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Arturo Corro
2022-06-18 15:10:35 -05:00
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LiquidCrystal/examples/i2cLCDextraIO_tempLeonardo/i2cLCDextraIO_tempLeonardo.ino Normal file
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// ---------------------------------------------------------------------------
// Created by Francisco Malpartida on 1/1/12.
// Copyright 2011 - Under creative commons license:
// Attribution-NonCommercial-ShareAlike CC BY-NC-SA
//
// This software is furnished "as is", without technical support, and with no
// warranty, express or implied, as to its usefulness for any purpose.
//
// Thread Safe: No
// Extendable: Yes
//
// @file i2CLCDextraIO_tempLeonardo.ino
// Temperature logging to demonstrate the I2CLCDextraIO library.
//
// @brief This application is a demostration file for the I2CLCDextraIO library
// that reads a temperature from the internal ATMEGA32U4 temperature sensor
// and displays it on the LCD. The application also demonstrates some of the
// methods of the library, such as loading custom characters to the LCD,
// moving around the LCD, and writing to it.
//
// @author F. Malpartida
// ---------------------------------------------------------------------------
#include <Arduino.h>
#include <Wire.h>
#include <LCD.h>
#define _LCD_SR3W_
#ifdef _LCD_I2C_
#include <LiquidCrystal_I2C.h>
#endif
#ifdef _LCD_4BIT_
#include <LiquidCrystal.h>
#endif
#ifdef _LCD_SR_
#include <LiquidCrystal_SR.h>
#endif
#ifdef _LCD_SR3W_
#include <LiquidCrystal_SR3W.h>
#endif
/*!
@defined CHAR_WIDTH
@abstract Character witdth of the display, expressed in pixeles per character.
*/
#define CHAR_WIDTH 5
/*!
@defined BACKLIGHT_PIN
@abstract LCD backlight pin definition.
@discussion AVR pin used for the backlight illumintation of the LCD.
*/
#define BACKLIGHT_PIN 12
/*!
@defined STATUS_PIN
@abstract Status LED indicator.
@discussion Activity LED blinking indicating that the system is up.
*/
#define STATUS_PIN 13
/*!
@defined LOOP_DELAY
@abstract Main loop delay.
@discussion Main loop delay executing temperature readings and LCD updates.
*/
#define LOOP_DELAY 300
/*!
@defined TEMP_CAL_OFFSET
@abstract Temperature calibration offset.
@discussion This is the offset value that has to be modified to get a
correct temperature reading from the internal temperature sensor
of your AVR.
*/
#define TEMP_CAL_OFFSET 282
/*!
@defined FILTER_ALP
@abstract Low pass filter alpha value
@discussion This value defines how much does the current reading, influences
the over all value. The smaller, the less influence the current
reading has over the overall result.
*/
#define FILTER_ALP 0.1
/*!
@defined MIN_TEMP
@abstract Minimum temperature range for bargraph
*/
#define MIN_TEMP -10
/*!
@defined MAX_TEMP
@abstract Maximum temperature range for bargraph
*/
#define MAX_TEMP 50
extern unsigned int __bss_end;
extern unsigned int __heap_start;
extern void *__brkval;
// Initialise LCD module
// -----------------------------------------------------------------------------
#ifdef _LCD_I2C_
LiquidCrystal_I2C lcd(0x38);
#endif
#ifdef _LCD_4BIT_
LiquidCrystal lcd(12, 11, 5, 4, 3, 2, BACKLIGHT_PIN, POSITIVE);
const int CONTRAST_PIN = 9;
const int CONTRAST = 65;
#endif
#ifdef _LCD_SR_
LiquidCrystal_SR lcd(3,2,TWO_WIRE);
// | |
// | \-- Clock Pin
// \---- Data/Enable Pin
#endif
#ifdef _LCD_SR3W_
LiquidCrystal_SR3W lcd(3, 2, 4);
// | |
// | \-- Clock Pin
// \---- Data/Enable Pin
#endif
// LCD reference variable
LCD *myLCD = &lcd;
// Temperature filter variable
static double tempFilter;
/*!
@const charBitmap
@abstract Define Character bitmap for the bargraph.
@discussion Defines a character bitmap to represent a bargraph on a text
display. The bitmap goes from a blank character to full black.
*/
const uint8_t charBitmap[][8] = {
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
{ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x0 },
{ 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x0 },
{ 0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x1C, 0x0 },
{ 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x0 },
{ 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x0 },
{ 0xe, 0x11, 0x11, 0x11, 0xe, 0, 0, 0 },
{ 0x6, 0x9, 0x9, 0x6, 0x0, 0, 0, 0}
};
/*!
@function
@abstract Return available RAM memory
@discussion This routine returns the ammount of RAM memory available after
initialising the C runtime.
@param
@result Free RAM available.
*/
static int freeMemory()
{
int free_memory;
if((int)__brkval == 0)
free_memory = ((int)&free_memory) - ((int)&__bss_end);
else
free_memory = ((int)&free_memory) - ((int)__brkval);
return free_memory;
}
/*!
@function
@abstract Returns AVR328p internal temperature
@discussion Configures the ADC MUX for the temperature ADC channel and
waits for conversion and returns the value of the ADC module
@result The internal temperature reading - in degrees C
*/
static int readTemperature()
{
ADMUX = 0xC7; // activate interal temperature sensor,
// using 2.56V ref. voltage
ADCSRB |= _BV(MUX5);
ADCSRA |= _BV(ADSC); // start the conversion
while (bit_is_set(ADCSRA, ADSC)); // ADSC is cleared when the conversion
// finishes
// combine bytes & correct for temperature offset (approximate)
return ( (ADCL | (ADCH << 8)) - TEMP_CAL_OFFSET);
}
/*!
@function
@abstract Braws a bargraph onto the display representing the value passed.
@discussion Draws a bargraph on the specified row using barLength characters.
@param value[in] Value to represent in the bargraph
@param row[in] Row of the LCD where to display the bargraph. Range (0, 1)
for this display.
@param barlength[in] Length of the bar, expressed in display characters.
@param start[in] Start bar character
@param end [in] End bar character
@result None
*/
static void drawBars ( int value, uint8_t row, uint8_t barLength, char start,
char end )
{
int numBars;
// Set initial titles on the display
myLCD->setCursor (0, row);
myLCD->print (start);
// Calculate the size of the bar
value = map ( value, MIN_TEMP, MAX_TEMP, 0, ( barLength ) * CHAR_WIDTH );
numBars = value / CHAR_WIDTH;
// Limit the size of the bargraph to barLength
if ( numBars > barLength )
{
numBars = barLength;
}
myLCD->setCursor ( 1, row );
// Draw the bars
while ( numBars-- )
{
myLCD->print ( char( 5 ) );
}
// Draw the fractions
numBars = value % CHAR_WIDTH;
myLCD->print ( char(numBars) );
myLCD->setCursor (barLength + 1, row);
myLCD->print (end);
}
/*!
@function
@abstract Initialise the HW
@discussion Initialise the HW used within this application: UART, LCD & IOs
@param
@result
*/
static void initHW ( void )
{
int i;
int charBitmapSize = (sizeof(charBitmap ) / sizeof (charBitmap[0]));
Serial.begin ( 57600 );
// Hardware initialise
// ------------------------------------
//ADCSRA |= (1 << ADEN); // Initialise ADC block (no need done by env)
// Initialise LCD HW: backlight and LCD
// -------------------------------------
#ifdef _LCD_4BIT_
pinMode(CONTRAST_PIN, OUTPUT);
analogWrite (CONTRAST_PIN, CONTRAST);
#endif
#ifdef _LCD_I2C_
pinMode ( BACKLIGHT_PIN, OUTPUT );
digitalWrite (BACKLIGHT_PIN, HIGH);
#endif
pinMode ( STATUS_PIN, OUTPUT );
myLCD->begin ( 20, 2 );
// Load custom character set into CGRAM
// --------------------------------------------------------------------
for ( i = 0; i < charBitmapSize; i++ )
{
myLCD->createChar ( i, (uint8_t *)charBitmap[i] );
}
}
void setup ()
{
initHW();
Serial.println ( freeMemory () );
myLCD->clear ();
myLCD->print ( F("Free Mem: "));
myLCD->print ( freeMemory () );
delay ( 2000 );
myLCD->clear ();
myLCD->print (F("Temp:"));
myLCD->setCursor ( 8, 0 );
tempFilter = 0;
myLCD->print ( readTemperature() );
}
void loop ()
{
int temp;
static byte status = 1;
status ^= 1;
digitalWrite ( STATUS_PIN, status);
temp = readTemperature();
tempFilter = ( FILTER_ALP * temp) + (( 1.0 - FILTER_ALP ) * tempFilter);
// Display the information to the LCD
myLCD->setCursor ( 8, 0 );
myLCD->print (" ");
myLCD->setCursor ( 8, 0 );
myLCD->print ( tempFilter, 1 );
myLCD->setCursor ( 12, 0 );
myLCD->print ( "\x07" );
myLCD->print ("C");
drawBars ( tempFilter, 1, 14, '-', '+' );
delay (LOOP_DELAY);
}