Reddit reviews ELEGIANT WiFi Internet Development Board NodeMcu Lua ESP8266 ESP-12E
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NodeMcu Lua ESP-12E WIFI Development Board. From 2015/10/1, NodeMCU has been upgraded to a new chip CH340WINDOWS driver USB to serial CH341 / CH340 installation packageSupport WINDOWS 98 / ME / 2000 / XP / Server 2003 / VISTA / Server 2008 / Win7 / Win8 / Win8.1 32 Bit / 64 and MAC Through Microsoft's digital signature authenticationIn the computer end of the USB device emulation as a standard serial devices Serial COMIt contains the serial number and identification CH34X monitoring CH34X equipment swap library. Driver: http://en.doit.am/CH341SER.zip
Gladly! I based my builds on one developed by Ulrich Radig, who makes his source code pretty freely available on his forums and on github. He's got an (older version) assembly and demonstration on that first link, towards the bottom.
Basically, you lay out strips of WS2812 LEDs to form a grid of lights, say 13x13, depending on how many letters wide your clock face needs to be. These LEDs can be controlled individually by a signal from a microprocessor, so you can turn on just the necessary lights instead of the whole strip. For a controller, we use a NodeMCU 12-E or similar ESP-8266 board, which is a low cost (8 euro) microcontroller that also has wifi built into it and which can be programmed in the same manner as an Arduino. You then put a grid between the LEDs to mask the lights and to prevent the light from lighting up the letters around it, since you just want one letter per LED to be lit up. Ulrich used water jet cut foam for his, my first one was cardboard, but I now have a 3d printer and will print something for it. Over the grid, you put a face plate with the letters etched, cut, or painted on it. Ulrich used a silkscreen method on glass. I used painter's tape on a opaque plexiglas, traced and cut out the lettering, then a couple of coats of black spray paint over that. I carefully peeled out the tape and it left a negative of the letter for the light to shine through. This time I'm going to maybe do something nicer, laser cut metal or wood (haven't quite decided). The whole device is run on 5v power, so a simple 2A USB style cell phone charger is all you need for power.
Ulrich did most of the heavy lifting with his code, where he created a sort of library that stores the "addresses" of the LEDs in a big matrix, then created reference functions to the matrix. Calling the function "Es" lights up LEDs numbered 1,2. Calling "ist" lights 4,5, and 6. This is set up for all the other words as well. He also built in a time lookup service to sync the time over the internet, and he included a web server function so you can connect to the clock over wifi and control the colors, brightness, and so on. I have mostly just adapted his code on my previous projects, but I hope to go a little further on this one, to add in a battery powered back up clock module, and if I have time, to refine the web server that Ulrich made.