tft display 800x480 w o touch test adfruit free sample

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I recently found a discount code through SlickDeals for $10 off the Elecrow 5" HDMI Touchscreen display for the Raspberry Pi. Since the Raspberry Pi was introduced, I"ve wanted to try out one of these mini screens (touchscreen or no), but they"ve always been prohibitively expensive (usually $60+).

This screen hit the right price (even regular price is $40, which is near my "okay for experimentation" range), and I picked it up, not knowing what to expect. I"ve had mixed experiences with Pi accessories from Amazon, and had never tried a product from Elecrow.

This review will walk through my experience connecting the Pi, getting the screen working correctly, getting the _touch_screen working correctly, and then how the whole system works with a Raspberry Pi 3. (See my separate Raspberry Pi 3 model B review).

The display is pretty solid, and comes well packed in styrofoam with four standoffs for mounting, a cheap plastic stylus, and a male-to-male HDMI daughter-card. Getting the Pi onto the board is easy enough; I used one standoff through one of the Pi"s mounting holes (on the side with the HDMI plug), then seated the Pi directly on top of the GPIO slot on the display board, so so the HDMI ports would line up perfectly on the other side.

After assembly, the entire unit is pretty solid; though due to all the exposed leads, I"d still recommend at least using something static-free and non-conductive to house the unit!

The Elecrow officially supports the Raspberry Pi 3 model B, but I tested it with a 2 model B as well. I didn"t try it with a B+, but the hardware layout should work, so at least the HDMI display would work correctly (not sure about the touchscreen controls). The way the hardware is laid out, you seat the Raspberry Pi directly onto a GPIO socket (it takes up the first 13 sets of GPIO pins—pins 1-26), and then there"s an included HDMI male-to-male daughtercard that slots in nicely to connect the HDMI output of the Pi to the HDMI input on the display.

There"s an extra OTG USB plug on the display if you want to give it a separate power source, but if you plug it straight into the Pi"s GPIO, it will leech off the 5V connection. As long as you have a good 2A power supply for your Pi, though, you shouldn"t have to worry about supplying independent power to the display. In my usage, I only saw the overvolt indicator every now and then (just like I do in normal usage of the Pi 3, since it uses a bit more power than a 2!).

When I first booted the Pi attached to the display, there was a large white area on the right, and only the left portion of the screen was being used by the Pi (it was only using 640x480 of the 800x480 display). To fix this, you have to set a few display options in the configuration file the Raspberry Pi reads during startup to switch certain hardware settings.

Edit /boot/config.txt (either while booted into Raspbian, or on another computer directly on the microSD card), making sure the following values are set:

Note: If the Pi boots up to a funny-looking screen and you can"t see anything, you can either reformat the microSD card, or pull it, edit the /boot/config.txt file from another computer to fix it, and put it back in the Pi.

Besides being a 800x480 HDMI display, the Elecrow also has a touchscreen overlay that allows simple one-point resistive touch detection on the screen. Note that at best, resistive touch is not nearly as responsive and intuitive as capacitive touch detection, which you"re likely used to on any recent smartphone or tablet screen. But something is better than nothing, when it comes to building simple UIs for "Internet of Things" devices or other fun things.

I tried to find some kind of downloadable driver for the XPT2046 touch controller, but didn"t find a lot of helpful information. Elecrow"s Wiki has some helpful information, a link to a setup PDF, a link to some configuration examples... but some of this seemed to be formatted incorrectly (likely due to bad copy/pasting or PDF formatting), so ignore that info and use this process instead (all commands run from the Terminal app):

These commands first install the touchscreen calibration utility, then configure the Pi to use the correct GPIO settings so touches can be interpreted as mouse moves/clicks by the Pi.

After you make those changes, reboot the Pi via the UI or in the Terminal with sudo reboot. Once it reboots, you need to calibrate the touchscreen. To do that, go to Menu > Preferences > Calibrate Touchscreen (see image below):

Once calibrated, the accuracy is pretty good, using either the included stylus or your fingernail. Note that the default Raspberry Pi UI is totally unoptimized for small (or even large) touchscreen use. You should probably get to work building your own touchscreen UI now :)

For ~$30 ($40 without discount), I wasn"t expecting a mind-blowing retina display with excellent glare-reducing coatings and contrast. But I do expect no dead pixels, and at least a crisp, vibrant picture when looking straight on. This screen is "good enough" in that regard, though viewing angles aren"t too great; side to side is okay, but looking down from above or up from below results in a bit of a washed out picture. Also, there is no antireflective coating on the screen, so wherever you use it, you need to be aware of nearby light sources.

So, to summarize the review: this is everything I expected out of a sub-$50 display. It"s nothing like a high-end smartphone display with capacitive touch, so if that"s what you"re expecting, you"ll have to look elsewhere. But if you just want a small display that mounts to the Pi easily and is more affordable than the Raspberry Pi Foundation"s own 7" touchscreen, this is a great buy!

This 5.0" TFT screen has lots of pixels, 800x480 to be exact, and an LED backlight. Its great for when you need a lot of space for graphics. These screens are commonly seen in c…

In this guide we’re going to show you how you can use the 1.8 TFT display with the Arduino. You’ll learn how to wire the display, write text, draw shapes and display images on the screen.

The 1.8 TFT is a colorful display with 128 x 160 color pixels. The display can load images from an SD card – it has an SD card slot at the back. The following figure shows the screen front and back view.

This module uses SPI communication – see the wiring below . To control the display we’ll use the TFT library, which is already included with Arduino IDE 1.0.5 and later.

The TFT display communicates with the Arduino via SPI communication, so you need to include the SPI library on your code. We also use the TFT library to write and draw on the display.

In which “Hello, World!” is the text you want to display and the (x, y) coordinate is the location where you want to start display text on the screen.

The 1.8 TFT display can load images from the SD card. To read from the SD card you use the SD library, already included in the Arduino IDE software. Follow the next steps to display an image on the display:

Note: some people find issues with this display when trying to read from the SD card. We don’t know why that happens. In fact, we tested a couple of times and it worked well, and then, when we were about to record to show you the final result, the display didn’t recognized the SD card anymore – we’re not sure if it’s a problem with the SD card holder that doesn’t establish a proper connection with the SD card. However, we are sure these instructions work, because we’ve tested them.

In this guide we’ve shown you how to use the 1.8 TFT display with the Arduino: display text, draw shapes and display images. You can easily add a nice visual interface to your projects using this display.

Last week, I ordered this 5-inch touch display with a resolution of 800×480 pixels. I was curious to see how it would work with a Raspberry Pi and to what GLSL Hacker demos would look like.

The USB cable for the touch controller (on the right) must be connected to one of the Raspberry Pi USB ports. The USB power cable (on the left) can be connected to a USB power supply or directly to a free USB port of the Raspberry Pi. If you decide to plug all USB cables on the Raspberry Pi board, you have to edit the /boot/config.txt and turn on high current USB capability:

When you connect the 5-inch display the first time, the default resolution of 640×480 is used. Once again, you have to edit the /boot/config.txt file to set correct parameters for the display:

I tested some GLSL Hacker demos for Raspberry Pi (OpenGL ES 2.0) that are included in the code sample pack of GLSL Hacker (in the gles2/ folder). But before launching the demos, you have to edit them and change the resolution to 800×480 in the main XML file. Alternatively, you can force a particular resolution with the command line:

And the touch function? Don’t expect to have the same touch level than on you smartphone. The touch works on the desktop to select things, but I didn’t manage to move a window with my finger. And in a GLSL Hacker demo, the touch does not work. Maybe I need to install a special version of Raspbian with some built-in touchscreen support…