This piano-liked thing is what I called touch sticky note. I Use a piece of sponge as the paper, and put 8 x 8 LEDs under the sponge. Whenever I touch the touch screen, the related LED will turn on, and this is how I write for the sponge.
I got the idea from the traditional sticky notes. Normally, a piece of sticky note has a very short life and can only be used for one time, so I was thinking how to make a piece of sticky note live longer, and then the idea of touch sticky notes came to my mind.
Step 1: Supplies
– Soldering tool and solder
– Leg cutter for cutting legs of LEDs
– Utility Knife
– 3D Printer (Optional)
Step 2: Setup the LED matrix
I highly recommend soldering the LEDs at the very beginning, and then do other parts of the matrix. If you unfortunately did chip holders and chips before the LEDs, there is also a way to solder LEDs. You have to take the chip out of the chip holder first, and solder the LEDs every carefully, and then put the chip back.
Soldering is a time-consuming work, but it’s very important, because it can determine the performance of the final project.
After finishing the solder, you can use a code to text the matrix. I put two codes here for you to test. The first one is for testing whether the LEDs can light or not, and another one is for testing whether you can use matrix to control each LEDs or not.