Tag Archives: ST7735

Assembling the keyboard toy (or: shipping an unfinished product)

After much iteration on the firmware for the keyboard, I decided on finally assembling the device, in spite of not being completely finished.  It will continue to be a work-in-progress, but I need to move on to other projects for now.  Once I finish some other projects, I’ll come back to this one.

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Inexpensive TFT

On and off, I’ve been working on a project to build a learning toy for my son.  It started out in various forms, but is now destined to become embedded within an old PS/2 keyboard I’ve had lying around unused for a good while (except as an occasional toddler plaything).  At any rate, I needed a display of some sort to permanently embed in the project, and since it will likely take a beating over time, I wanted it to be fairly inexpensive.  I ended up finding this device on Amazon, and finally received it last week.

Breadboarded display with Pro Trinket

Using Adafruit’s ST7735 library, it works perfectly.  Thanks to the blog post here, I was able to set it up fairly easily.  Here, you can see it hooked up to my Adafruit Pro Trinket.  The only addition I had to make was to insert a LD33CV 3.3V voltage regulator between the Trinket’s power supply and the bread board’s power bus.  The product claims that it has a built-in level shifter, but the data sheets  have conflicting information about this.  Better safe than sorry.  Once the project is more complete, I plan on swapping the Trinket out for a dedicated ATMega328P, and will give it a lower voltage power supply also.