While I'm waiting for a couple of parts for the weather station I decided to have a play with a larger LED display. This one is made up with four units each with 8 LEDs across and 8 LEDs down so the whole matrix is 32 x 8. Total size 5 x 1.25 inches (128 x 31mm). Each LED is addressable so, with a bit of programming, it can show simple graphics, letters and numbers. My first attempt was an abject failure to show anything but the next day I found I had the two data connections reversed. Once put right it sprang into life. The shapes of letters and numbers have to be defined in the program. That took a while to investigate and remember from school days how to use arrays to store information and how to retrieve and display it. The letters came from a program on the internet but the numbers I had to design myself.
This is the display, driven by an Arduino Uno R3 and powered by a 5V battery:
So far just a test program to get everything working as I want. My aim is to add one more part to measure temperature so I end up with an electronic thermometer I can read from across the room.
As you can see, the Arduino driven turntable I made quite some while ago is still working.
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