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Analogue clock using Electric Imp and Neopixels
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const NEOPIXELS_BYTESPERPIXEL = 24; | |
class NeoPixels { | |
// Driver for the World Semi WS2812 - aka Adafruit NeoPixel | |
// By Matt Haines (@beardedinventor) | |
// See https://electricimp.com/docs/resources/neopixels/ | |
// Availibility: Device | |
// Copyright 2014 Electric Imp | |
// Issued under the MIT license (MIT) | |
// Permission is hereby granted, free of charge, to any person obtaining a copy | |
// of this software and associated documentation files (the "Software"), to deal | |
// in the Software without restriction, including without limitation the rights | |
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
// copies of the Software, and to permit persons to whom the Software is | |
// furnished to do so, subject to the following conditions: | |
// The above copyright notice and this permission notice shall be included in | |
// all copies or substantial portions of the Software. | |
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
// THE SOFTWARE. | |
// This class uses SPI to emulate the newpixels' one-wire protocol. | |
// This requires one byte per bit to send data at 7.5 MHz via SPI. | |
// These consts define the "waveform" to represent a zero or one | |
ZERO = 0xC0; | |
ONE = 0xF8; | |
// when instantiated, the neopixel class will fill this array with blobs to | |
// represent the waveforms to send the numbers 0 to 255. This allows the blobs to be | |
// copied in directly, instead of being built for each pixel - which makes the class faster. | |
bits = null; | |
// Like bits, this blob holds the waveform to send the color [0,0,0], to clear pixels faster | |
clearblob = blob(12); | |
// private variables passed into the constructor | |
spi = null; // imp SPI interface (pre-configured) | |
frameSize = null; // number of pixels per frame | |
frame = null; // a blob to hold the current frame | |
pixelWriter = null; | |
writeFrame = null; | |
// _spi - A configured spi (MSB_FIRST, 7.5MHz) | |
// _frameSize - Number of Pixels per frame | |
constructor(_spi, _frameSize) { | |
this.spi = _spi; | |
this.frameSize = _frameSize; | |
this.frame = blob(frameSize*NEOPIXELS_BYTESPERPIXEL + 1); | |
this.frame[frameSize*NEOPIXELS_BYTESPERPIXEL] = 0; | |
local spiWriter = _spi.write.bindenv(_spi); | |
local refFrame = frame; | |
// writes the frame buffer to the pixel strip | |
// ie - this function changes the pixel strip | |
this.writeFrame = function() { | |
spiWriter(refFrame); | |
} | |
// prepare the bits array and the clearblob blob | |
initialize(); | |
clearFrame(); | |
writeFrame(); | |
local frameSeeker = frame.seek.bindenv(frame); | |
local frameWriter = frame.writeblob.bindenv(frame); | |
local refBits = bits; | |
this.pixelWriter = function(p, r,g,b) { | |
frameSeeker(p*NEOPIXELS_BYTESPERPIXEL); | |
// red and green are swapped for some reason, so swizzle them back | |
frameWriter(refBits[g]); | |
frameWriter(refBits[r]); | |
frameWriter(refBits[b]); | |
} | |
} | |
// fill the array of representative 1-wire waveforms. | |
// done by the constructor at instantiation. | |
function initialize() { | |
// fill the bits array first | |
bits = array(256); | |
for (local i = 0; i < 256; i++) { | |
local valblob = blob(NEOPIXELS_BYTESPERPIXEL / 3); | |
valblob.writen((i & 0x80) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x40) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x20) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x10) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x08) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x04) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x02) ? ONE:ZERO,'b'); | |
valblob.writen((i & 0x01) ? ONE:ZERO,'b'); | |
bits[i] = valblob; | |
} | |
// now fill the clearblob | |
for(local j = 0; j < NEOPIXELS_BYTESPERPIXEL; j++) { | |
clearblob.writen(ZERO, 'b'); | |
} | |
} | |
// sets a pixel in the frame buffer | |
// but does not write it to the pixel strip | |
// color is an array of the form [r, g, b] | |
function writePixel(p, color) { | |
pixelWriter(p, color[0], color[1], color[2]); | |
} | |
// Clears the frame buffer | |
// but does not write it to the pixel strip | |
function clearFrame() { | |
frame.seek(0); | |
for (local p = 0; p < frameSize; p++) frame.writeblob(clearblob); | |
} | |
} | |
const NUM_PIXELS = 60 | |
spi <- hardware.spi257 | |
spi.configure(MSB_FIRST, 7500) | |
local pixel = NeoPixels(spi, NUM_PIXELS) | |
local pixelWriter = pixel.pixelWriter; | |
local frameWriter = pixel.writeFrame; | |
server.log(imp.getsoftwareversion() + " / " + imp.getmacaddress()) | |
server.disconnect(); | |
local background = [0,0,0]; | |
local gettime = time; | |
local impwaker = imp.wakeup.bindenv(imp); | |
local function proximity(a, b, limit) { | |
local diff = a-b; | |
if (diff < 0) { | |
diff = -diff; | |
} | |
if (diff > 30) { | |
diff = 60 - diff | |
} | |
if (diff <= limit) { | |
return (limit != 0) ? 1.0 - diff / limit : 1 | |
} | |
return 0 | |
} | |
local displaytime; | |
displaytime = function(){ | |
local now = gettime(); | |
local hour = (now/3600)%12; | |
local min = (now/60)%60; | |
local sec = now%60; | |
local hourled = (hour + 0) * 5 + (min / 12.0) + (sec/720.0) | |
local minled = min + (sec/60.0) | |
local bgred = background[0]; | |
local bggreen = background[1]; | |
local bgblue = background[2]; | |
for(local i = 0; i<NUM_PIXELS; i++){ | |
local red = bgred, green = bggreen, blue = bgblue; | |
local hourprox, minprox; | |
if (proximity(i, sec, 0)) { | |
red = 100 | |
green = 0 | |
blue = 100 | |
} else if ((minprox = proximity(i, minled, 2.0)) != 0) { | |
red = 0 | |
green = (100 * minprox * minprox) | |
blue = (100 * minprox * minprox) | |
} else if ((hourprox = proximity(i, hourled, 3.0)) != 0) { | |
red = (100 * hourprox * hourprox) | |
green= (100 * hourprox * hourprox) | |
blue = 0 | |
} | |
pixelWriter(i,red,green,blue); | |
} | |
frameWriter(); | |
impwaker(0.1,displaytime) | |
} | |
local getus = hardware.micros.bindenv(hardware); | |
local us = getus(); | |
displaytime() | |
us = getus() - us; | |
local freemem = imp.getmemoryfree(); | |
server.log(us+" "+freemem); |
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