Joey's Electronics Projects

Though I haven't made many posts in the past two years, I have been working on projects slowly but surely. As time passes, I realize how...

Tiny Calculator is business card size. The hardware for this project is finally done! The first step was getting the LCD running. This ...

Since my last post I have made a lot of changes to the CORDIC routines I was working on. As you can see in the chart above, the new vers...

For the trig functions, I started building the same angle table that I used for the CORDIC routines in my RPN Scientific Calculator . Com...

The last few weeks I have gone down a little bit of a rabbit hole writing BCD math routines for my Tiny Calculator project. The goal has be...

My  Pocket Calculator project has been on the back burner for a few months while I finish my master's thesis. In the mean time, I got ...

Recently I got interested in building a very small calculator I can carry around with me. The other calculator projects I worked on are n...

12345.6789 + 9999.99999 packed BCD on 8051 A few years ago I decided to revisit the microcontroller comparison I had done to see how m...

In preparation for the 6502-based calculator I am planning on building, I started thinking about the best way to do BCD multiplication. On...

One of the projects I started on for my Summer Hackathon is a new version of my RPN calculator. This version uses an LPC1114 instead of th...

Back in March I finished the microcontroller comparison of a few chips I was considering using. The 8051 based chips all fared poorly in B...

After finishing the CORDIC routine for logarithms I started on the CORDIC routine for trig functions. For this I needed a different look up...

Work continues on my calculator. Each byte of a BCD number now holds only one digit instead of two. This eliminates the functions that were...

The next step of the software for my calculator is multiplication. In Binary Coded Decimal (BCD) this is fairly straightforward. Every deci...

My interest in electronics started because I would like to build calculators like the ones I used to collect. Now I plan to build a scienti...