Parts needed for this Arduino Touch ScreenĪs an example I am using a 3.2” TFT Touch Screen in a combination with a TFT LCD Arduino Mega Shield. If you run it, chances are you won't see the expected output on the serial monitor, but as long as it compiled OK, we should be good for now.Now we will go through each of these examples and step by step explain the codes behind them. #define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321Īnd give it a quick Compile. Then comment out this line (16) by prefixing it with two forward slashes:
You'll need to install the Adafruit DHT sensor library as well as its dependency, the Adafruit Unified Sensor library - if you've not done this before, Adafruit has an excellent walk-through. With the libraries installed, we can run another quick test sketch like we did for the LCD: open File->Examples->DHT->DHTtester and uncomment this line (15 at the time of writing) by removing the leading forward slashes: Hook the middle (out) pin on the DHT11 to digital pin 2 on the Arduino, and the + and - pins to 5V and GND respectively. It's not the fastest or most accurate way to measure temperature, but it's cheap, and good enough for our purposes. I'm using the commonly available, inexpensive, DHT11. Now that we know the LCD is working, let's have a look at the temperature. One of the most common numeric values that humans like to glance at is temperature data, so I thought it would be fun to create a simple thermometer using a DHT11 and an Arduino Uno, in order to put the library through its paces. This library redefines the 8 available characters to create Big Number s which each occupy 2x2 characters! As explained in her original blog post, Carrie was inspired by other, larger examples of the same technique, using 3x2 characters. Combining characters in this way revolutionizes LCD usage, since you can now easily take a reading from across the room, making it ideal for at-a-glance data.
Or is it ? By using the 8 available user-defined characters, it's possible to add your own custom glyphs - and if you're clever, you can combine them to completely transform the capabilities of this humble display! Our own resident clever clogs Carrie published the BigNums2x2 library a while back as a byproduct of another project she was working on. 16x2 character LCDs are a great way to add a visual output to an Arduino project, though they are somewhat inflexible in terms of the information that they are able to display - for example, the character size and font is fixed.
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