The above LED cube [VoxCube] is being controlled via a Raspberry Pi, using python and the official Raspberry Pi display.
Buttons were setup using the Kivy. Kivy is a Python library which makes creating buttons and events with a touchscreen very easy.
Here is a very good guide on how to get Kivy setup on a Raspberry Pi.
Here is a summary of the what I did to get Kivy going;
pi@raspberrypi ~ $ sudo apt-get update
pi@raspberrypi ~ $ sudo nano /etc/apt/sources.list
Add the below text to the bottom of the file;
deb http://vontaene.de/raspbian-updates/ . main
pi@raspberrypi ~ $ gpg -a –export 0C667A3E | sudo apt-key add –
pi@raspberrypi ~ $ sudo apt-get -y install pkg-config libgl1-mesa-dev libgles2-mesa-dev python-pygame python-setuptools libgstreamer1.0-dev git-core gstreamer1.0-plugins-{bad,base,good,ugly} gstreamer1.0-{omx,alsa} python-dev
pi@raspberrypi ~ $ wget https://bootstrap.pypa.io/get-pip.py
pi@raspberrypi ~ $ sudo python get-pip.py
pi@raspberrypi ~ $ sudo apt-get install python-pip python-dev
pi@raspberrypi ~ $ wget http://pypi.python.org/packages/source/C/Cython/Cython-0.20.tar.gz
pi@raspberrypi ~ $ tar xvzf Cython-0.20.tar.gz Cython-0.20/
pi@raspberrypi ~ $ cd Cython-0.16/
pi@raspberrypi ~/Cython-0.16 $ sudo python setup.py install
pi@raspberrypi ~/Cython-0.16 $ cd ~
pi@raspberrypi ~ $ git clone https://github.com/kivy/kivy
pi@raspberrypi ~ $ cd kivy/
pi@raspberrypi ~/kivy$ python setup.py build
How does it work?
The cube has an onboard ATmega which is used to control the LEDs.
The Raspberry Pi communicates with the ATmega via bit banning.
One pins is used to inform the ATmega to show LEDs.
Another pin is used to tell the ATmega to read the values of the RGB, LED number pins on the Raspberry Pi. The image below gives a high level few of how this is done; click on the image for a larger version
The code below was used;
import kivy kivy.require('1.0.6') # replace with your current kivy version ! from kivy.app import App from kivy.uix.button import Button from kivy.uix.togglebutton import ToggleButton from kivy.uix.gridlayout import GridLayout from kivy.uix.image import Image from kivy.uix.slider import Slider from kivy.clock import Clock from kivy.graphics import Color, Rectangle import RPi.GPIO as GPIO import time from math import cos,sin PI = 3.14159265359 TOTALCUBES = 1 TOTAL_LEDS = TOTALCUBES*512 SNAKE = 1 CUBE = 0 mode = CUBE demo = 1 OUTPIN1 = 6 #GREEN OUTPIN2 = 5 #GREEN OUTPIN3 = 22 #GREEN OUTPIN4 = 27 #GREEN OUTPIN5 = 10 #GREEN OUTPIN6 = 9 #RED OUTPIN7 = 11 #RED OUTPIN8 = 7 #RED OUTPIN9 = 12 #RED OUTPIN10 = 16 #RED OUTPIN11 = 20 #BLUE OUTPIN12 = 21 #BLUE OUTPIN13 = 26 #BLUE OUTPIN14 = 19 #BLUE OUTPIN15 = 13 OUTPIN16 = 14 #LED Number OUTPIN17 = 23 #LED Number OUTPIN18 = 24 #LED Number OUTPIN19 = 25 #LED Number OUTPIN20 = 8 #LED Number OUTPIN21 = 1 #LED Number OUTPIN22 = 4 #LED Number OUTPIN23 = 3 #LED Number OUTPIN24 = 2 #reset OUTPIN25 = 15 # RXD OUTPIN26 = 0 SENDING = 17 SHOW = 18 #used to color snake sine30_3 = [ [18, 29, 0], [21, 28, 0], [23, 27, 0], [26, 25, 0], [27, 22, 0], [29, 19, 0], [29, 16, 0], [29, 13, 0], [29, 10, 0], [27, 7, 2], [26, 4, 3], [23, 2, 6], [21, 1, 8], [18, 0, 11], [15, 0, 15], [11, 0, 16], [8, 1, 17], [6, 2, 18], [3, 4, 17], [2, 7, 16], [0, 10, 15], [0, 13, 12], [0, 15, 9], [0, 18, 6], [0, 21, 4], [0, 23, 5], [0, 26, 11], [0, 27, 15], [0, 29, 15], [0, 29, 15], [0, 29, 8]] cubePosition = [[3,3,3],[4,3,3],[3,4,3],[4,4,3],[3,3,4],[4,3,4],[3,4,4],[4,4,4]] #Cube has 8 LEDs. Each array element is XYZ snakePosition = [[3,3,3],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0],[0,0,0]] #Array used for snake. Each elements XYZ Cposition = 0 def showLED(): #used to show LED updates to cube GPIO.output(SHOW, GPIO.LOW) time.sleep(0.03) GPIO.output(SHOW, GPIO.HIGH) time.sleep(0.02) def updateLed(LEDnumber,r,g,b): #Converts all the needed data to a 16 bit value that gets sent to the cube. combinedData = 0; combinedData = r; combinedData += g <<5; combinedData += b <<10; combinedData += LEDnumber << 15; send16bites(combinedData,30); def updateLEDGrid(x, y, z, r, g, b): #Update LEDs based on grid coordinates rather than just LED number show = 1; if (x>7 or x<0) : #These lines make sure that we only light a LED within the CUBE show = 0 if(y>7 or y<0): show = 0 if(z>((TOTALCUBES*8)-1) or z<0): show = 0; if(show==1): LEDnumber = 0; if (y % 2): #Every second Y horizontal is in reverse x = 7-x LEDnumber = x + (y * 8) + (z * 64) updateLed(LEDnumber,r,g,b) def send16bites(data, sendDelay): GPIO.output(OUTPIN1, GPIO.HIGH) if ((data >> 0) & 0x01) else GPIO.output(OUTPIN1, GPIO.LOW) GPIO.output(OUTPIN2, GPIO.HIGH) if ((data >> 1) & 0x01) else GPIO.output(OUTPIN2, GPIO.LOW) GPIO.output(OUTPIN3, GPIO.HIGH) if ((data >> 2) & 0x01) else GPIO.output(OUTPIN3, GPIO.LOW) GPIO.output(OUTPIN4, GPIO.HIGH) if ((data >> 3) & 0x01) else GPIO.output(OUTPIN4, GPIO.LOW) GPIO.output(OUTPIN5, GPIO.HIGH) if ((data >> 4) & 0x01) else GPIO.output(OUTPIN5, GPIO.LOW) GPIO.output(OUTPIN6, GPIO.HIGH) if ((data >> 5) & 0x01) else GPIO.output(OUTPIN6, GPIO.LOW) GPIO.output(OUTPIN7, GPIO.HIGH) if ((data >> 6) & 0x01) else GPIO.output(OUTPIN7, GPIO.LOW) GPIO.output(OUTPIN8, GPIO.HIGH) if ((data >> 7) & 0x01) else GPIO.output(OUTPIN8, GPIO.LOW) GPIO.output(OUTPIN9, GPIO.HIGH) if ((data >> 8) & 0x01) else GPIO.output(OUTPIN9, GPIO.LOW) GPIO.output(OUTPIN10, GPIO.HIGH) if ((data >> 9) & 0x01) else GPIO.output(OUTPIN10, GPIO.LOW) GPIO.output(OUTPIN11, GPIO.HIGH) if ((data >> 10) & 0x01) else GPIO.output(OUTPIN11, GPIO.LOW) GPIO.output(OUTPIN12, GPIO.HIGH) if ((data >> 11) & 0x01) else GPIO.output(OUTPIN12, GPIO.LOW) GPIO.output(OUTPIN13, GPIO.HIGH) if ((data >> 12) & 0x01) else GPIO.output(OUTPIN13, GPIO.LOW) GPIO.output(OUTPIN14, GPIO.HIGH) if ((data >> 13) & 0x01) else GPIO.output(OUTPIN14, GPIO.LOW) GPIO.output(OUTPIN15, GPIO.HIGH) if ((data >> 14) & 0x01) else GPIO.output(OUTPIN15, GPIO.LOW) GPIO.output(OUTPIN16, GPIO.HIGH) if ((data >> 15) & 0x01) else GPIO.output(OUTPIN16, GPIO.LOW) GPIO.output(OUTPIN17, GPIO.HIGH) if ((data >> 16) & 0x01) else GPIO.output(OUTPIN17, GPIO.LOW) GPIO.output(OUTPIN18, GPIO.HIGH) if ((data >> 17) & 0x01) else GPIO.output(OUTPIN18, GPIO.LOW) GPIO.output(OUTPIN19, GPIO.HIGH) if ((data >> 18) & 0x01) else GPIO.output(OUTPIN19, GPIO.LOW) GPIO.output(OUTPIN20, GPIO.HIGH) if ((data >> 19) & 0x01) else GPIO.output(OUTPIN20, GPIO.LOW) GPIO.output(OUTPIN21, GPIO.HIGH) if ((data >> 20) & 0x01) else GPIO.output(OUTPIN21, GPIO.LOW) GPIO.output(OUTPIN22, GPIO.HIGH) if ((data >> 21) & 0x01) else GPIO.output(OUTPIN22, GPIO.LOW) GPIO.output(OUTPIN23, GPIO.HIGH) if ((data >> 22) & 0x01) else GPIO.output(OUTPIN23, GPIO.LOW) GPIO.output(OUTPIN24, GPIO.HIGH) if ((data >> 23) & 0x01) else GPIO.output(OUTPIN24, GPIO.LOW) GPIO.output(OUTPIN25, GPIO.HIGH) if ((data >> 24) & 0x01) else GPIO.output(OUTPIN25, GPIO.LOW) GPIO.output(OUTPIN26, GPIO.HIGH) if ((data >> 25) & 0x01) else GPIO.output(OUTPIN26, GPIO.LOW) GPIO.output(SENDING, GPIO.LOW) GPIO.output(SENDING, GPIO.HIGH) #setup GPIO pins GPIO.setmode(GPIO.BCM) GPIO.setup(OUTPIN1, GPIO.OUT) GPIO.setup(OUTPIN2, GPIO.OUT) GPIO.setup(OUTPIN3, GPIO.OUT) GPIO.setup(OUTPIN4, GPIO.OUT) GPIO.setup(OUTPIN5, GPIO.OUT) GPIO.setup(OUTPIN6, GPIO.OUT) GPIO.setup(OUTPIN7, GPIO.OUT) GPIO.setup(OUTPIN8, GPIO.OUT) GPIO.setup(OUTPIN9, GPIO.OUT) GPIO.setup(OUTPIN10, GPIO.OUT) GPIO.setup(OUTPIN11, GPIO.OUT) GPIO.setup(OUTPIN12, GPIO.OUT) GPIO.setup(OUTPIN13, GPIO.OUT) GPIO.setup(OUTPIN14, GPIO.OUT) GPIO.setup(OUTPIN15, GPIO.OUT) GPIO.setup(OUTPIN16, GPIO.OUT) GPIO.setup(OUTPIN17, GPIO.OUT) GPIO.setup(OUTPIN18, GPIO.OUT) GPIO.setup(OUTPIN19, GPIO.OUT) GPIO.setup(OUTPIN20, GPIO.OUT) GPIO.setup(OUTPIN21, GPIO.OUT) GPIO.setup(OUTPIN22, GPIO.OUT) GPIO.setup(OUTPIN23, GPIO.OUT) GPIO.setup(OUTPIN24, GPIO.OUT) GPIO.setup(OUTPIN25, GPIO.OUT) GPIO.setup(OUTPIN26, GPIO.OUT) GPIO.setup(SENDING, GPIO.OUT) GPIO.setup(SHOW, GPIO.OUT) GPIO.output(OUTPIN1, GPIO.LOW) GPIO.output(OUTPIN2, GPIO.LOW) GPIO.output(OUTPIN3, GPIO.LOW) GPIO.output(OUTPIN4, GPIO.LOW) GPIO.output(OUTPIN5, GPIO.LOW) GPIO.output(OUTPIN6, GPIO.LOW) GPIO.output(OUTPIN7, GPIO.LOW) GPIO.output(OUTPIN8, GPIO.LOW) GPIO.output(OUTPIN9, GPIO.LOW) GPIO.output(OUTPIN10, GPIO.LOW) GPIO.output(OUTPIN11, GPIO.LOW) GPIO.output(OUTPIN12, GPIO.LOW) GPIO.output(OUTPIN13, GPIO.LOW) GPIO.output(OUTPIN14, GPIO.LOW) GPIO.output(OUTPIN15, GPIO.LOW) GPIO.output(OUTPIN16, GPIO.LOW) GPIO.output(OUTPIN17, GPIO.LOW) GPIO.output(OUTPIN18, GPIO.LOW) GPIO.output(OUTPIN19, GPIO.LOW) GPIO.output(OUTPIN20, GPIO.LOW) GPIO.output(OUTPIN21, GPIO.LOW) GPIO.output(OUTPIN22, GPIO.LOW) GPIO.output(OUTPIN23, GPIO.LOW) GPIO.output(OUTPIN24, GPIO.LOW) GPIO.output(OUTPIN25, GPIO.LOW) GPIO.output(OUTPIN26, GPIO.LOW) GPIO.output(SENDING, GPIO.HIGH) GPIO.output(SHOW, GPIO.HIGH) def updateCube(): #Update cube with either a snake or a small 2x2x2 cube. for i in range(0, TOTAL_LEDS): updateLed(i,0,0,0) if mode == CUBE: for i in range(0, 8): updateLEDGrid(cubePosition[ i][0],cubePosition[ i][1],cubePosition[ i][2],sine30_3[Cposition][0],sine30_3[Cposition][1],sine30_3[Cposition][2]) elif mode == SNAKE: for i in range(11): updateLEDGrid(snakePosition[ i][0],snakePosition[ i][1],snakePosition[ i][2],sine30_3[(i*2)+8][0],sine30_3[(i*2)+8][1],sine30_3[(i*2)+8][2]) a = [1,2,3,4,5,6,7,8,9,10] for i in reversed(a): #this cycles the last coordinates through the snake to create the tail. snakePosition[ i][0] = snakePosition[i-1][0] snakePosition[ i][1] = snakePosition[i-1][1] snakePosition[ i][2] = snakePosition[i-1][2] showLED() def circle(x, y, z,rad, r, g, b): for angle in frange(0.0,2*PI,1): updateLEDGrid(int(x + rad*cos(angle)),int(y + rad*sin(angle)),z,r,g,b); showLED() def boom(): #Create an expanding sphere. E.g. explosion for rad in frange(1,11,1): sphere(cubePosition[0][0]+1,cubePosition[0][1]+1,cubePosition[0][2]+1,rad,sine30_3[Cposition][0],sine30_3[Cposition][1],sine30_3[Cposition][2]) for i in range(0, 8): updateLEDGrid(cubePosition[ i][0],cubePosition[ i][1],cubePosition[ i][2],sine30_3[Cposition][0],sine30_3[Cposition][1],sine30_3[Cposition][2]) showLED() for x in range(0, TOTAL_LEDS): updateLed(x,0,0,0) def sphere( x, y, z, rad, r, g, b): for sph in frange(0.0,PI,0.8): for angle in frange(0.0,2*PI,0.3): updateLEDGrid(int(x + rad*cos(angle)*sin(sph)),int(y + rad*sin(angle)*sin(sph)),int(z + rad*cos(sph)),r,g,b) def frange(start, stop, step): angle = start while angle < stop: yield angle angle += step def demo1(): #Fill cube with every 3rd LED being red, green or blue. for x in range(0, TOTAL_LEDS): updateLed(x,0,0,0) leds = [ i for i in range(TOTAL_LEDS)] LEDs1 = leds[::3] LEDs2 = leds[1::3] LEDs3 = leds[2::3] for x in range(0,len(LEDs3)): updateLed(LEDs1[x],15,0,0) updateLed(LEDs2[x],0,15,0) updateLed(LEDs3[x],0,0,15) showLED(); def demo2(): #Fade all LEDs, red, green then blue. for i in range(0, TOTAL_LEDS): updateLed(i,0,0,0) for h in range(0, 15,3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,h,0,0) showLED(); for h in range(15, -1,-3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,h,0,0) showLED(); for h in range(0, 15,3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,0,h,0) showLED(); for h in range(15, -1,-3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,0,h,0) showLED() for h in range(0, 15,3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,0,0,h) showLED() for h in range(15, -1,-3): print "h= %d" % h for i in range(0,TOTAL_LEDS): updateLed(i,0,0,h) showLED() def demo3(): #Create a red and blue plan that scroll across cube xx = 0; for i in range(0, TOTAL_LEDS): updateLed(i,0,0,0) for z in range(0, (TOTALCUBES*8)): for y in range(0, 8): for x in range(0, 8): updateLEDGrid(x,y,z,0,0,30) for zz in range (0,16): for yy in range (0,8): updateLEDGrid(xx,yy,zz,0,30,0) xx+=1 if xx > 7: xx=0 showLED() for i in range(0, TOTAL_LEDS): updateLed(i,0,0,0) xx=7 for z in range((TOTALCUBES*8)-1, -1,-1): for y in range(0, 8): for x in range(0, 8): updateLEDGrid(x,y,z,0,0,30) for zz in range (0,16): for yy in range (0,8): updateLEDGrid(xx,yy,zz,0,30,0) xx-=1 if xx < 0: xx=7 showLED() print "z = %d" % z for i in range(0, TOTAL_LEDS): updateLed(i,0,0,0) xx = 0; def press_callback(obj): global Cposition global mode global demo if obj.text == 'left': print("Left") if mode == CUBE: if cubePosition[0][0]>0: for i in range(0, 8): cubePosition[ i][0]-=1 elif mode == SNAKE: if snakePosition[0][0]>0: snakePosition[0][0]-=1 updateCube() if obj.text == 'right': print("Right") if mode == CUBE: if cubePosition[0][0]<6: for i in range(0, 8): cubePosition[ i][0]+=1 elif mode == SNAKE: if snakePosition[0][0]<7: snakePosition[0][0]+=1 updateCube() if obj.text == 'up': print("Up") if mode == CUBE: if cubePosition[0][1]<6: for i in range(0, 8): cubePosition[ i][1]+=1 elif mode == SNAKE: if snakePosition[0][1]<7: snakePosition[0][1]+=1 updateCube() if obj.text == 'down': print("Down") if mode == CUBE: if cubePosition[0][1]>0: for i in range(0, 8): cubePosition[ i][1]-=1 elif mode == SNAKE: if snakePosition[0][1]>0: snakePosition[0][1]-=1 updateCube() if obj.text == 'back': print("Back") if mode == CUBE: if cubePosition[0][2]<(TOTALCUBES*8)-2: for i in range(0, 8): cubePosition[ i][2]+=1 elif mode == SNAKE: if snakePosition[0][2]<(TOTALCUBES*8)-1: snakePosition[0][2]+=1 updateCube() if obj.text == 'forward': print("Forward") if mode == CUBE: if cubePosition[0][2]>0: for i in range(0, 8): cubePosition[ i][2]-=1 elif mode == SNAKE: if snakePosition[0][2]>0: snakePosition[0][2]-=1 updateCube() if obj.text == 'boom': print("Boom") boom() updateCube() if obj.text == ' LED\n colour ': print("LED Colour") if Cposition < len(sine30_3)-1: Cposition+=1 else: Cposition = 0 updateCube() if obj.text == 'clear': print("Clear") for x in range(0, TOTAL_LEDS): updateLed(x,0,0,0) showLED() if obj.text == 'mode': print("Mode") if mode == SNAKE: mode = CUBE else: mode = SNAKE updateCube() if obj.text == 'demo1': print("Demo1") demo1() if obj.text == 'demo2': print("Demo2") demo2() if obj.text == 'demo3': print("Demo3") demo3() class MyApp(App): def build(self): layout = GridLayout(size=(600,800), size_hint=(None, None)) #Create our buttons leftButton = Button(text='left',font_size=40,pos=(100,200),background_color=(.6,2,1,1)) rightButton = Button(text='right',font_size=40,pos=(200,200),background_color=(.6,2,1,1) ) upButton = Button(text='up',font_size=40,pos=(150,300),background_color=(.6,2,1,1) ) downButton = Button(text='down',font_size=40,pos=(150,100),background_color=(.6,2,1,1) ) backButton = Button(text='back',font_size=40,pos=(350,300),background_color=(.6,1,2,1) ) forwardButton = Button(text='forward',font_size=40,pos=(300,100),size=(200,100),background_color=(.6,1,2,1) ) LEDcolourButton = Button(text=' LED\n colour ',pos=(650,300),font_size=30,background_color=(1,0,0,1) ) boomButton = Button(text='boom',pos=(650,200),font_size=30,background_color=(1,0,0,1) ) clearButton = Button(text='clear',pos=(650,30),font_size=30,background_color=(1,0,0,1) ) modeButton = Button(text='mode',pos=(520,30),font_size=30,background_color=(1,1,0,1) ) demo1Button = Button(text='demo1',pos=(520,130),font_size=30,background_color=(1,1,0,1) ) demo2Button = Button(text='demo2',pos=(520,230),font_size=30,background_color=(1,1,0,1) ) demo3Button = Button(text='demo3',pos=(520,330),font_size=30,background_color=(1,1,0,1) ) #Bind the call backs leftButton.bind(on_press=press_callback) rightButton.bind(on_press=press_callback) upButton.bind(on_press=press_callback) downButton.bind(on_press=press_callback) backButton.bind(on_press=press_callback) forwardButton.bind(on_press=press_callback) LEDcolourButton.bind(on_press=press_callback) boomButton.bind(on_press=press_callback) clearButton.bind(on_press=press_callback) modeButton.bind(on_press=press_callback) demo1Button.bind(on_press=press_callback) demo2Button.bind(on_press=press_callback) demo3Button.bind(on_press=press_callback) #Add the widgets layout.add_widget(leftButton) layout.add_widget(rightButton) layout.add_widget(upButton) layout.add_widget(downButton) layout.add_widget(backButton) layout.add_widget(forwardButton) layout.add_widget(LEDcolourButton) layout.add_widget(boomButton) layout.add_widget(clearButton) layout.add_widget(modeButton) layout.add_widget(demo1Button) layout.add_widget(demo2Button) layout.add_widget(demo3Button) return layout if __name__ == '__main__': MyApp().run() for i in range(0,100): #for x in range(0, 1023): updateLed(1,13,13,13) showLED() showLED() print "end\n"
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