This is tiny device, powered by single Li-Ion cell, only allowing user to browse directory of files, select particular text file and read it. Two buttons are used to move cursor up/down in directory or to scroll displayed file up and down, middle button is to open/close file. When connected to PC, Li-Ion cell starts to charge (this is terminaed when completed) and device enumerates as mass storage device (USB disk drive), so user can copy thie files here. It works on Win/Linux/Mac with no drivers or any software needed.
You can have shopping list, cheat sheet in here, or use it as the most unusable e-book reader.
Time flies. The last update of this project is from 2014 - while the original microreader is functional, I decided to take another try and implement some ideas gathered from community here and under blog entry here. I like the openspritz idea, see also here. To help with key-less text scrolling, or with openspritz speed adjust, I added accelerometer on board.
The original 1206 inductor in OLED DC/DC converter was changed for inductor with lower height and lower resistance, so it will not protrude that much from board (lower total height) and the power efficiency should go up.
I made minor modifications to original board, to fix bugs from 1.0 version. The pinheader (2.0mm pitch) is just temporary for firmware debugging.
Accelerometer is tested and running, I'll try to port old source files to it.
I can't physically find it in my home workshop. Don't know whether somebody borrowed it or what, but I simply can't find it anymore. Maybe it is somehow related to exceptionally high level of entropy in my workshop (read as "mess") and the fact that microreader is really tiny. If it would be half a meter long, it would be easier to find. Not that I need it very much, but I wanted to attach accelerometer to it and try porting openspritz to it.
evermind. I designed new PCB with accelerometer included on it.
Don't get fooled by picture size - it is actually 42x14,8mm. It is two milimeters wider and one milimeter shorter than original Microreader and should be "embeddable" into 3D printed enclosure, unlinke first microreader, intended as designer's joke with bare PCB. I rectified some design flaws of first version too.
I expect PCB to arrive at the end of next week, key components are already here.
Seems like a lot of people are following this project, so I decided to make Microreader mark 2. I won't change its functionality very much, to keep spirit of small and simple device, but will definitely design new PCB and 3D printable case. Barebones PCB is not very useful for real use.