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Bike POV Beta 3

From Open Source Urbanism

Code for the Arduino Bike POV project

Status: working (use the font.h code from Bike_POV_Beta_2)
Environment: Arduino 0011 (not working on version 12)

Add #include "stdint.h" to get this code to work with Arduino0018

This code has been superseded. Get the latest version here.

//============================================================
// Arduino Bike POV
//
// by Scott Mitchell
// www.openobject.org
// Open Source Urbanism
//
// Copyright (C) 2008 Scott Mitchell 12-10-2008
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// A copy of the GNU General Public License
// can be found at <http://www.gnu.org/licenses/>.
//
// Last Modified: October 12, 2008
//============================================================

// defining the alphabet
#include "font.h"

// define the Arduino LED pins in use
int LEDpins[] = {
  7,6,5,4,3,2,1};

// number of LEDs
int charHeight = sizeof(LEDpins);
int charWidth = 5;

// customizable parameters
int timer1 = 1;			// time between columns
int timer2 = 3;		// time between letters
int timer3 = 10;		// time between strings

// sensor setup
int sensorPIN = 0;  // define the Arduino sensor pin
int mean = 508;  // sensor at rest (no magnet)
int sensitivity = 100;  // sensor sensitivity
boolean sensorFlag = false;  // stores sensor state

char textString[] = "OPEN SOURCE URBANISM";

void setup()
{
  for (int i = 0; i < charHeight; i++)
    pinMode(LEDpins[i], OUTPUT);	// set each pin as an output
}

void loop()
{
  // printing every letter of the textString
  for (int i=0; i<sizeof(textString); i++){
    printLetter(textString[i]);
    if(sensorFlag){
      sensorFlag = false;  // reset the sensor flag
      break;  // restart the text string
    }
  }

  // space between strings
  pauseFrame(timer3);
}

void printLetter(char ch)
{
  byte letter[5];

  // make sure the character is within the alphabet bounds (defined by the font.h file)
  // if it's not, make it a blank character
  if (ch < 32 || ch > 126){
    ch = 32;
  }

  // subtract the space character (converts the ASCII number to the font index number)
  ch -= 32;

  // step through each byte of the character array
  for (int i=0; i<charWidth; i++) {
    byte b = font[ch][i];

    // bit shift through the byte and output it to the pin
    for (int j=0; j<charHeight; j++) {
      digitalWrite(LEDpins[j], !!(b & (1 << j)));
    }

    // space between columns
    pauseFrame(timer1);
  }

  //clear the LEDs
  for (int k=0; k<charHeight; k++) {
    digitalWrite(LEDpins[k], LOW);
  }

  // space between letters
  pauseFrame(timer2);
}

void pauseFrame(int duration){
  int sensVal;  // variable to store the value coming from the sensor
  unsigned long endTime = millis() + duration;  // calculate the end time

  // wait for a while
  while(millis() < endTime){
    // and keep an eye on the sensor
    sensVal = analogRead(sensorPIN);  // read the Hall Effect Sensor
    if (sensVal > (mean + sensitivity) || sensVal < (mean - sensitivity)) {
      sensorFlag = true;  // set the sensor flag variable
      break;  // exit the pause
    }
  }
}