The first prototype of the device is finally completed! Here's a brief recap of what have been done and what's planned for the future.
- I implemented the feature I wanted the most, that is the multimeter with simultaneous current and voltage measurements, with instant and average power consumption graphs to estimate battery life of my projects
- My nerdiness is quite satisfied by the UI similarity with the Nokia original design
- I love the continuity function playing the Nokia Tune
- I paid a tribute to Sprite_tm with the Tetris addon
- I'm working on a better, more powerful version of the device using the Teensy, with Bluetooth 4.0 smartwatch functions.
- I wrote and published >2000 lines of code, most of the stuff can be reused
- There's now an Open Hardware Eagle library to replicate the Nokia 3310 PCB!
- I spent WAY too much time creating tools to extract the original bitmaps and fonts from the original Nokia Firmware. My inner nerd is very satisfied, but this left me no time to add other interesting functions like the scope, the serial sniffer and the ESP8226 integration before the contest end
- Besides, I have no space left on the Trinket:
- I couldn't get the TVBgone function to work, maybe it's a conflict with the timers used in the Tone library
- The LiIon battery charger I ordered is stuck in a post office somewhere; once I get it, it's just a matter of connecting it to the header and I will be able to charge the Nokia battery from the Trinket's USB port
- I really need a gold plated PCB to get the original Nokia buttons to work decently
- The code to extract the fonts from the original firmware is horrible and not commented
- There's a bit of noise in the input stage. That is due mostly to the long routing of the signals, as some components like the Trinket, the button pads and the backlight LEDs can't be moved around to optimize the board