graphic lcd display programming for sale

Can you control the backlighting by using PWM on the backlight voltage pin? It"s connected to Vss by default which applies the entire 5v to the pin, but if I can PWM the pin and apply a lower voltage will that dim the display? In essence I"m looking for a way to dim the display using an MCU. Also, when dimmed does it draw less current? (I"m thinking it does, less photons means less work which means less current).

Also, I"m assuming that a lot of current is most likely drawn from that backlight pin so I plan on placing a transistor between the MCU and the LCD which I will drive from the MCU via PWM.

Thanks for sharing your library. I ported it to the XMEGA style and it worked except that I need to add a reset in lcd_init(). I initialized the control port with RESET low, and then I promptly set it high.

The current version of this graphic display (GDM12864H) has a unique feature that I have not seen in any other 128x64 graphic LCD. Its pixels (and pitch) are square (0.39x0.39mm) so your circles appear as circles -- no more ellipses!!!

Thanks for posting. Please explain why you have 2K ohm connected to the V0 and VEE pins? This LCD has built-in DC converter to drive the LCD already?

Someone noted above that the voltage needs to be fairly low (~-4V) to see the darkness of the pixels. If you hook a pot up, be sure to wipe it to both extremes to see if you can atleast see a big black box when the LCD has power, then you know atleast your contrast works and you"re getting power!

astromme - I am currently working on a project with this serial graphic display and I am interested in using the MSP430 could I get a copy of the adapted Arduino ks0108 library? Thank you, this would be greatly appreciated.

You should look on the product page"s documents. There"s links to get it working with an Arduino microcontroller. Also, there is an article on Arduino if you did an online search with example code and a hookup guide => http://playground.arduino.cc/Code/GLCDks0108.

I recently bought this LCD to use with a Maple Mini board. What Library should I use with it? I found the KS0108 Graphics LCD library on the Arduino page. That seems to be more useful than the LiquidCrystal library which doesn"t seem to work with this 20-pin LCD.

The one i ordered off sparkfun nearly a month ago was of the " small fraction of the glcds out there will need a reset pulse" variety? it took me a few days and several hours to realize, i had to waste another pin. The solution was to go into the library and un-comment part of the code as described at the bottom http://www.arduino.cc/playground/Code/GLCDks0108/

I"m looking for a similar specs LCD, but with a white or blue backlight.. I"m planning on adding it next to my motorcycle OEM screen, and being green would quite likely be an ugly mismatch.

Make sure that you have a 100 to 330 ohm resister in series with the LCD backlight. Some of the documentation is not clear on this, but the resister must be there or the LED backlight will act like a dead short as soon as the voltage rises above the LED forward bias - usually about 2.0V.

So, stupid question, the LCD screen says it needs 9V to work. Is that supplied by the circuits on the board, or do you need to create a step-up dc converter to change 5V into 9V?

While the microcontroller was running, i had to take the display off my test board, because (stupid as i was) i mounted the V0 pot-meter under it. When i connected it back it was working!

On the page Csloser links to, he recommends a pull down resistor. Could anyone comment on the importance of this? Could this be the cause of my one line LCD?

I grabbed the software and loaded it. The backlight works and at first I saw a few lines on the display itself (these faded). When I ran the software from that web page, nothing came out on the display. I played with the contrast potentiometer a little, but I still see nothing. The program is running (I added some Serial output for debugging).

I forgot to mention that the LCD voltage, in my experience, should be around -4V for the display to be readable. Close to -5V will turn all of the pixels fully on and above -3V they will be totally transparent. Other units may behave differently but this is how mine works.

I intended to drive this LCD with an ATmega168, which now appears to be an astonishingly bad idea if the uC has only 1K RAM and you need that to drive the LCD. True? Or am I missing something completely obvious to the non-novice? It looks like I need a separate uC (like the DiosPro) to drive the LCD, with the 168 uC controlling the DiosPro via the UART? Happy to take advice....

You don"t have to devote any ATmega168 RAM to the LCD. This component has its own video RAM, one bit per pixel, 512 bytes total. I think you have to write whole bytes at a time (8 pixels), and it doesn"t know how to draw a letter "A" by itself, but the App Note from Kronos Robotics says they have a higher-level Dios library to deal with such operations.

This is an extremely low-power 128x64 graphic LCD display module. It has an integrated white LED backlight that illuminates the display easily in low-light conditions. This display is perfectly suited for hand-held or any application requiring low-power or a very a thin display. It has an integrated controller and the FFC tail is designed to mate with standard 18-conductor 0.5mm pitch ZIF connectors (typical would be Omron XF2L18351A/ DigiKey P/N OR754CT-ND).

iCA05 - Graphic LCD Development Kit is come with complete set of tools that fulfilled any type of applications (Simple Oscilloscope, Signal Monitoring, Chart Display, etc..). With the external GLCD port, user can easily mount the GLCD at the casing. Also iBoard includes analog ports for sensor input (Temperature, Light, Voltage) with the connections to PIC pins.

In this tutorial Tony Goodhew explains how to use the basic graphics procedures which are included in the display driver, and for the ambitious makers out there he also provides examples for advanced shapes and graphics!

All the other graphical and text objects we would like to display can be built from this single pixel instruction; such as lines, circles, rectangles, triangles and text strings at different sizes.

This is all carried out with code. Display manufacturers usually supply some of these procedures/methods but leave the rest up to the end user to construct.

The third line here imports the Framebuffer library which includes several very useful routines to draw objects on the display. The garbage collection library, gc, has also been imported so that we can check how much memory is available.

The following methods draw shapes (such as those above) onto the FrameBuffer. They only become visible to the user once the lcd.show() instruction is executed.

Each program contains the screen driver code, sets up the buttons/joystick (if applicable), sets the width and height variables, loads the essential libraries, defines the colour (R, G, B) and clear (c) procedures, then displays some colour checking text like this:

Using lcd.fill_rect, fill the whole screen green and then fill the middle of the screen black, leaving a 10 pixel border. Put red 10-pixel squares in each corner.

Draw a dark grey rectangle in the centre of the screen. Draw 500 white pixels inside the square, none touching the edge. (Random was explained in the previous display tutorial.)

We"ve provided some optimised extended graphics example programs to drive some of the popular boards here. Download the file for your board then read on (rename the files if your download adds weird characters at the end):

This is routine is very complicated. It splits the original triangle into two with a horizontal line and then fills them in. If you uncomment all the # lcd.show() lines and sleep instructions it will slow right down and you can see it working (unfortunately, the 2” display needs such a large buffer that there is not enough memory for the filled triangles code):

For the imports we added the math library as this is needed for Sin and Cos in graph plotting. The random library has also been imported, for the randomly generated triangles. These are followed by the basic LCD board setup we covered earlier.

In the centre of the screen display a ‘bull’s eye’ circular target with a ‘gold’ centre, 4 other colours and scores 10, 8, 6, 4 and 2 written in the appropriate positions.

You may have noticed that on some screens the text is very small and difficult to read. In a following tutorial will add an extra font, with more characters, which we can display in different sizes.

This article was written by Tony Goodhew. Tony is a retired teacher of computing who starting writing code back in 1968 when it was called programming - he started with FORTRAN IV on an IBM 1130! An active Raspberry Pi community member, his main interests now are coding in MicroPython, travelling and photography.

The new line of 3.5” TFT displays with IPS technology is now available! Three touchscreen options are available: capacitive, resistive, or without a touchscreen.

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DISPLAY VISIONS (before: ELECTRONIC ASSEMBLY) is THE manufacturer for high quality industrial displays. See here where and how these displays are developed and manufactured.

Before you get involved with LCD display programming, its critical you first choose the correct LCD display for your product. All LCD modules can be classified into one of two categories: those requiring a controller/driver chip and those that don"t.

Displays requiring a controller/driver chip to interface with your product require a programmer to write software code, sometimes referred to as firmware, to connect the LCD to the end product. Those that have a controller/driver are much easier and faster to program. Specifically, this article will address programming the character or alphanumeric displays with a parallel bus (a parallel bus LCD sends and receives 4 bits, 8 bits or 16 bits of data at a time).

The second category, those that don"t require a controller/driver chip, are called static or segment displays. This means that there is one connection on the LCD for each segment. Although this eliminates the controller chip, it requires a great deal of connections between the display and the customers product.

So what exactly is this all important piece of technology—the controller/driver (C/D)—that will make your life easier through quick and simple programming? It is a small microprocessor whose function is to convert the designers’ firmware/software into characters, numbers, and punctuation marks. The C/D makes it easy for the product designer to quickly program the character display. Inside each C/D is a character table, sometimes referred to as a character map or font table, which contains pre-loaded letters, numbers, and punctuation. The table allows the designer to call out the requested character by addressing the number of that character. In other words, the letter ‘T’ may be the number 27 and the n-dash (i.e. “-”) could be number 122. This eliminates the need to create each character from scratch and reduces the amount of time necessary to program the LCD module. In the font table shown below, the letter ‘P’ would be displayed when the designer calls the number sequence below.

D0=0, D1=0, D2=0, D3=0, D4 =0, D5=0, D6=1, D7=1. The letter Do, D1 and so on above means data bit 0, data bit 1 etc. Most character displays use eight data bits.

The character table contains 255 possible characters. This number of characters is sufficient for one language, but would be impossible to display every character in every language when limited to only 255 options. This challenge is solved by making use of a different C/D for each language. You can order a C/D for French, German and many other languages.

Character LCD displays contain 14 pins if no backlight is attached and 16 pins when an EL or LED backlight is included with the module. Below is a breakdown of each pin and the function of that pin. The function of these pins directly relates to your success at programming character LCD displays, so pay attention!

The Ground is necessary for the voltage and the contrast adjust to reference. Ground, also referred to as zero volts, is required on all electronic devices. Electrical ground is similar to the ground floor of a tall building. All the floors above the ground floor are positive and all the floors below the ground floor, the basement, are negative. The ground pin on the LCD is connected to the ground on the customer’s product

This is the Logic voltage necessary to drive the LCD. There are two common voltages for a character LCD, 3.3V (this is equal to two "aa" batteries in series) and 5V.

It is possible to order a character LCD with both a positive and negative voltage. This option is not very common and is seen in replacing older discontinued displays.

We do not recommend using the same Ground and VDD connections to supply both your LCD logic and your LED backlight. It is better to use a separate power for your backlight which is what pins 15 and 16 or the A and K tab on the side of the LCD are designed for.

Register Select has two positions: 1 (on or high) or 0 (off or low). When RS is low (0), the data is to be treated as an instruction such as ‘move the position of the cursor’ or ‘clear the screen’. When RS is high (1), the data being sent to the display is a letter, number or punctuation mark that is to be displayed on the screen.

The RW line is the "Read/Write" control line. When RW is low (0), the information on the data bus is being written to the LCD. When RW is high (1), the program is effectively querying (or reading) the LCD. Only one instruction ‘check LCD status’ is a read command. All others are write commands--so RW will almost always be set to low.

The data bits on a parallel LCD display can accept up to 8 bits of data at a time. It is possible to use just four of the eight data bits if your microcontroller lacks enough connections to drive all 8 bits; however, this is a slow transfer of information. The data bit lines are numbered DB and begin at number DB0, DB1 etc. up to DB7.

The anode is the positive voltage for the backlight, while the K is the ground for the backlight. You have options when it comes to ordering your backlights; you can order an LCD display with either a 3.3V LED backlight or a 4.2V LED backlight.

One key component in LCD display programming is to make sure the controller driver you have designed will continue in production. Over time C/D suppliers will discontinue various models. So, the issue you solved with maintaining a steady supply chain does crop up again when models become obsolete. To mitigate the inconvenience, when the IC is discontinued, the LCD supplier will recommend a replacement or compatible controller. This is where the word ‘compatible’ does not mean ‘exact drop in equivalent’; however, we find that a compatible controller is an exact match 95% of the time. If you find yourself in that unlucky 5%, then you will either need to make a last-time buy of the controller that is being discontinued or change the software on your product to match the new controller.

In this tutorial we will see how to interface and graphical LCD(GLCD) with PIC16F877A. In this tutorial we will look at interfacing KS0108 controller based JHD12864E display. There are many displays out there based on KS0108 or compatible display controller. They all work the same way, but make sure to check the datasheet for the pin diagram before doing the connection.

We will look at the working of the display, the hardware setup and programming with PIC16F877A. You may use any other AVR,8051,PIC,ARM controller as well. We have it tested and working on 8051, AVR, PIC and ARM. We have similar tutorials on these MCUs as well.

Unlike a 16 x 2 display, this does not have a character map for ascii values stored on its ROM. However it allows us the flexibility of creating fonts like Arial, times new roman etc. We could also display bit-map images on it and stretching it little further we can make GUI"s and little animation, but that"s for another day. So lets get started.