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# Load BMP Image from SD Card And Display It On a 3.5" LCD Touchscreen With Arduino UNO R3/R4 | ||
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![GitHub License](https://img.shields.io/github/license/Aditya-A-garwal/Arduino-TFT-3-5-SDCard-BMP) | ||
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## Overview | ||
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This repository contains a program to load a BMP Image from an SD Card and display it on a 3.5" touch screen display shield with an Arduino UNO R3/R4, as shown below - | ||
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|![Image of LCD Touch Shield from Top](images/LCD_top.png)|![Image of LCD Touch Shield from Bottom](images/LCD_bottom.png)| | ||
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Most 3.5" LCD Touch displays use the ILI9486 Display Driver and include a resistive touchscreen. **The PCB Layout & silkscreen text may vary slightly between displays. This does not change their behaviour and functionality.** This repository depends on the following libraries - | ||
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- [Adafruit Touch Screen Library](https://github.com/adafruit/Adafruit_TouchScreen) to manage touch input | ||
- [Adafruit GFX Library](https://github.com/adafruit/Adafruit-GFX-Library/tree/master) for graphics primitives | ||
- [This fork of the MCUFriend KBV library](https://github.com/slviajero/MCUFRIEND_kbv) to drive the display (this makes it compatible with the UNO R4) | ||
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The program has been written using PlatformIO, and has been tested on the [Arduino UNO R3](https://docs.arduino.cc/hardware/uno-rev3/), [Arduino UNO R4 Minima](https://docs.arduino.cc/hardware/uno-r4-minima/) & [Arduino UNO R4 WiFi](https://docs.arduino.cc/hardware/uno-r4-wifi/). | ||
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The loadBMP, read16 and read32 functions in [```src/main.cpp```](/src/main.cpp) have been taken from [this example in the MCUFRIEND repository](https://github.com/prenticedavid/MCUFRIEND_kbv/blob/master/examples/showBMP_kbv_Uno/showBMP_kbv_Uno.ino), for fair use and educational purposes. All code taken from other repositories belongs to their respective authors and are protected by their respective licenses. | ||
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## Building/Uploading With PlatformIO | ||
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Since this project has been written using PlatformIO by default, simply run the following commands to fetch the libraries, build the project and upload the program - | ||
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```shell | ||
pio pkg install | ||
pio run | ||
pio run --target upload | ||
``` | ||
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## Building/Uploading With Arduino IDE | ||
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Create a new sketch and copy the contents of [```src/main.cpp```](/src/main.cpp) from this repository into the default ```.ino``` file. Create a new tab/file in the IDE named ```constants.h``` and copy the contents of [```src/constants.h```](/src/main.cpp) from this repository into this file. | ||
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Install the Adafruit Touch Screen Library and Adafruit GFX Library from the Library Manager (under *Sketch>Include Library>Manage Libraries...*) | ||
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Download [this](https://github.com/slviajero/MCUFRIEND_kbv) repository as a ZIP file and install it by navigating to *Sketch>Include Library>Add .ZIP Library*, and selecting the downloaded file from the file explorer. | ||
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After this, you can Build and Upload the program as usual. | ||
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## Using the Example | ||
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Format an SD Card with a FAT32 filesystem with a single drive. Load a BMP Image whose dimensions are under 320x480 into the SD Card and plug the SD Card into the slot situated on the back of the display. A [BMP Image File](/example.bmp) is included in the repository in case one is not immediately available. | ||
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As soon as the program is uploaded, the display should turn red and the image should be slowly painted on the display, starting from the top-left corner. | ||
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## Troubleshooting | ||
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Some common problems and their solutions - | ||
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|Problem|Solution| | ||
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|Display stays white after uploading program|Non-Standard Driver (not ILI9486)| | ||
|Display not responding after touch|Try changing the order of the touch pins in ```src/constants.h``` file, i.e. swap the values of ```XP```, ```YP```, ```XM``` and ```YM```| | ||
|Compilation issues related to SPI|Update the Arduino IDE version and/or install the SPI library| | ||
|Display Flickering/Arduino is reset automatically|Faulty Power Supply/Cable| | ||
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