Ciao a tutti,
mi sono arrivati finalmente i max7219 che avevo ordinato e mi sono subito messo all'opera per comandare 3 display a 7 segmenti.
ho effettuato i collegamenti come indicato in questi due schiemi
il risultato? si accendono tutti i segmenti ma quando vado a comandarli con la libreria, non succede nulla.
/**************************************************************************//**
* \brief MAX7219 library for Arduino - Demo program
* \author Copyright (C) 2011 Julien Le Sech - www.idreammicro.com
* \version 1.0
* \date 20110801
*
* This file is part of the MAX7219 library for Arduino.
*
* 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 3 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 program. If not, see http://www.gnu.org/licenses/
******************************************************************************/
/**************************************************************************//**
* \file MAX7219.pde
******************************************************************************/
/******************************************************************************
* Header file inclusions.
******************************************************************************/
#include <WProgram.h>
#include <SPI.h>
#include <MAX7219.h>
/******************************************************************************
* Private variable declaration.
******************************************************************************/
static MAX7219 max7219(10);
/******************************************************************************
* Public function definitions.
******************************************************************************/
/**************************************************************************//**
* \fn void setup()
******************************************************************************/
void setup()
{
// Initiliaze MAX7219.
max7219.initialize();
// Set scan limit.
max7219.setScanLimit(MAX7219::ScanLimit_Digit0To7);
// Set decode mode.
max7219.setDecodeMode(MAX7219::DecodeMode_AllDigits);
// Set intensity.
max7219.setIntensity(MAX7219::Intensity_Level15);
// Set shutdown mode.
max7219.setShutdownMode(MAX7219::ShutdownMode_NormalOperation);
}
/**************************************************************************//**
* \fn void loop()
******************************************************************************/
void loop()
{
// To write digit values, a loop may be more elegant but a bit more
// complicated for this example.
// Write digit 0 value.
max7219.writeDigit(MAX7219::Digit_0, MAX7219::Character_Zero);
// Write digit 1 value.
max7219.writeDigit(MAX7219::Digit_1, MAX7219::Character_One);
// Write digit 2 value.
max7219.writeDigit(MAX7219::Digit_2, MAX7219::Character_Two);
// Write digit 3 value.
max7219.writeDigit(MAX7219::Digit_3, MAX7219::Character_Three);
// Write digit 4 value.
max7219.writeDigit(MAX7219::Digit_4, MAX7219::Character_Four);
// Write digit 5 value.
max7219.writeDigit(MAX7219::Digit_5, MAX7219::Character_Five);
// Write digit 6 value.
max7219.writeDigit(MAX7219::Digit_6, MAX7219::Character_Six);
// Write digit 7 value.
max7219.writeDigit(MAX7219::Digit_7, MAX7219::Character_Seven);
// Wait a little before next loop.
delay(1000);
}
ho trovato questo playground sul sto di arduino Arduino Playground - MAX72XXHardware che parla di 2 condensatori e di una resistenza, secondo voi sono la causa del fatto che non mi spenge i segmenti non necessari?
grazie in anticipo
