Make sure not to put too much pressure on the transfer or the traces can be pressed together. If this happens, you can try cutting the toner away with a sharp knife, but you'll probably end up breaking the toner trace and have to start over. I hand-soldered the connector to the finished PCB and then added some breakaway pin headers so that the board may be breadboarded or socketed into projects while being easily removable.
After you have a breakout board for the LCD connector, you must connect it to your circuit. There are 10 pins on the connector, one is unused. The LCD driver circuitry runs on 3.
Raspberry PI and nokia LCD
However, the backlight requires a higher voltage around 7V. Using a 1K ohm resistor between the backlight power and a 12V power supply seems to work well, the voltage is around Vcc 3. Reset 3: Data 4: Clock 5: Chip Select 6: Unused Not Connected 8: Ground 9: Ground Backlight LED - This means that you will probably have to implement a software SPI output. Your microcontroller must be running at 3. The important ones are explained here and will allow you to get your LCD up and running. A full set of commands is listed in the PCF datasheet here: If set to 0, the data byte is interpreted as a command.
If 1, the data byte is interpreted as data. Data may be sent after issuing an appropriate command. Before you can write to the LCD, it must be initialized. First, the Reset line must be pulled low for around ms and then raised high again. The Reset line must remain high during operation. Then, a sequence of commands must be sent, in the following order: Continuing with the protocol, once the LCD is initialized it is ready to draw. Drawing works by first defining a region to draw and then streaming pixel data to fill that region. It is confusing at first, but if done properly is more efficient than pixel-by-pixel drawing.
A region is simply a rectangular area on the screen.
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We'll say it begins at point X1,Y1 and ends at point X2, Y2. It does this until it reaches X2, Y2 at which it stops accepting data. If you only want to draw one pixel, you simply set X1, Y1 and X2, Y2 to the pixel you want to draw. This defines the region as a single pixel. Any data sent after the first pixel's worth of data is discarded. To define a region, you must send these commands in the following order: In the default color mode 0x03, 12 bits per pixel color data uses 12 bits.
This means that you can send 2 pixels worth of data for every 3 bytes. If you are only sending one pixel, you only need to send 2 bytes. The 2-pixels-perbytes format is shown below: I modified the code some to clean it up and adapt it for the Phillips controller. It uses ATMega pins 11, 12, 13, and Rectangles are incredibly useful. You can draw one big rectangle to clear the screen, use them for menu elements, indicators, check boxes, frames, text backgrounds, and much more. Thankfully they are easy to draw on the Nokia LCD's. All you need to do is define a region the size of the rectangle and fill it in with a solid color.
The following AVR C code using the functions described in the last section will do this. Although this is a graphical LCD, it is still useful to be able to print text to it. To print text to a graphical LCD, you must define your own font table in your code and then print it character-by-character using the table. In my code, I have provided a font table one that I converted by hand because I couldn't find a good program to do it for me. The font is 6x8 which should allow you to fit plenty of text on the screen. I have provided functions for printing characters as well as strings.
Each byte of the font table represents one vertical column of the font. Since each character is 6 pixels wide, a 6-byte offset is used to find characters in the array. The code for this one is relatively long with the font table, so I'm not going to paste it here. The complete code is available for download at the end of this Instructable. With rectangles and text down, we can begin making truly useful stuff. Menus allow users to select from a large number of options with only a few buttons Up, Down, and Select are common. To make a menu that looks good, you need to format your screen and text properly.
I wanted a single title line and the rest to be menu entries. The LCD is x usable pixels in resolution. This means that I have vertical pixels to divide up into menu lines. Since my font is 8 pixels tall, I decided that using pixel-tall menu lines would be good. To make the menu system more portable, I built its functionality into a single function which takes a handful of arguments. This function will draw the menu and allow the user to select an option. The function returns the index of the selected option.
To make the code reusable, all menu text is loaded from an array. This is the function prototype: Each row is one menu line the first line is the title. All colors are bit values in 0x0RGB format The actual code is not posted because it is long, it is included for download at the end of this Instructable. When drawing moving objects on the LCD, you can greatly speed up the frame rate and eliminate screen glitches by only redrawing the moving parts of an object rather than redrawing the entire screen or entire object.
For instance, if a ball is moving across the screen, rather than redrawing the entire ball you can just draw the pixels along the edge that has moved and clear the pixels on the edge that has moved away. Techniques such as frame buffering and double buffering can be used, where a new frame buffer is compared against an old frame buffer and only differing pixels are written to the display.
However, given the limitations of AVR and similar 8-bit microcontrollers, these techniques are probably out of range. It is actually very easy to draw full color photos on the LCD! To convert the image into the correct format, I wrote a small application in Visual Basic VS that takes a x The serial port uses baud which is very fast for a microcontroller. This enables a quick transfer of image data to the microcontroller and it can draw a full x image in less than 1 second.
To do this, the microcontroller must be running at around 20MHz it must be exactly 20MHz to use the code unmodified, but it may work at 16MHz if the baud rate calculation is changed. Although the ATMega is only running at 3. I added text and menus then ported it to for use on my project board.
I then revised many systems which have been backported into the AVR code. Thank you for this instructable. I'm an accomplished mechanic with custom fabrication for various component and systems for race cars. I'm wondering how difficult it would be to change the colors of these 2 displays also to blue to match as best as possible to the blue led color. I have a spare dash cluster to use while this project is underway. Thanks in advance for any light: Reply 2 years ago. Have you had luck with your project?
I am not familiar, but it appears the display in such vehicles is usually not an LCD of any kind, but a vacuum fluorescent discharge tube display, VFD. It's a collection of thin shaped glass vacuum tubes that are coated with a Luminophore on the inside that determines their colour; correspondingly, while they can be manufactured in various colour, their colour can not be changed afterwards.
I am not aware of any possibility to get a custom one-off VFD made for you. It's possible to reverse engineer the signals driving the display, and then create a drop in replacement, based on a microcontroller interpreting the signal and driving a graphic display of some kind, an LCD or OLED. With OLED, there is the question of suitability to vehicle use.
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The displays aren't intended to run for hours on end, they degrade with use. Also their brightness is typically 10 times weaker than VFD. Also very few colours are available, you may be stuck with a colour that is more similar to that of VFD blue than your chosen LED blue. With LCD, there is an aesthetic issue with lowered contrast and potentially bad viewing angles.
An advantage of using a graphic display on a microcontroller is that you are not stuck with static symbols, you can adorn them with effect graphics, such as the frame of PRNDL gliding across the display or magnifying the currently active mode, beautiful, easily legible font for your odometer, etc. You can likely drive them with simple electronics just to reduce the current and voltage from the original VFD signalling.
While you can get numeric 7-segment LED indicators, you may need again signal re-encoding with programmable logic ICs or such, and there's a possibility of colour mismatch. What i'm thinking of being most promising, is laser cutting a light barrier from black Delrin or acrylic. Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in: Email required Address never made public. Name required. Electronics, Photography, Music; The holy trinity that makes it all worthwhile Advertisements.
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Running the Nokia 6610 LCD with a Raspberry Pi
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