Joey's Electronics Projects

Makevention went really well! I was able to show everything I have been working on, although I didn't have time to finish everythi...

In August my RPN Scientific Calculator was featured on Hackaday in Hacklet 70 - Calculator Projects . It was really great to see my project...

Hackaday recently started a competition for projects that feature parts made by Atmel, Freescale, Microchip, or Texas Instruments. 50 pri...

The last part of my RPN Scientific Calculator is the keypad. Before, I had considered trying to make individual key labels somehow. If I co...

So I have not updated my blog in a while. Grad school is keeping me pretty busy. Most of what I do with electronics now is related to the l...

After a few months of work, the case for my calculator is finally finished. Back in January I made a post with a picture of the clad I sol...

In the last two months I have made a lot of progress with my calculator. The software is now finished. As well as cleaning up a few bugs ...

As I mentioned in the last post about this project, I added a second MSP430 because the firmware was getting too large. In the end hardware...

The next step for the calculator is the interface. The code for handling input ended up being fairly long but now entering numbers works ...

Recently I was able to get some new components and took the chance to make a few tweaks to the calculator. First of all, I hooked up a new ...

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

After rewriting the multiplication function I started on the division routine. There are several ways to do this. I used the subtract and ...

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 last part of the hardware needed to complete the calculator is external RAM. Even if it does not have any programming capabilities, it ...

The next step of the hardware for my calculator is a keypad. I finished this several weeks ago but I haven't posted anything about it b...

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...