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Elegoo EL-SM-004 UNO R3 2.8 Inches TFT Touch Screen with SD Card Socket w/All Technical Data in CD for Arduino UNO R3
- Make sure this fits by entering your model number.
- Free tutorial in cd, better price, better service. (With technical data)
- 2.8 inches colorful display lcd screen
- With touch pen inside, you can use it more easily
- Not including the uno R3 controller board and usb cable
- We have always cared about the customer experience and improve the product function details
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This 2.8 inch TFT Touch Screen is a professional and practical for UNO R3, TFT touch screen with SD card socket, can be used for Arduino board module.
（1）Compatible with Arduino UNO and Mega2560, and can be connected directly by inserting the pin into the interface without wire.
（2) Compatible with all kinds of 5V or 3V MCU with 5V-3.3V change-over circuit.
（3）320X240 HD resolution, can be used as a touch screen.
（4）Adopting 8-bit parallel bus, quicker and smoother refresh than SPI.
（5）Offer support with Arduino libraries, simplify program development.
（6）With Micro-SD card circuit, easy to expand the scope of the test.
1pcs 2.8 Inches TFT LCD Touch Screen
1pcs touch pen
1pcs CD with tutorial
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Seller Warranty Descriptionhalf year warranty on parts and labor
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Update: I really enjoy this display now that I've played with it for a while. The only issue I have with it is that it totally occupies the access to all of the Arduino board pins. I'll have to look at it some more to see which pins the display is actually using and which ones are still available for additional I/O. In the meantime, I mounted it on a pair of pin breakout strips that give me access to all the pins while still allowing the display to seat properly and use whatever pins it needs. This is great for prototyping projects for now. I just ordered two more of these displays because it's such a bargain for the performance it provides.
Yet another update:
I just went through all of the pins marked on the board and the code for the support libraries. It appears that the display hogs all of the pins with the exception of the A5 and the serial I/O pins 0 and 1. This pretty much precludes the use of any other peripheral devices using Wire, SPI, or I2C. The SD card uses digital pins 10 through 13, so if you don't need the SD card, you can snip those pins off (and don't include the SD library in your project). Otherwise the options are limited.
And yet another update:
The thing also hogs the interrupts. It works much better on a Mega 2650 board with the additional I/O pins, but any libraries that use interrupts are crippled. I've downgraded my rating to 3 stars because without sufficient technical documentation from Elegoo this thing is nothing more than a novelty.
This display plugs directly into an UNO without any external wiring. Since most shields that work with an UNO are useable with a MEGA, this display COULD work with a MEGA if you did some external wiring. That's because the wiring for the SPI bus is different between the UNO and MEGA. If you didn't need the SD card which requires the SPI bus, maybe no external wiring is needed. I didn't try this display on a MEGA. You have to provide your own SD card if you want to use one.
I ran into the SPI difference some time ago and was able to add a couple of jumpers and change a few pin numbers and get things to work. Since this display "covers" all of the pins, you'd have to "hot wire" the jumpers, probably not a big deal. If nothing else, the provided sketch using the SD card would be a good reference for using an SD card.
I don't have a designated use for the display yet, but I'm thinking that it should also work with an Arduino UNO 101 which has an onboard Bluetooth interface. That way, one could communicate, wirelessly, like with a phone app.