IVEE and IVEE7 (DIY calculators)

[deetee]

Hello all!

I proudly present IV and IV7 - probably the best RPN calculators I have built so far.

They are based on arduino hardware (avr atmel328) and are programmable (900 steps, FORTH-like).
While IV has an OLED-display IV7 tries to represent numbers and text (yes that's somehow possible) on an 8-digit-7-segment-display.

See some videos on:
https://youtu.be/m1aFRhqvuLM
and
https://youtu.be/uZYgRxXX5ro

Regards
deetee