attiny85 lcd display supplier

With respect to the hd44780 library, I am the author, and normally I would advise using it as it has many capabilities that are not in any other lcd library. However, in this specific case, (using the ATtiny parts), I would advise caution.

This is a compact graphics library that supports a range of different colour TFT displays, such as the displays from Adafruit and AliExpress. It uses standard Arduino SPI calls making it compatible with a variety of different boards and processors:

In my earlier article Tiny TFT Graphics Library I described a small graphics library designed for driving a variety of TFT displays from an ATtiny85. This library is an extension of that program, with the following enhancements:

* These Adafruit displays conveniently all have the same edge-connector layout, so you can make a prototyping board or PCB that will take any of them.

Some of the AliExpress displays include a LDO 3.3V regulator, but as far as I can tell none of them include logic-level translation, so I recommend only interfacing them to a processor running from 3.3V.

The Adafruit displays all include an LDO 3.3V regulator and logic-level translation, so can be safely interfaced to processors powered from either 5V or 3.3V.

On the AliExpress 160x128 display you need to connect the backlight pin to Vcc to turn it on. This doesn"t seem to be necessary with the other displays.

The library will probably support other TFT displays that use the same ST7735 or ST7789 driver chips, but you may need to experiment with the parameters to get the image scaled and centered correctly.

Two of these, Data In and Clock, are dictated by the SPI interface on the processor you are using. They are usually called MOSI and SCK on the pinout diagram, and they connect to the appropriate two pins on the display.

This graphics library will work with ATtiny processors that support SPI using the hardware USI peripheral, such as the ATtiny85, ATtiny84, and ATtiny4313, but note that on these devices the MOSI pin is labelled DO.

The library includes basic graphics routines for plotting points and drawing lines. These work on a conventional coordinate system with the origin at lower left. For example, on the 80x160 display:

The different displays are catered for by six constants which specify the size of the display, the offsets relative to the area supported by the display driver, whether the display is inverted, and the rotation value; for example:

Note that on some displays you may also have to change the xoff or yoff value when rotating the display. For example, to rotate the image on the 240x240 displays by 180° use the settings:

To check or adjust the values for each display I ran this program, which draws a one-pixel border around the display area, and plots an "F" to show the orientation:

This is a small graphics library, specifically aimed at ATtiny microcontrollers, for the variety of small colour TFT displays available at low cost from suppliers like Adafruit, AliExpress, or Banggood:

It"s an updated version of my Tiny TFT Graphics Library. This latest version of the library supports both the classic ATtiny processors, such as the ATtiny85, and the new 0-series, 1-series, and 2-series ATtiny processors, such as the ATtiny402. Like the original library it allows you to plot points, draw lines, draw filled rectangles, and plot characters and text with an optional scale factor, in 16-bit colour.

This version adds the ability to plot outline rectanges, and outline and filled circles. I"ve included demo curve-plotting and histogram-plotting programs that adjust to fit any display.

This library supports TFT displays that use an SPI interface and require four pins to drive the display. This leaves one pin free on an 8-pin chip such as the ATtiny85 or ATtiny402. If you need more pins choose a larger chip, such as the ATtiny84 or ATtiny404.

Unlike my Compact TFT Graphics Library which uses standard Arduino SPI calls, this library uses direct I/O pin manipulations. This means that you can use any assignment of pins to the four I/O lines needed by the display, and makes it about twice as fast as one using SPI calls. I"ve also added support for some additional displays, so it now supports 16 different TFT displays.

On the classic ATtiny processors, such as the ATtiny85, the library uses the feature that you can toggle one or more bits in a port by writing to the PINB register; for example, to enable or disable the chip-select signal:

So provided you set all the pins to their disabled state at startup, the display routines can simply toggle the appropriate pins to enable or disable them.

The differences between each family of processors are handled by constants to define the pin assignments, and preprocessor macros to define the bit manipulations. If you use the circuits given below you won"t need to change anything, apart from specifying which display you"re using.

The ClearDisplay() routine has been optimised further by realising that we don"t need to keep setting the mosi bit, since to clear the display it is always zero, so the routine only needs to toggle the sck bit the appropriate number of times. I"m grateful to Thomas Scherer for suggesting this.

This library will work with displays based on the ST7735 which supports a maximum display size of 162x132, or the ST7789 and ILI9340/1 which support a maximum display size of 320x240. It includes parameters for the following colour TFT displays:

* These Adafruit displays conveniently all have the same edge-connector layout, so you can make a prototyping board or PCB that will take any of them, such as my Universal TFT Display Backpack.

Some of the AliExpress displays include a LDO 3.3V regulator, but not logic-level translation, so I recommend only interfacing them to a processor running from 3.3V.

The Adafruit displays all include an LDO 3.3V regulator and logic-level translation, so can be safely interfaced to processors powered from either 5V or 3.3V.

On the AliExpress red 160x128 display you need to connect the backlight pin to Vcc to turn it on. This doesn"t seem to be necessary with the other displays.

The library will probably support other TFT displays that use the same ST7735, ST7789, ILI9340/1 driver chips, but you may need to experiment with the parameters to get the image scaled and centered correctly.

The display needs to be connected to the microcontroller via four I/O lines: MOSI, SCK, CS, and DC. You can use any pins for these, but they should all be in the same port. You need to specify the port pin numbers of the pins you are using at the start of the Tiny TFT Graphics Library listing.

The 33kΩ pullup resistor from the display"s CS pin is optional; it is only needed on the AliExpress displays, and holds the chip select high to prevent the display from flickering while programming the ATtiny85.

The different displays are catered for by seven constants which specify the size of the display, the offsets relative to the area supported by the display driver, whether the display is inverted, the rotation value, and the order of the colours; for example:

By default the parameters give the correct orientation assuming you"re using the display with the header pins along the top, except in the case of the larger displays which have the header pins along the shorter edge, in which case the header pins are assumed to be on the left.

To check or adjust the values for each display you can run the TestChart() program, which draws a one-pixel border around the display area, and plots a red "F" to show the orientation:

The library will probably support other TFT displays that use the same driver chips, but you may need to experiment with the parameters to get the image scaled and centered correctly.

The library includes basic graphics routines for plotting points and drawing lines. These work on a conventional coordinate system with the origin at lower left. For example, on the 80x160 display:

By default the ATtiny85 runs at 1MHz. Choose Burn Bootloader to set the fuses for 8MHz operation, or your graphics will run rather slowly, then upload the program using an ISP (in-system programming) programmer such as Sparkfun"s Tiny AVR Programmer Board

To display the readings the Weather Station uses a low-cost 96×64 OLED display with 64K colours, and an SPI interface. It’s available from a number of suppliers including Adafruit

The downside with this sensor is that you have to do quite a bit of calculation to get the final readings; it’s not just a case of reading the values from the device via I2C or SPI, as with some other sensors. Both Adafruit and Sparkfun provide a library to interface to the sensor, but unfortunately these don’t seem to work on ATtiny processors, such as the ATtiny85, so I set about writing my own Tiny BME280 library.

Using an LCD on a small chip like an attiny85 is not really that hard and till recent I didnt even think it warranted an instructable, but I have received questions about it, so I may as well expand on the process.

With the attiny only having a max of 6 pins available, it goes without saying that it cannot directly control all the pins of the standard Hitachi based LCD"s

A little bit over a year ago, I described how to add an LCD to an Attiny or other chip, using only 2 pins. That circuit made use of an HC164 shift register, but as I2C modules for LCD"s are extremely cheap and even LCD"s with a module already in place also are dirt cheap, one might as well use I2C on the Attiny85.

I2CThe attiny85 can simulate I2C on PB2 (pin 7) (SCL) and PB0 (pin 5) (SDA). The "Wire" library that is used to read and write bytes from and to the I2C port on the arduino doesnt work on the attiny. It needs the TinyWireM library to act as an I2C master

The "NewLCD" library from Francisco Malpartida is my favorite library, but also that one fails in using I2C for the Attiny because it makes a call to the Wire library. A modification to make it work with Attiny85 can be found here.

The "Bro Hogan" library however does work. It is basically the same library as the standard arduino LCD library, but it is modified to recognize the Attiny85 and the Attiny2313 and then makes a call to "TinyWireM" rather than "Wire".

Adafruit also provides a libray that works with the Attiny85 and that is described in another instructable. I will be using the Bro Hogan library here.

Most problems you may encounter are related to the IDE getting confused regarding the libraries. If you are using the standard Arduino LCD library, best replace it by the Bro Hogan library. If you are using Malpartida"s library and want to keep that (as it is a great library), move it out of the way. Grab the entire folder and move it out of your sketchbook/libraries folder. Make sure you have the TinyWireM library installed and make sure your libraries are up to date.

Now obviously there is no bootloader for the attiny85, but the process of burning the bootloader sets the fuses of the attiny from factory mode, to the mode you want to use it in. So, presuming you use the Arduino as ISP,:

ATTiny85 Connects to I2C OLED Display - Great Things Can Be Small: I recently came across a tiny OLED display which I also used for another project. This time I thought a tiny d…

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The actual manufacture part number is ATTINY85-20PU. It always tends to look like a lot of part numbers, but often it boils down to tape and reel vs tray, temperature ratings, and packaging. Sometimes you will even get different part numbers based on the default configuration (running at the full 20MHz, running at 1/2 clock speed at 10MHz, or using an external crystal for example), even though the actual chip is the same. For their naming convention usually you can find that in the ordering information at the bottom of the datasheet.

Finally the 85 appears. SparkFun is in the U.S., so I"m guessing PIC fan boys. AVRs not on the brain. - I"d like to see an ATtiny parts kit including ATtiny85, 20MHz crystal, crystal caps, bypass cap, and maybe a six pin ISP header. Even if these parts aren"t kitted the related products list below should include them. Nope, now I gotta go hunting; or maybe that"s the idea :-(

I just confirmed that the ArduinoISP can be used to program the SMD SMT version of the ATTiny85 chip. I used the Arduino 0022 IDE and board definitions and older version of the instructions from MIT High Low Tech. (The updated instructions for Arduino 1.0 fail for me.)

I"m trying to control a strip of a single Neopixel with an Attiny85 @ 16Mhz (internal PLL, 4.3 V BOD) but it just doesn"t work. the example "strandtest" just makes the led stuck in green, any help? i"m just connecting the data cable of the neopixel to the Pin 7 (PB2) in the Attiny, i also try putting a resistor in this, but it doesn"t help.ATTINY85

Yep! The ATtiny85 ships with a fuse that makes them operate at internal 1MHz. That fuse can be changed to operate at 8MHz internal. If you need to go above that (or need better precision than the internal oscillator) you can set the fuses to operate with an external oscillator. 20MHz is the maximum external oscillator allowed.

(see: http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=107166&productId=107166&keyCode=WSF&CID=GOOG&gclid=CI2TocLm6rICFexAMgodOU0ALQ for the

Hi all! I"ve recently bought two of these Attiny85 chips. I followed the MIT hi-low tech-group instructions on using Arduino as an ISP to program the chips.http://hlt.media.mit.edu/?p=1229

30 Apr 2014 on prototyping | electronics | microcontrollers | attiny The Garage Lab Nokia 5110 LCD Displays on the ATtiny

To test the software SPI implementation in my ATtiny85 template project I wanted to use a component that I have had experience with before, was fairly simple to use and would be useful. A small Nokia LCD display ts the bill nicely.

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If you are not familiar with these they are a 1.5" monochrome LCD with an 84 x 48 pixel resolution that were used in older Nokia phones such as the 3110 and 5110. These screens are widely available and very cheap (around $AU 3 on eBay). You can get them from SparkFun and AdaFruit as well.

There are a number of interface libraries available for the Arduino already but in this post I"m going to present a more low level interface. Most of the Arduino libraries I"ve seen use an off screen frame buffer to prepare the image before sending it to the display itself. This method consumes 504 bytes of RAM which is almost all of the available 512 bytes on an ATtiny so it"s just not acceptable in our restricted environment. This library consumes no RAM and sends the data directly to the display - this imposes some limitations on what you can display and prevents any meaningful image composition (drawing text over images for example) but with a bit of forethought you can work around this to achieve nice looking

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Connecting the Display The display provides an SPI interface with most of the expected pins present (MOSI, SCK and CE - MISO is missing, you can"t read data back from the device which is why many libraries use the off screen frame- buffer). On top of that though there is a pin to select between command and data modes as well as a RESET pin which you will need to be able to manipulate during device initialisation. The next image shows how I wired everything up for this example.

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Sending Commands The LCD supports 8 separate commands which are broken into a "normal" and "extended" command set. The majority of the "extended" commands are to do with initialisation and device conguration, they are generally only sent immediately after the device is turned on in order to put it in a working state.

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/** Send a command byte to the LCD * * @param cmd the command byte to send. */ static void lcdCommand(uint8_t cmd) { // Bring CD low PORTB &= ~(1 << LCD_CD); // Send the data sspiOutMSB(LCD_SCK, LCD_MOSI, cmd, 8); }

The LCD_CD, LCD_SCK and LCD_MOSI constants dene the pins that are being used for communication. To actually send data I"m using the sspiOutMSB() which is part of the template library I developed. This particular function implements the SPI protocol in software allowing you to transfer data via SPI on arbitrary pins.

/** Send a data byte to the LCD * * @param data the data byte to send. */ static void lcdData(uint8_t data) { // Bring CD high PORTB |= (1 << LCD_CD); // Send the data sspiOutMSB(LCD_SCK, LCD_MOSI, data, 8); }

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/** Initialise the LCD * * Sets up the pins required to communicate with the LCD screen and then does * the actual chipset initialisation. The pin numbers to use are defined in * @ref hardware.h. */ void lcdInit() { // Set up the output pins, ensuring they are all "low" to start uint8_t val = (1 << LCD_SCK) | (1 << LCD_MOSI) | (1 << LCD_RESET) | (1 << LCD_CD); PORTB &= ~val; DDRB |= val; // Do a hard reset on the LCD wait(10); PORTB |= (1 << LCD_RESET); // Initialise the LCD lcdCommand(0x21); // LCD Extended Commands. lcdCommand(0xA1); // Set LCD Vop (Contrast). lcdCommand(0x04); // Set Temp coefficent. lcdCommand(0x14); // LCD bias mode 1:48. lcdCommand(0x20); // LCD Normal commands

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The rst thing we do is initialise the IO pins that are going to used and ensure they are all set low. We then wait for 10ms (to make sure the voltage levels have well and truly settled) and raise the RESET pin high to reset the LCD.

Immediately after that we congure the LCD driver operation. The temperature coefcient and bias mode are the recommended values from the datasheet and can be left as they are. The LCD Vop value is essentially a contrast control (it controls the bias voltage to the liquid crystal). The command format is 01nnnnnn in binary where nnnnnn is a value between 0 and 64 inclusive. If this value is too high the entire display will be too dark and you won"t be able to make out the image from the background, conversely if it is too low the display will appear washed out. The value used in the initialisation sequence above seems to provide good readability with sharp contrast - you can raise or lower it to suit your display if you need to - just make minor modications (+/- 8 to start with) until you get a value that works for you.

The nal command sets the addressing mode - this determines the order in which pixel data is sent to the device. Before we move on to that we need to look at how the pixels are stored in the displays memory.

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To change the displayed pixels you send a byte to a specic row and column address - the bits in the byte set the value of each pixel in the row from the top (bit 0) to the bottom (bit 7). If you are used to the normal frame-buffer layout that goes from left to right, top to bottom this can be a little more difcult to get used to, calculate the correct offset to write a pixel using standard cartesian co-ordinates is certainly more complicated.

Writing Pixels To write pixels to the display you need to set the row and column addresses as a command and then write data values to store in the LCD memory. The address will automatically increment as each data byte is received so you don"t need to set the address for each byte. The following code shows a simple example of this:

/** Clear the screen * * Clear the entire display. * * @param invert if true the colors are inverted and the screen will be filled * with black. */ void lcdClear(bool invert) { uint8_t fill = invert?0xFF:0x00; // Set the position lcdCommand(0x80);

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lcdCommand(0x40); // Fill in the whole display for(uint16_t index = 0; index < (LCD_COL * LCD_ROW); index++) lcdData(fill); }

Simple Display Routines I"ve kept the set of routines available very simple on purpose. As well as the screen clearing function (shown above) there is a function to clear a single row. For general output I"ve provided functions to display text (both plain and inverted) and small images. These functions are described below.

Drawing Text The controller chip in the LCD does not have direct support for displaying text, you have to send the characters as bitmaps. I have included static data for a simple 5 x 7 pixel font in the library that is laid out in vertical strips so it is a quick process to render individual characters.

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The font draws in a 5 x 7 pixel area but lls a 6 x 8 pixel square to provide spacing between characters both horizontally and vertically. At this resolution you can display up to 14 characters on each of the 6 lines of the display. I"ve provided functions for displaying single characters as well as NUL terminated strings from RAM or PROGMEM.

Drawing Images To draw images efciently it helps if they are stored in the same layout as the graphics memory in the module - that is, a sequence of 8 pixel vertical strips that can be sent to the display. I"ve added a function that will display images directly from PROGMEM. It expects a descriptor byte as the rst data value which contains the width (in pixels) and height (in rows) of the image data that follows. This is packed into a single byte as HHWWWWWW where HH is one less than the height of the image (in 8 pixel rows) and WWWWWW is one less the width of the image in pixels. The bytes following the descriptor are vertical strips of 8 pixels each, WWWWWW + 1 for each row.

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the image extends past the borders of the display it will simply be clipped. Once again, the routine will modify all pixels in the rectangle covered by the image erasing what was previously on the screen in that area.

Because manually generating the byte array for an ima would be a time consuming (not to mention annoying) process I wrote a simple Python script to convert arbitrary images into array denitions that can be embedded in your code. The script is called lcdimage.py and I"ve added it to the tools directory in the GitHub repository - simply run the script with a list of lenames and it will generate C code that you can paste into your project.

What Next? These displays are cheap and easy to use - a good option to add a simple UI to your project. The downside is the number of pins they use - 4 out of the 6 available on the ATtiny. It might be possible to control the RESET pin on the module with external circuitry rather than though an IO pin which would save another pin. The RESET line is not used after initialisation so you could reuse it as an analog input as long as the voltage being sampled

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doesn"t fall below 0.7V - in one circuit I"m designing I"m using it to monitor a 6V battery pack through a voltage divider, in this case the device will power off before the voltage drops below 1.6V so it will not trigger a reset of the display.

You could use the single pin keypad I described earlier to provide simple menu navigation - the one pin serial interface could then be used to send menu selection data to a host machine (such as a Raspberry Pi without a display) to trigger some action.

Another idea is a simple Bluetooth enabled temperature sensor with display - the ATtiny has a built in temperature sensor so no external components are required for that, the battery could be monitored through the RESET line and the remaining two pins could be used to implement a serial interface to a HC05 Bluetooth module.

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Shane Gough Mod > Dave 2 years ago Hi Dave, glad it"s working for you. If you are interested in serial communications on the ATtiny85 there is a software serial implementation in the library as well, it will use up less pins than the LCD interface and works nicely at 57600 baud. Reply Share

There is another project out on the internet that has the Arduino talking to the Nokia 5110 http://playground.arduino.cc/C... but I was not able to get it to work on the ATtiny85. I used a combination of their bit shifting code and your output code and alphabet to get it working. Their routines connect CE on pin 3 of the ATtiny85, but it started working as soon as I disconnected that pin and hooked it up the way you have documented. Not sure what that is about because their project works fine with the Arduino. The CE pins seems like a minor difference and it was only used in one function, lcdWrite, which does the bit shifting.

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