Pixelstick

• my pixelstick using arduino and library NeoPixel
• in this version it can read commands from SD card or receive color data via blueteeth

Pin define

• SD card attached as follows:

  • MOSI - pin 11
  • MISO - pin 12
  • CLK - pin 13
  • CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)

• PixelStick Data Pin 6

• Bluetooth

  • RX --> Arduino TX1
  • TX --> Arduino RX0
  • baudrate: 115200(default)
  • soft serial performs not so well at 115200, so use hard serial please

Arduino Interface

• PixelStick
• Version: 1.0.2 https://github.com/hankso/MyPixelStick
• Usage: [options ...]
• Options:
  • run: start displaying photos from command files if SD is inserted
  • stop: stop displaying
  • push: start sending data via serial (HardwareSerial | Bluetooth)
  • time: set time-duration (e.g. 'time-10'|'time+50'|'time=20')
  • ls: print a tree structure of files in SD card
  • ips: interactive pixelstick. control pixels in format (i r g b)
  • next: run next cmd file in SD card
  • prev: run previous cmd file
  • clear: set all pixels off
  • pixel: set num of pixels (e.g. 'pixel 30'|'pixel 50')

(latest version test result is in file "Serial Monitor")

Data format

• Command file should have header and end like this:

  • #file.txt# // '#' + filename + '#'
  • uint32_t data
  • uint32_t data
  • ......
  • -1-1-1-1... // more than two -1 for ensurance

• serial.parseInt() will return '0' if timeout, which may be misunderstanded as '0 0 0 0', so use '-1' as an indicator of end.

class Adafruit_NeoPixel

• void
  • begin(void)
  • show(void)
  • setPin(uint8_t p)
  • setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
  • setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w)
  • setPixelColor(uint16_t n, uint32_t c)
  • setBrightness(uint8_t)
  • clear()
  • updateLength(uint16_t n)
  • updateType(neoPixelType t)
• uint8_t
  • getPixels(void) const,
  • getBrightness(void) const;
• int8_t
  • getPin(void) { return pin; };
• uint16_t
  • numPixels(void) const;
• static uint32_t
  • Color(uint8_t r, uint8_t g, uint8_t b),
  • Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w);
• uint32_t
  • getPixelColor(uint16_t n) const;

printf

There doesn't exist printf("%d",int) in arduino... In order not to use:

sprintf (buffer, "you send %d something here", foo);
Serial.print (buffer);

I add some code to $ARDUINO_DIR/hardware/arduino/cores/Print.h.

More details at http://playground.arduino.cc/Main/Printf

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TODO: acceleration sensor such as 'MMA7631' to change the t_Step(time step)

i.e. horizontal pixel interval of an image