PDF-(BOOK)-Using Graphic Touch Screens and SD Cards with Arduino

Arduinos are mini computers on a circuit board designed primarily for controlling electronic circuits They have analog and digital inputs and outputs that allow them to input data and turn things on and off For some applications like building a robot no direct interface with humans such as a keyboard or display screen is necessary For some applications however you will want to display information and also input commands For example you may be designing a sensor device to monitor sensor readings tricorder anyone In this case you will want to have a display You may also want to input instructions or information into the Arduino In that case you will need some kind of buttons menus or analog control devices like volume controlsYou can have an LCD display to read information and some switches and knobs but why not combine everything into one handy inputoutput device Touch screens are perfect for this They can display information as text or graphic You can also cause them to display buttons or other graphic symbols that you can touch to make selections One device can handle the entire humanArduino interactionFor this book I will be working with the Seeed that is not a misspelling there are three e8217s Studio 248221 240 x 320 pixel touch screen Version 2 httpwwwseeedstudiocom This is the best documented and most consistent touch screen on the market However if you are familiar with other brands of touch screens you can still apply the basic code in this book The libraries for each brand of touch screen might use slightly different commands for such things as initializing the screen printing text to the screen drawing rectangles or circles on the screen and so on However if you simply substitute the appropriate command used by your screen for the one used in the sketches in this book such as myGLCDInitLCD or Tftinit for TftTFTinit the basic program concepts used in this book should work I have written the code with most of the values such as screen size defined at the beginning of the sketch to allow for easy modification and the purposes and functioning of most lines of code are explained step by step so you can understand what everything does and how to modify it to your needsI will start out by addressing some of the problems with connecting touch screens to Arduinos due to a bit of a design flaw in the shields I will then go on to give sketches Arduino talk for software programs commonly referred to as apps these days for creating text menus buttons sliders and other controls that you are probably familiar with in normal windows programs I will also discuss outputs like text both static and scrolling graphs and histograms for output There is also a chapter on creating a system for swapping screens so you can have more than one screen of controls or information within a sketch Finally I will show how to use the SD or microSD card that some touch screens have built in The techniques used in that chapter should work on SD card readers that come separate from touch screens too In the Appendix I will provide information on how to download the sketches in this book to save you typing and how to contact me for questions. Figure 1 is a block diagram of a touchscreen system where the touch screen sensor lies on top of the systems display in this case an LCD panel The touchscreen controller in Figure 1 does not need any calibration by itself However products or instrum Figure 1 is a block diagram of a touchscreen system where the touch screen sensor lies on top of the systems display in this case an LCD panel The touchscreen controller in Figure 1 does not need any calibration by itself However products or instrum Figure 1 is a block diagram of a touchscreen system where the touch screen sensor lies on top of the systems display in this case an LCD panel The touchscreen controller in Figure 1 does not need any calibration by itself However products or instrum Touch screens have simplied technology, but there has yet to be a way to capture the precision of a calligrapher or the stroke of an artist. Not only should it meet your needs, but a stylus should ha through a Visual Studio C# Program. This is a simple example of a Visual Studio C# program passing data to an Arduino through the serial port.. The C# program sends a short string to the Arduino that is used to turn the on-board LED on and off.. Breadboard and Multimeter. EAS 199A Fall . 2011. Work in teams of two!. Your Multimeter. leads. probes. pincer clips – good for working. with. breadboard . wiring. You will use the multimeter to understand and troubleshoot circuits, mostly. Wiring. The screens communicate over a specific protocol called . I2C. It uses two communications pins, SDA and . SCL. On UNO boards, the . A4. and . A5. pins perform this task. Wiring. Wiring. CIJE boards contain both:. EAS 199A Fall . 2011. Work in teams of two!. Your Multimeter. leads. probes. pincer clips – good for working. with. breadboard . wiring. You will use the multimeter to understand and troubleshoot circuits, mostly. 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