Concatenation of files for the Grove LED bar controller with the Bean+ project.

grove_led_bar_with_rotary_controller.ino

/*  This is a concatenation of the following files from
    https://github.com/Seeed-Studio/Grove_LED_Bar (LGPL):
      - Grove_LED_Bar.h
      - Grove_LED_Bar.cpp (less the #include for the above header)
    and the code from
    https://www.hackster.io/karel/grove-led-bar-controller-with-the-bean-c3b81e
    (less the #include for the above header) with corrections from the
    comments. */


// Start of Grove_LED_Bar.h


/*
  LED bar library V2.0
  2010 Copyright (c) Seeed Technology Inc.  All right reserved.

  Original Author: LG

  Modify: Loovee, 2014-2-26
  User can choose which Io to be used.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
/*
  Modify: Long, 2015-01-07
  User can change the brightness level for each LED segment
  Rename constant to avoid name conflict
*/
#ifndef Grove_LED_Bar_H
#define Grove_LED_Bar_H

#include <Arduino.h>

// Avoid name conflict
#define GLB_CMDMODE 0x00  // Work on 8-bit mode
#define GLB_ON      0xff  // 8-bit 1 data
#define GLB_OFF     0x00  // 8-bit 0 data

class Grove_LED_Bar
{

private:

  unsigned int __pinClock;  // Clock pin
  unsigned int __pinData;   // Data pin
  bool __greenToRed;        // Orientation (0 = red to green, 1 = green to red)
  unsigned char __state[10];// Led state, brightness for each LED

  void sendData(unsigned int data);  // Send a word to led bar
  void latchData(void);              // Load data into the latch register
  void setData(unsigned char bits[]);//Set data array

public:

  Grove_LED_Bar(unsigned char pinClock, unsigned char pinData, bool greenToRed);  // Initialize
  void begin(){pinMode(__pinClock, OUTPUT); pinMode(__pinData, OUTPUT);}
  void setGreenToRed(bool greenToRed);             // (Re)set orientation
  void setLevel(float level);                      // Set level, range from 0 to 10
  void setLed(unsigned char led, float brightness);// Set brightness for a single led, range from 0 to 1
  void toggleLed(unsigned char led);               // Toggle a single led
  void setBits(unsigned int bits);                 // Toggle leds to match given bits
  unsigned int const getBits();                    // Get the current state
};

#endif


// End of Grove_LED_Bar.h


// Start of Grove_LED_Bar.cpp


/*
  LED bar library V2.0
  2010 Copyright (c) Seeed Technology Inc.  All right reserved.

  Original Author: LG

  Modify: Loovee, 2014-2-26
  User can choose which Io to be used.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

// #include "Grove_LED_Bar.h"

Grove_LED_Bar::Grove_LED_Bar(unsigned char pinClock, unsigned char pinData, bool greenToRed)
{
  __pinClock = pinClock;
  __pinData = pinData;
  __greenToRed = greenToRed;  // ascending or decending

  for (byte i = 0; i < 10; i++)
    __state[i] = 0x00;  // persist state so individual leds can be toggled

  pinMode(__pinClock, OUTPUT);
  pinMode(__pinData, OUTPUT);
}


// Send the latch command
void Grove_LED_Bar::latchData()
{
  digitalWrite(__pinData, LOW);
  delayMicroseconds(10);

  for (unsigned char i = 0; i < 4; i++)
  {
    digitalWrite(__pinData, HIGH);
    digitalWrite(__pinData, LOW);
  }
}


// Send 16 bits of data
void Grove_LED_Bar::sendData(unsigned int data)
{
  for (unsigned char i = 0; i < 16; i++)
  {
    unsigned int state = (data & 0x8000) ? HIGH : LOW;
    digitalWrite(__pinData, state);

    state = digitalRead(__pinClock) ? LOW : HIGH;
    digitalWrite(__pinClock, state);

    data <<= 1;
  }
}


// Change the orientation
// Green to red, or red to green
void Grove_LED_Bar::setGreenToRed(bool greenToRed)
{
  __greenToRed = greenToRed;

  setData(__state);
}


// Set level (0-10)
// Level 0 means all leds off
// Level 10 means all leds on
// Level 4.5 means 4 LEDs on and the 5th LED's half on
void Grove_LED_Bar::setLevel(float level)
{
  level = max(0, min(10, level));
  level *= 8; // there are 8 (noticable) levels of brightness on each segment
  
  // Place number of 'level' of 1-bits on __state
  for (byte i = 0; i < 10; i++) {
    __state[i] = (level > 8) ? ~0 :
                 (level > 0) ? ~(~0 << byte(level)) : 0;
               
    level -= 8;
  };

  setData(__state);
}


// Set a single led
// led (1-10)
// brightness (0-1)
void Grove_LED_Bar::setLed(unsigned char led, float brightness)
{
  led = max(1, min(10, led));
  brightness = max(0, min(brightness, 1));

  // Zero based index 0-9 for bitwise operations
  led--;

  // 8 (noticable) levels of brightness
  // 00000000 darkest
  // 00000011 brighter
  // ........
  // 11111111 brightest
  __state[led] = ~(~0 << (unsigned char) (brightness*8));

  setData(__state);
}


// Toggle a single led
// led (1-10)
void Grove_LED_Bar::toggleLed(unsigned char led)
{
  led = max(1, min(10, led));

  // Zero based index 0-9 for bitwise operations
  led--;

  __state[led] = __state[led] ? 0 : ~0;

  setData(__state);
}

// each element in the state will hold the brightness level
// 00000000 darkest
// 00000011 brighter
// ........
// 11111111 brightest
void Grove_LED_Bar::setData(unsigned char __state[])
{

  sendData(GLB_CMDMODE);

  for (unsigned char i = 0; i < 10; i++)
  {
    if (__greenToRed)
    {
	  // Go backward on __state
      sendData(__state[10-i-1]);
    }
    else
    {
	  // Go forward on __state
      sendData(__state[i]);
    }
  }

  // Two extra empty bits for padding the command to the correct length
  sendData(0x00);
  sendData(0x00);

  latchData();
}

void Grove_LED_Bar::setBits(unsigned int bits)
{

  for (unsigned char i = 0; i < 10; i++)
  {

    if ((bits % 2) == 1)
      __state[i] = 0xFF;
    else
      __state[i] = 0x00;
    bits /= 2;
  }

  setData(__state);
}


// Return the current bits
unsigned int const Grove_LED_Bar::getBits()
{
  unsigned int __bits = 0x00;
  for (unsigned char i = 0; i < 10; i++)
  {
    if (__state[i] != 0x0)
        __bits |= (0x1 << i);
  }
  return __bits;
}


// End of Grove_LED_Bar.cpp


// Start of grove_led_bar_with_rotary_controller.ino

#define ROTARY_ANGLE_SENSOR A3 // The input pin used for the sensor
#define ADC_REF 5 // This matches the operating voltage we set to 5V
#define GROVE_VCC 5 // VCC of the grove interface which is often 5V
#define NUM_OF_LEDS 10 // Number of LEDs in the LED bar

// #include <Grove_LED_Bar.h>

Grove_LED_Bar LEDbar(A4, A5, 1); // Setting the data and clock pins used

void setup() 
{
  pinMode(ROTARY_ANGLE_SENSOR, INPUT);
  LEDbar.begin();
}


void loop()
{
  // Set the number of LEDs to turn on based upon the angle of the rotary
  // sensor
  LEDbar.setLevel(getLightLevel());
  delay(100);
}


int getLightLevel()
{
  // Take reading, measure voltage, and calculate 
  // number of LEDs which should be turned on
  int reading = analogRead(ROTARY_ANGLE_SENSOR); 
  float voltage = (float)reading*ADC_REF/1023;
  float level = (voltage*NUM_OF_LEDS)/GROVE_VCC;
  return level;
}


// End of grove_led_bar_with_rotary_controller.ino