friends ,me and my team is working on a gsm based wireless display as a part of our project.we are using arduino UNO as the microcontroller which is interfaced with a sim900 module ,upon arrival of anew sms in the gsm module its content will be passed on to the dot matrix led display through software serial .we almost got the code working but the problem we now encounter is the reception of new sms,the code works fine for the first sms but to display the next new sms we had to manually reset the arduino every time.this is the code
#include <SoftwareSerial.h>
#include <SPI.h>
#include <DMD.h>
#include <TimerOne.h>
#include "SystemFont5x7.h"
#include "Arial_black_16.h"
#define DISPLAYS_ACROSS 1
#define DISPLAYS_DOWN 1
DMD dmd(DISPLAYS_ACROSS, DISPLAYS_DOWN);
int temp=0,i=0,x=0,k=0;
char str[160],msg[160];
void ScanDMD()
{
dmd.scanDisplayBySPI();
}
SoftwareSerial SIM900(0, 1);
void setup()
{
Timer1.initialize( 5000 );
Timer1.attachInterrupt( ScanDMD );
dmd.clearScreen( true );
Serial.begin(9600);
SIM900.begin(9600);
void SIM900power();
delay(20000);
SIM900.print("AT+CMGF=1\r");
delay(100);
SIM900.print("AT+CNMI=2,2,0,0,0\r");
delay(100);
}
void SIM900power()
{
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
delay(7000);
}
void loop()
{
for(unsigned int t=0;t<60000;t++)
{
void serialEvent();
if(temp==1)
{
x=0,k=0,temp=0;
while(x<i)
{
while(str[x]=='#')
{
x++;
while(str[x]!='')
{
msg[k++]=str[x++];
}
}
x++;
}
}
}
const char dchars;
dchars=msg;
dmd.clearScreen( true );
dmd.selectFont(Arial_Black_16);
for(unsigned int i=0;i<=300;i++)
{
dmd.drawMarquee(dchars,strlen(dchars),(32*DISPLAYS_ACROSS)-1,0);
long start=millis();
long timer=start;
boolean ret=false;
while(!ret)
{
if ((timer+30) < millis())
{
ret=dmd.stepMarquee(-1,0);
timer=millis();
}
}
}
}
void serialEvent()
{
while(Serial.available())
{
char ch=(char)Serial.read();
str[i++]=ch;
if(ch == '*')
{
temp=1;
}}
}
the dmd fuction was found from the net