Programmable calculator on Pico DIY

Author	Message
zeitfest Guru Joined: 31/07/2019 Location: Australia Posts: 655	Posted: 01:23pm 28 Mar 2024         Frank N. Furter said   I had built a USB keyboard for an emulator with an Arduino Pro Micro. You are completely free with the matrix! PET2001 KEYBOARD PROJECT Now thats a keyboard ! I had not considered adding a full keyboard, your project has good capabilities there.  At this stage the keypad is intended mainly for number input, programs are written on a PC instead. My experience is, to edit full text on the 3.5 screen requires a small font which can be a problem. The TCA8414 condenses the 6+6 keypad lines to two I2C lines and it scans, does debouncing etc so it is OK so far. It will scan up to  8x10 lines, but not USB, that might be necessary soon.