adafruit 1.8 tft lcd shield quotation

I recently purchased the 1.8" TFT Shield with MicroSD Card (ID 802) assembled the connectors, plugged it into my Arduino UNO and tried to run the "graphicstest" script from the Adafruit Library as described on Adafruit.com, but the screen remained black. However, if I push the Reset button on the Shield at the right time, it displays the color screen test that is active at the time. This shield is marked as Adafruit Seesaw compatible which controls the 5-Way Nav + 3 Buttons and Backlight. I run the test in the SPI mode (Fast method) as directed in the test script. The script uses Pin 9 for TFT_RST which does not work. I also set the #define TFT_RST -1 as directed in the comment, but it still does not turn on the Backlight. I put extra delays in the test script and Serial.println"s at each test so I can push the TFT_RST button in order to see the individual test displays turn on. At each test the results were positive, so the TFT is working but no Backlight. I"ve checked the soldering. It is good. I found in another post on this Forum that some of the TFT boards had problems with the Reset pin and Seesaw was supposed to fix it. Is my board bad or is there a problem with the test script? The ID numbers on the back of my TFT Shield is E336755, GC-2, 94V-0. The board is also marked as seesaw. Don"t know if this info helps. How can I turn on the Backlight? Do I have to pull down/up Pin 9?

I suggest you install the Seesaw library in Arduino IDE and look in the examples for Seesaw. There is one for the new shield. It should work better than the old 7735 example in the tutorial.

Hopefully Adafruit will soon find time to update the tutorial and document the Seesaw backlight function. I couldn"t figure how to use it looking at the library. A few comments are missing ;-)

The error is in tft.pushColor.... which I changed to a lower case "c"..... tftpushcolor.... to get it to compile. When I run the script, it fails to pass the first lines in setup(). So I put Serial.print"s in setup and in the Libraries to debug the failure. Here are snippets of my Debug code and the outputs:

This failure acts like it could not read the register. Either the code is using the wrong register address or the hardware is bad. Notice that the seesaw addr = 2E which in file Adafruit_TFTShield18.h is #define TFTSHIELD_ADDR 0x2E. I"m not sure if this is the proper address since in file Adafruit_seesaw.h the seesaw addr is #define SEESAW_HW_ID_CODE0x55.

So, is there a bug in the Libraries or is my hardware bad? I run this on an Arduino UNO with the TFT shield plugged into the UNO"s headers. No other wiring is used. I expected the boards to run stacked directly. Am I doing something wrong? I examined the Shield to see if it has a Seesaw chip on-board and it does appear so. All soldering seems good. And as I explained in my first Post, I can see the image display show if I push and hold down the Reset button. In any event there is at least one bug in the shieldtest.ino file.

Sorry, I can"t post a photo. It is too large. However, the backside of the TFTShield does say it uses Seesaw. There is also no other hardware connections. The Shield is plugged on top of the UNO. On the top side of the Shield it is marked as 1.8" TFTShield followed by a letter B in a circle. I don"t know if this is a version number. I think there are two different drivers as indicated in the File: Adafruit_ST7735.h ...... Subclass of ST77XX type display for ST7735B and ST7735R TFT Drivers.

The chip on the Shield is an Atmel ATSAMD09U. I need to get the Spec Sheet on this device to understand how it is initialized. I have experience with low level hardware programming. Maybe I can discover what is wrong with the setup code. I"ll to investigate this and Post my results, if any. I apparently have one of the new TFTShields which still may need more development.

I can confirm the I2C address for the Seesaw in the shield is 0x2E. I attached the example I modified a bit to fix the BMP image not loading bug I had. There is one line that made the difference:

For me, the BMP would not display without it. My example still includes some debugging code, but I confirm this code DID work on my rev "B" 1.8" TFT shield PN#802. Yes, the "B" in a circle is the board revision!

Have you checked the connection between the SCL/SDA pads on the shield and your board? The pins are on the top connectors, 2 leftmost pins on the shield. Can you test some other I2C device on those pins? We need to make sure those two pins are working!

I can confirm the I2C address for the Seesaw in the shield is 0x2E. I attached the example I modified a bit to fix the BMP image not loading bug I had. There is one line that made the difference:

For me, the BMP would not display without it. My example still includes some debugging code, but I confirm this code DID work on my rev "B" 1.8" TFT shield PN#802. Yes, the "B" in a circle is the board revision!

Have you checked the connection between the SCL/SDA pads on the shield and your board? The pins are on the top connectors, 2 leftmost pins on the shield. Can you test some other I2C device on those pins? We need to make sure those two pins are working!

I soldered the connectors to the TFTShield as directed on the Adafruit site. It showed that the 2 pins closest to the USB and Power Jack should be unconnected. That caused SCL/SDA pads to not be connected between the UNO and the Shield. This could be the problem. If these pins need to be controlled from the UNO, then the data Bus will be open therefore returning 0xFF for the HW_ID. I"ll connect these pins and see what happens. The attached photo shows the missing pin contacts from the bottom side of the TFTShield. You may be on track. Thanks!

See attached photo below in this thread. Martin has suggested that I connect the UNO"s SCL/SDA pins to the TFTShield. I need to know from you if this is correct. I don"t want to falsely connect any outpins together and damage the hardware. Please let me know if I should have connected these pins. The Adafruit site did not indicate that these pins should be connected via the pin connectors. It said to cut 2 connectors as 6 pins and 2 more as 8 pins, thus leaving the 2 pins on each side connectors nearest the USB and Power Plug unconnected (i.e. open). I"ll wait your reply before making this change.

Yes that was the site I used to build the connectors. It was confusing, but I followed the directions exactly since I thought the missing pins may have been connected somehow by parts on the Shield and the pins from the UNO were not needed. You may need to update the instructions. Hope this helps. I think we may be able to get this working. Thanks for your and Martin"s help.

Yes, the shield section of that guide, as well as the code, was for rev "A" of the shield. That information needs updating as the old version was not UNO rev 3 compliant, so:

I soldered the connectors to the TFTShield as directed on the Adafruit site. It showed that the 2 pins closest to the USB and Power Jack should be unconnected. That caused SCL/SDA pads to not be connected between the UNO and the Shield. This could be the problem. If these pins need to be controlled from the UNO, then the data Bus will be open therefore returning 0xFF for the HW_ID. I"ll connect these pins and see what happens. The attached photo shows the missing pin contacts from the bottom side of the TFTShield. You may be on track. Thanks!

Just add pins to fill the missing pads on your shield, two for SCL/SDA pins, (standardized I²C position in the UNO rev 3 layout) and the two near the Power pins (reserved pin, IOref pin). Those near Power are not used by the shield however.

BTW, the only pins used by the shield are those circled. The other ones would be useful to people using stacking headers, but are not connected anywhere but to the adjacent pad. They also help for mechanical strength.

I added the extra 2 pin connectors to both sides of the TFTShield and got the Buttons, Joystick, and the display working, but I can"t load the parrot.bmp image ("File not found"). This may be due to the fact that my MicroSD card is formatted for Raspberry Pi Linux. I need to get a standard FAT MicroSD and try it. If it too has problems, I"ll work on debugging the SD Library. I know that the LCD display works, because I can run the Non-Seesaw shieldtest from the Adafruit_ST7735 Library and get the parrot.bmp image to display as long as I hold down the reset pin to turn on the Backlight.

The Adafruit 1.8in. Colour TFT shield displays full 18-bit colour with a resolution of 128 x 160. The neat display is complimented by a 5-way joystick for user input and a micro-SD card socket for FAT16/FAT32 format cards. You can use some or all of the board"s features depending on your project, the screen uses 4 x GPIOs for SPI, the joystick uses 1 x analogue input, and the SD-card uses 2 x GPIOs. For best performance use a microcontroller board with a hardware SPI such as the Arduino Uno or Orangepip, though this screen will work with software SPI on an Arduino Mega for example. Thanks to its on-board ultra-low dropout 3.3V regulator and 3 to 5V level shifter it"s safe to use with full-fat (5V) Arduinos. Get started by downloading Adafruit"s Open Source graphics library and dive into their tutorial.

The shield is supplied with everything soldered on except the 0.1in. headers which are included for you to add if your project needs them. Arduino and micro-SD card not supplied.

Hi guys, welcome to today’s tutorial. Today, we will look on how to use the 1.8″ ST7735  colored TFT display with Arduino. The past few tutorials have been focused on how to use the Nokia 5110 LCD display extensively but there will be a time when we will need to use a colored display or something bigger with additional features, that’s where the 1.8″ ST7735 TFT display comes in.

The ST7735 TFT display is a 1.8″ display with a resolution of 128×160 pixels and can display a wide range of colors ( full 18-bit color, 262,144 shades!). The display uses the SPI protocol for communication and has its own pixel-addressable frame buffer which means it can be used with all kinds of microcontroller and you only need 4 i/o pins. To complement the display, it also comes with an SD card slot on which colored bitmaps can be loaded and easily displayed on the screen.

Due to variation in display pin out from different manufacturers and for clarity, the pin connection between the Arduino and the TFT display is mapped out below:

We will use two libraries from Adafruit to help us easily communicate with the LCD. The libraries include the Adafruit GFX library which can be downloaded here and the Adafruit ST7735 Library which can be downloaded here.

We will use two example sketches to demonstrate the use of the ST7735 TFT display. The first example is the lightweight TFT Display text example sketch from the Adafruit TFT examples. It can be accessed by going to examples -> TFT -> Arduino -> TFTDisplaytext. This example displays the analog value of pin A0 on the display. It is one of the easiest examples that can be used to demonstrate the ability of this display.

The second example is the graphics test example from the more capable and heavier Adafruit ST7735 Arduino library. I will explain this particular example as it features the use of the display for diverse purposes including the display of text and “animated” graphics. With the Adafruit ST7735 library installed, this example can be accessed by going to examples -> Adafruit ST7735 library -> graphics test.

The first thing, as usual, is to include the libraries to be used after which we declare the pins on the Arduino to which our LCD pins are connected to. We also make a slight change to the code setting reset pin as pin 8 and DC pin as pin 9 to match our schematics.

Next, we create an object of the library with the pins to which the LCD is connected on the Arduino as parameters. There are two options for this, feel free to choose the most preferred.

This great little shield offers a simple way to add both a small screen, micro-SD card slot and a joystick to your Arduino project. The 1.8" display has 128 x 160 colour pixels and is a true TFT offering 18-bit colour (262144 shades).

The display uses 4 pins to communicate and has its own pixel-addressable frame buffer, so you can use it without using all the memory or pins. The shield has an ultra-low-dropout 3.3 V regulator and a 3/5 V level shifter so it is safe to use with both 3.3 V and 5 V Arduinos.

This shield works best with the Arduino UNO and compatible boards. On the Adafruit.com website, there is a full open source graphics library that can draw pixels, lines, rectangles, circles, text and bitmaps as well as example code and a wiring tutorial. The code is written for Arduino but it can be ported to another microcontroller.

Spice up your Arduino project with a beautiful small display shield . This TFT display is small (1.8" diagonal) bright (4pcs white-LED chips) and colorful (18-bit 262,000 different shades)! 128x160 pixels with individual pixel control.

The shield is fully assembled, tested and ready to go. No wiring, no soldering! Simply plug it in and load up our library - you"ll have it running in under 10 minutes! Works best with any classic Arduino (UNO/Due/Mega 2560).

This display shield has a controller built into it with RAM buffering, so that almost no work is done by the microcontroller. You can connect more sensors, buttons and LEDs.

This tutorial is for our 1.8" diagonal TFT display & microSD in both the shield and breakout board configurations. These displays are a great way to add a small, colorful and br…

The 1.8" display has 128x160 color pixels. The TFT driver (ST7735) can display full 18-bit color. The breakout has the TFT display soldered on (it uses a delicate flex-circuit connector)

In the above example, Node32-Lite and this 1.8-inch LCD.  Please refer to the tutorial here: ST7735S interfacing with ESP32 to make the connections, Arduino library installation, and modification needed for it to works on this LCD.

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