l” “d” went into memory address 0x88,0x89 and 0x8A which are not visible on this display !

When it is actually time to use an LCD you have a few choices of how to do it. You can connect it directly to your Arduino or micro-controller (MCU) and use a lot of pins and wires or your could use a backpack.

Using a backpack has a few advantages over connecting the LCD directly to your micro-processor. Besides using less wires, (and pins) some backpacks take over the entire job of driving the display. All your code has to do is send the text out of the appropriate interface, I2C, serial, SPI etc ... This can save your micro-controller a lot of memory, and processor time. And, it also lets you get your projects working sooner, since you do not have to code and debug software to drive the display on top of the rest of your project.

B. Backpacks that reduce the pin-out burden on your MCU. With this type of backpack, your MCU still initializes and drives the LCD, but through an interface with fewer wires.

The LCD Functions are intended for easy interfacing between C programs and alphanumeric LCD modules built with the Hitachi HD44780 controller or equivalent. The prototypes for these functions are placed in the file alcd.h, located in the .\INC subdirectory. This file must be #include -d before using the functions. For LCD modules that use the Samsung KS0073 controller the alcd_ks0073.h header file must be used. The LCD functions do support both the XMEGA and non-XMEGA chips. The following LCD formats are supported in alcd.h: 1x8, 2x12, 3x12, 1x16, 2x16, 2x20, 4x20, 2x24 and 2x40 characters. The allocation of LCD module signals to the I/O ports must be specified in the Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu. The LCD power supply and contrast control voltage must also be connected according to the module data sheet. The low level LCD Functions are: void _lcd_write_data(unsigned char data) writes the byte data to the LCD instruction register. This function may be used for modifying the LCD configuration. Example: /* enables the displaying of the cursor */ _lcd_write_data(0xe); void lcd_write_byte(unsigned char addr, unsigned char data); writes a byte to the LCD character generator or display RAM. Example: /* LCD user defined characters Chip: ATmega8515 Memory Model: SMALL Data Stack Size: 128 bytes Use an 2x16 alphanumeric LCD connected to the STK600 PORTC header as follows: [LCD] 1 GND2 +5V3 VLC4 RS 5 RD 6 EN 11 D4 12 D5 13 D6 14 D7 [STK600 PORTC HEADER] 9 GND 10 VCC LCD HEADER Vo 1 PC0 2 PC1 3 PC2 5 PC4 6 PC5 7 PC6 8 PC7

The connections must be specified in the Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu */ /* include the LCD driver routines */ #include

typedef unsigned char byte; /* table for the user defined character arrow that points to the top right corner */ flash byte char0[8]={ 0b10000000, 0b10001111, 0b10000011, 0b10000101, 0b10001001, 0b10010000, 0b10100000, 0b11000000}; /* function used to define user characters */ void define_char(byte flash *pc,byte char_code) { byte i,a; a=(char_code<<3) | 0x40; for (i=0; i<8; i++) lcd_write_byte(a++,*pc++); } void main(void) { /* initialize the LCD for 2 lines & 16 columns */ lcd_init(16); /* define user character 0 */ define_char(char0,0); /* switch to writing in Display RAM */ lcd_gotoxy(0,0); lcd_putsf("User char 0:"); /* display used defined char 0 */ lcd_putchar(0); while (1); /* loop forever */ } unsigned char lcd_read_byte(unsigned char addr); reads a byte from the LCD character generator or display RAM. The high level LCD Functions are: void char lcd_init(unsigned char lcd_columns) initializes the LCD module, clears the display and sets the printing character position at row 0 and column 0. The numbers of columns of the LCD must be specified (e.g. 16). No cursor is displayed. This is the first function that must be called before using the other high level LCD Functions. void lcd_clear(void) clears the LCD and sets the printing character position at row 0 and column 0. void lcd_gotoxy(unsigned char x, unsigned char y) sets the current display position at column x and row y. The row and column numbering starts from 0.

void lcd_putchar(char c) displays the character c at the current display position. void lcd_puts(char *str) displays at the current display position the string str, located in RAM. void lcd_putsf(char flash *str) displays at the current display position the string str, located in FLASH. void lcd_putse(char eeprom *str) displays at the current display position the string str, located in EEPROM.

Character LCDs are available for few money in many different variants, most of them comply to the HD44780 industrial standard from Hitachi. Regardless of the number of provided characters (2x16, 2x20, 4x16, 4x20, 2x40), they are communicating over the same bus interface with the core. But note, that the supported display types depend on the firmware or MIOS application. For instance, if you connect a 2x20 characters display to the MIDIbox64, the 2x4 field at the right side will stay blank. MIOS applications are mostly more flexible and allow you to customize the screen by enhancing the source code, therefore a general statement - which LCD is the best for your MIDIbox - cannot be given here. Please search on the project pages for more informations regarding the supported display sizes or ask in the MIDIbox forum if you are unsure.

Availability:At every good sorted electronic store and especially at EBay (search for 2x16 lcd or similar). Order numbers for Reichelt: LCD 162C LED (2x16 with backlight, 12.70 EUR), LCD 164A LED (4x16 with backlight, 20.90 EUR), LCD 202A LED (2x20 with backlight, 13.10 EUR), LCD 204A LED (4x20 with backlight, 27.20 EUR)

MIOS8 Connectivity: During the design phase of the core module I took focus on easy soldering and tried to place as less bridges as possible on the board. As an side effect, the pin assignments of the LCD interface J15 unfortunately aren"t 1:1. So, you have to take special care for the interconnections.

Following schematic show, how to connect a LCD 162C display from Displaytech to the interface. Please note, that the pin assignments are different on some other displays! Sometimes the pins are mirrored, sometimes the backlight pads are on another place. Fortunately the order of the bus pins is the same on every display! So, before you buy one, try also to get a datasheet from the display: consult www.google.com, keywords: "displayname datasheet".

If a PIC18F4685 is used in the project (-> MIDIbox SID V2), the LCD is accessed in 4bit mode. Accordingly, the data pins D0/D1/D2 and D3 should be left open at core and LCD side (don"t connect them to ground!) - see mbhp_lcd_4bit_mios8.pdf

Following schematic shows, how to connect a LCD 162C display from Displaytech to the interface. Please note, that the pin assignments are different on some other displays! Sometimes the pins are mirrored, sometimes the backlight pads are on another place. Fortunately the order of the bus pins is the same on every display! So, before you buy one, try also to get a datasheet from the display: consult www.google.com, keywords: "displayname datasheet".

(*) it"s 1:1 and mirrored to simplify the cabling of common 2x40 displays (and partly due to historical reasons - it"s originated from the so called "UltraPCB").

Two character LCDs are natively supported by MIOS, but only two applications are using this option yet: MIDIbox LC and MIDIbox SEQ. However, people with programming skills are free to add this option also to their own MIOS application (the second display can be addressed by adding 0x80 to the cursor position).

MIOS8 Connectivity: Both displays have to be connected to the same data and control pins at J15, only the E (enable) input of the second LCD requires a dedicated output (pin C.4, J10:RC) which is not routed to J15 and therefore has to be soldered directly to the core module.

MIOS32 Connectivity: the MBHP_CORE_STM32 and MBHP_CORE_LPC17 module provides two LCD ports (J15A and J15B) where displays can be directly plugged in without the need for an adapter cable.

MIOS8: A special driver module is available which allows to connect up to 8 CLCDs to a single core (clcd_multi). Displays have to be selected with the USER_LCD_Select function by the application.

Connectivity: any free pin of the PIC can be used for the enable line. For instance, if your application doesn"t use the analog pins at J5 of the core module, you are able to connect 8 additional LCDs. You could also program a multiplexer interface in order to address even more LCDs by routing the enable line to one PIC pin.

MIOS32: the standard CLCD driver is prepared for controlling up to 256 devices selected via MIOS32_LCD_DeviceSet(). Please understand this value as a theoretical possibility, physical parameters (like cable capacities) have to be considered as well. ;-)

These modern character LCDs are easy to mount on a PCB, and faster than HD44780 based displays, although they are almost compatible. A special configuration sequence is required, which is provided by the driver module under modules/app_lcd/dog.

GLCDs which are KS0107/KS0108 or HD61202 compatible are the preferred displays when using the graphic LCD option of MIOS8 (for MIOS32 the access performance doesn"t matter). GLCDs are handled like character LCDs, that means that you can use the same MIOS_LCD_* functions to set the cursor and to print characters, strings and values. By default 5x8 characters are used, but you are also able to change the font in order to print bigger or smaller characters, icons or pictures.

MIOS8 Connectivity: the bus interface is similar to a character based LCD, but every 64x64 segment needs a CS (chip select) line. Since these lines are gated through the E (enable) pin, it was possible to share the CS lines with other PIC outputs. The MIOS driver takes care for possible conflicts.

All graphical LCDs require a negative voltage to drive the Liquid Crystal cells. Some LCDs provide an inbuild DC converter, some others not. The schematic below shows a MAX759 voltage converter which can be used if a Vout pin is not provided by the GLCD.

MIOS32 Connectivity: the bus interface is similar to a character based LCD, but every 64x64 segment needs a CS (chip select) line which is available at J28 (MBHP_CORE_STM32: J5C).

All graphical LCDs require a negative voltage to drive the Liquid Crystal cells. Some LCDs provide an inbuild DC converter, some others not. The schematic below shows a MAX759 voltage converter which can be used if a Vout pin is not provided by the GLCD.

Please note that not every SED1520 based GLCD at Pollin is recommendable. E.g. the "LCD Datavision DG-12232" didn"t work at my side. It would also need a negative display voltage and 50V AC (!) to supply the EL backlight - forget this display! ;-)

MIOS32 Connectivity: the bus interface is similar to a character based LCD, but every 61x32 segment needs a CS (chip select) line which is available at J28 (MBHP_CORE_STM32: J5C).

T6963C based displays are cheap and popular, but the performance is extreme poor compared to KS0108 which has been introduced above, therefore the use of such displays is not recommended for MIOS8, although a "custom driver" is provided. The driver ensures that the display can be accessed in the same way like a KS0108 based LCD, but since the pixel information is stored in the horizontal direction, MIOS has to rotate every character, icon and picture by 90 degress. And it has to take care that only the shape of the character will be overwritten (-> in worst case two Read-Modify-Write transfers have to be performed for every 8-bit word). This means, that 2*5*8 = 80 bus accesses are required to print a 5x8 character!

All graphical LCDs require a negative voltage to drive the Liquid Crystal cells. Some LCDs provide an inbuild DC converter, some others not. The schematic below shows a MAX759 voltage converter which can be used if a Vout pin is not provided by the GLCD.

MIOS32: the situation is much more relaxed for MIOS32, as the driver uses an internal graphical buffer to avoid read-modify-write accesses. And thanks to the capability of RTOS to run the LCD output task at low priority, the performance of higher priority tasks (such as MIDI receiver) is not affected! :-)

PCD8544 LCDs are very small and providing only a resolution of 84x48. But they are connected via a serial interface with a small number of wires to the MIOS core, therefore up to 8 LCDs can be handled by the driver w/o performance loss. It"s possible to use three of the displays as KS0108 replacement for MIDIbox LC, but you can also use it with any other MIDIbox --- also a completely new designed MIDIbox application could be programmed which gets use of all 8 displays (e.g. for 8 control channels) --- but please keep in mind, that due to the low resolution only 14x6 characters are displayed by default. A smaller font could be used to display 21 or 28 characters per line, but the appr. program modifications won"t be supported from my side (you have to write the appr. code into the application by yourself).

IMPORTANT: please power-cycle the MBHP_CORE_LPC17 module whenever the lcd_type has been changed, otherwise the GLCD won"t be initialized correctly (it has to be reset!)

IMPORTANT: please power-cycle the MBHP_CORE_LPC17 module whenever the lcd_type has been changed, otherwise the GLCD won"t be initialized correctly (it has to be reset!)

MIOS8: since MIOS V1.3 it is possible to integrate a custom LCD driver into the application. This allows programmers to write low-level drivers not only for GLCDs, but also for IIC or LED digit displays, without "touching" the operating system. And they are able to use the same MIOS_LCD_* functions like for other displays.

Two examples are already mentioned above - the T6963C driver has been removed from the main MIOS8 release and is now available as separate driver (module/app_lcd/app_lcd.inc) which can be linked into every application.

Another example is given with the IIC driver which accesses Magic Orbital LCDs via the IIC interface. This interface is normaly used by the BankStick, but can also be used to access other IIC devices (all IIC devices are connected to port CORE:J4 in parallel like shown in this schematic.

MIOS32: each LCD has a separate driver which is selelected from the Makefile with an environment variable: modules/app_lcd/$MIOS32_LCD - the source code of all drivers is stored in the repository. The "universal" driver is used by default (to developers: "export MIOS32_LCD=universal") and allows to select the most favourite LCDs during boot phase (and runtime). Users would typically specify the LCD type and dimensions with the bootloader update application which is available in the MIOS 32 download section.

The EA 9707-V24S interface allows dot-matrix LCDs to be programmed easily and quickly. The interface can be soldered directly onto almost all dot-matrix modules. It is connected to a standard RS-232C interface.