i need to read any analog sensor like variable resistance and show it in another board on lcd
i try to control digital signal and i success in this code

Receiver
_______

Code:

int LEDredPin =12;
int LEDgreenPin = 13;
void setup() {

  Serial.begin(9600);
 pinMode(LEDredPin, OUTPUT);
 pinMode(LEDgreenPin, OUTPUT);

}

void loop() {
  if (Serial.available()) { //If there is data in the Serial Line
    int dataByte = Serial.read();


          if(dataByte == 'H'){
              digitalWrite(LEDredPin, HIGH);
              digitalWrite(LEDgreenPin, LOW); 

            }

          if(dataByte == 'L') {
           
            digitalWrite(LEDgreenPin, HIGH);
            digitalWrite(LEDredPin, LOW);
                          }
                  }
            }

 

Transmitter
___________

Code:

const int sw1=2;
const int sw2=3;
void setup()
{
  pinMode(2,INPUT);
  pinMode(3,INPUT);
  Serial.begin(9600);
}

void loop()
{
  if(digitalRead(sw1)==1)
{
  Serial.print('H');
}
  if(digitalRead(sw2)==1)
{
Serial.print('L');
}
}

but when i try to make analog signal i failed like this code

transmitter
__________

Code:

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println(analogRead(A0));
}

Receiver
________

Code:

#include <LiquidCrystal.h>
LiquidCrystal lcd(7,8,9,10,11,12);
void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2);
}

void loop() {
  if (Serial.available()) { //If there is data in the Serial Line
   int dataByte = Serial.read();
       lcd.setCursor(0, 1);
       lcd.print(dataByte);


         
            }
}

i need to read any analog sensor like variable resistance and show it in another board on lcd
i try to control digital signal and i success in this code

Receiver
_______

Code:

int LEDredPin =12;
int LEDgreenPin = 13;
void setup() {

  Serial.begin(9600);
 pinMode(LEDredPin, OUTPUT);
 pinMode(LEDgreenPin, OUTPUT);

}

void loop() {
  if (Serial.available()) { //If there is data in the Serial Line
    int dataByte = Serial.read();


          if(dataByte == 'H'){
              digitalWrite(LEDredPin, HIGH);
              digitalWrite(LEDgreenPin, LOW); 

            }

          if(dataByte == 'L') {
           
            digitalWrite(LEDgreenPin, HIGH);
            digitalWrite(LEDredPin, LOW);
                          }
                  }
            }

 

Transmitter
___________

Code:

const int sw1=2;
const int sw2=3;
void setup()
{
  pinMode(2,INPUT);
  pinMode(3,INPUT);
  Serial.begin(9600);
}

void loop()
{
  if(digitalRead(sw1)==1)
{
  Serial.print('H');
}
  if(digitalRead(sw2)==1)
{
Serial.print('L');
}
}

but when i try to make analog signal i failed like this code

transmitter
__________

Code:

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println(analogRead(A0));
}

Receiver
________

Code:

#include <LiquidCrystal.h>
LiquidCrystal lcd(7,8,9,10,11,12);
void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2);
}

void loop() {
  if (Serial.available()) { //If there is data in the Serial Line
   int dataByte = Serial.read();
       lcd.setCursor(0, 1);
       lcd.print(dataByte);


         
            }
}

It looks as if the data is stored in TXBuf.

It also looks as if it's doing serial output within an interrupt service routine, which is not generally regarded as a smart thing to do, but if it's not causing a problem then I suppose you could ignore that.

i try to read data from TXBuf but i failed can you tell me how can i read it ? thanks     

i need to know where the data of sensor saved because  i need signal from sensor andmove servo motors
i use this sheild
http://store.fut-electronics.com/111MED0002.html
http://store.fut-electronics.com/111MED0003.html

Code:

/**********************************************************/
/* Demo program for:                                      */
/*    Board: SHIELD-EKG/EMG + Olimexino328                */
/*  Manufacture: OLIMEX                                   */
/*  COPYRIGHT (C) 2012                                    */
/*  Designed by:  Penko Todorov Bozhkov                   */
/*   Module Name:   Sketch                                */
/*   File   Name:   ShieldEkgEmgDemo.ino                  */
/*   Revision:  Rev.A                                     */
/*    -> Added is suppport for all Arduino boards.        */
/*       This code could be recompiled for all of them!   */
/*   Date: 19.12.2012                                     */
/*   Built with Arduino C/C++ Compiler, version: 1.0.3    */
/**********************************************************/
/**********************************************************
Purpose of this programme is to give you an easy way to
connect Olimexino328 to ElectricGuru(TM), see:
https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/resources/ElecGuru40.zip
where you'll be able to observe yours own EKG or EMG signal.
It is based on:
***********************************************************
* ModularEEG firmware for one-way transmission, v0.5.4-p2
* Copyright (c) 2002-2003, Joerg Hansmann, Jim Peters, Andreas Robinson
* License: GNU General Public License (GPL) v2
***********************************************************
For proper communication packet format given below have to be supported:
///////////////////////////////////////////////
////////// Packet Format Version 2 ////////////
///////////////////////////////////////////////
// 17-byte packets are transmitted from Olimexino328 at 256Hz,
// using 1 start bit, 8 data bits, 1 stop bit, no parity, 57600 bits per second.

// Minimial transmission speed is 256Hz * sizeof(Olimexino328_packet) * 10 = 43520 bps.

struct Olimexino328_packet
{
  uint8_t sync0; // = 0xa5
  uint8_t sync1; // = 0x5a
  uint8_t version; // = 2 (packet version)
  uint8_t count; // packet counter. Increases by 1 each packet.
  uint16_t data[6]; // 10-bit sample (= 0 - 1023) in big endian (Motorola) format.
  uint8_t switches; // State of PD5 to PD2, in bits 3 to 0.
};
*/
/**********************************************************/
#include <compat/deprecated.h>
#include <FlexiTimer2.h>
//http://www.arduino.cc/playground/Main/FlexiTimer2

// All definitions
#define NUMCHANNELS 6
#define HEADERLEN 4
#define PACKETLEN (NUMCHANNELS * 2 + HEADERLEN + 1)
#define SAMPFREQ 256                      // ADC sampling rate 256
#define TIMER2VAL (1024/(SAMPFREQ))       // Set 256Hz sampling frequency                   
#define LED1  13
#define CAL_SIG 9

// Global constants and variables
volatile unsigned char TXBuf[PACKETLEN];  //The transmission packet
volatile unsigned char TXIndex;           //Next byte to write in the transmission packet.
volatile unsigned char CurrentCh;         //Current channel being sampled.
volatile unsigned char counter = 0;   //Additional divider used to generate CAL_SIG
volatile unsigned int ADC_Value = 0;   //ADC current value

//~~~~~~~~~~
// Functions
//~~~~~~~~~~

/****************************************************/
/*  Function name: Toggle_LED1                      */
/*  Parameters                                      */
/*    Input   :  No                             */
/*    Output  :  No                                 */
/*    Action: Switches-over LED1.                   */
/****************************************************/
void Toggle_LED1(void){

 if((digitalRead(LED1))==HIGH){ digitalWrite(LED1,LOW); }
 else{ digitalWrite(LED1,HIGH); }
 
}


/****************************************************/
/*  Function name: toggle_GAL_SIG                   */
/*  Parameters                                      */
/*    Input   :  No                             */
/*    Output  :  No                                 */
/*    Action: Switches-over GAL_SIG.                */
/****************************************************/
void toggle_GAL_SIG(void){
 
 if(digitalRead(CAL_SIG) == HIGH){ digitalWrite(CAL_SIG, LOW); }
 else{ digitalWrite(CAL_SIG, HIGH); }
 
}


/****************************************************/
/*  Function name: setup                            */
/*  Parameters                                      */
/*    Input   :  No                             */
/*    Output  :  No                                 */
/*    Action: Initializes all peripherals           */
/****************************************************/
void setup() {

 noInterrupts();  // Disable all interrupts before initialization
 
 // LED1
 pinMode(LED1, OUTPUT);  //Setup LED1 direction
 digitalWrite(LED1,LOW); //Setup LED1 state
 pinMode(CAL_SIG, OUTPUT);
 
 //Write packet header and footer
 TXBuf[0] = 0xa5;    //Sync 0
 TXBuf[1] = 0x5a;    //Sync 1
 TXBuf[2] = 2;       //Protocol version
 TXBuf[3] = 0;       //Packet counter
 TXBuf[4] = 0x02;    //CH1 High Byte
 TXBuf[5] = 0x00;    //CH1 Low Byte
 TXBuf[6] = 0x02;    //CH2 High Byte
 TXBuf[7] = 0x00;    //CH2 Low Byte
 TXBuf[8] = 0x02;    //CH3 High Byte
 TXBuf[9] = 0x00;    //CH3 Low Byte
 TXBuf[10] = 0x02;   //CH4 High Byte
 TXBuf[11] = 0x00;   //CH4 Low Byte
 TXBuf[12] = 0x02;   //CH5 High Byte
 TXBuf[13] = 0x00;   //CH5 Low Byte
 TXBuf[14] = 0x02;   //CH6 High Byte
 TXBuf[15] = 0x00;   //CH6 Low Byte
 TXBuf[2 * NUMCHANNELS + HEADERLEN] =  0x01; // Switches state

 // Timer2
 // Timer2 is used to setup the analag channels sampling frequency and packet update.
 // Whenever interrupt occures, the current read packet is sent to the PC
 // In addition the CAL_SIG is generated as well, so Timer1 is not required in this case!
 FlexiTimer2::set(TIMER2VAL, Timer2_Overflow_ISR);
 FlexiTimer2::start();
 
 // Serial Port
 Serial.begin(57600);
 //Set speed to 57600 bps
 
 // MCU sleep mode = idle.
 //outb(MCUCR,(inp(MCUCR) | (1<<SE)) & (~(1<<SM0) | ~(1<<SM1) | ~(1<<SM2)));
 
 interrupts();  // Enable all interrupts after initialization has been completed
}

/****************************************************/
/*  Function name: Timer2_Overflow_ISR              */
/*  Parameters                                      */
/*    Input   :  No                             */
/*    Output  :  No                                 */
/*    Action: Determines ADC sampling frequency.    */
/****************************************************/
void Timer2_Overflow_ISR()
{
  // Toggle LED1 with ADC sampling frequency /2
  Toggle_LED1();
 
  //Read the 6 ADC inputs and store current values in Packet
  for(CurrentCh=0;CurrentCh<6;CurrentCh++){
    ADC_Value = analogRead(CurrentCh);
    TXBuf[((2*CurrentCh) + HEADERLEN)] = ((unsigned char)((ADC_Value & 0xFF00) >> 8)); // Write High Byte
    TXBuf[((2*CurrentCh) + HEADERLEN + 1)] = ((unsigned char)(ADC_Value & 0x00FF)); // Write Low Byte
  }

  // Send Packet
  for(TXIndex=0;TXIndex<17;TXIndex++){
    Serial.write(TXBuf[TXIndex]);
  }
 
  // Increment the packet counter
  TXBuf[3]++;
 
  // Generate the CAL_SIGnal
  counter++; // increment the devider counter
  if(counter == 12){ // 250/12/2 = 10.4Hz ->Toggle frequency
    counter = 0;
    toggle_GAL_SIG(); // Generate CAL signal with frequ ~10Hz
  }
}


/****************************************************/
/*  Function name: loop                             */
/*  Parameters                                      */
/*    Input   :  No                             */
/*    Output  :  No                                 */
/*    Action: Puts MCU into sleep mode.             */
/****************************************************/
void loop() {
 
 __asm__ __volatile__ ("sleep");
 
}

hi , i have the same shield and have EMG sensor
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/
https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/
but i can't get signal to move servo motors any one have code or any way to get analog signal from this shield i try to make code but i failed
is this shield used only to make heart rate analysis in elecguru program ?     

Hi:

You are receiving ascii characters. So, if you are sending a SMS with the text:
1

or with the text

0

you have to compare it like this:
if(c== '1')
      {digitalWrite(led,HIGH);
      }
      if(c== '0')
      {digitalWrite(led,LOW);
      }

Good luck, and please tell us how are you doing.

this code is work good but i need to send  'on'  or 'off'  to make action 

thanks for your help

Read it one character at a time, or check readBytes in the Serial reference.

please can you post any code to help me because i try to understand readbytes but i can't
thanks alot

i don't know how i take value from serial and put it in array can you adjustment my code and post it  thanks

Don't write to the fourth element of a three element array

sorry i can't understand you 

i try to make led high when enter 'on' in serial monitor and low when write 'off' i need to know why this code not operate

Code:

int ledPin=13;
  char a[2] = {'o', 'n'};
  char b[3] = {'o', 'f', 'f'};
  char c[3] ;


void setup ()
{
  Serial.begin(9600);
  pinMode(ledPin,OUTPUT);

}
void loop ()
{
c[3] = Serial.read();
{
if ((a[0]==c[0])&&(a[1]==c[1]))
{digitalWrite(ledPin,HIGH);
}
if (b[0] == c[0]&&b[1] == c[1]&&b[2] == c[2])
{digitalWrite(ledPin,LOW);
}
}
}

please i need when sent message like on make led HIGH and when sent low make led LOW

Code:

#include <GSM.h>

// PIN Number for the SIM
#define PINNUMBER ""

// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;

// Array to hold the number a SMS is retreived from
char senderNumber[20]; 
const int led =  13;
void setup()
{
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("SMS Messages Receiver");
   
  // connection state
  boolean notConnected = true;
 
  // Start GSM connection
  while(notConnected)
  {
    if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
 
  Serial.println("GSM initialized");
  Serial.println("Waiting for messages");
pinMode(led,OUTPUT);
digitalWrite(led,LOW);
}

void loop()
{
  char c;
 
  // If there are any SMSs available() 
  if (sms.available())
  {
    Serial.println("Message received from:");
   
    // Get remote number
    sms.remoteNumber(senderNumber, 20);
    Serial.println(senderNumber);

    // An example of message disposal   
    // Any messages starting with # should be discarded
    if(sms.peek()=='#')
    {
      Serial.println("Discarded SMS");
      sms.flush();
    }
   
    // Read message bytes and print them
    while(c=sms.read())
      Serial.print(c);
      if(c== 1)
      {digitalWrite(led,HIGH);
      }
      if(c== 0)
      {digitalWrite(led,LOW);
      }
    Serial.println("\nEND OF MESSAGE");
   
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

  delay(1000);

}

i receive message without make action for led ineed to know how check condition when receive message

Code:

// Read message bytes and print them
    while(c=sms.read())
      Serial.print(c);
      if(c== 1)
      {digitalWrite(led,HIGH);
      }
      if(c== 0)
      {digitalWrite(led,LOW);
      }
    Serial.println("\nEND OF MESSAGE");
   
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

how check c  if message sent 1 for HIGH and 0 for LOW

i use this shield
http://arduino.cc/en/Main/ArduinoGSMShield


thanks

i use this shield
http://arduino.cc/en/Main/ArduinoGSMShield
 

please i need when sent message like on make led HIGH and when sent low make led LOW

Code:

/*
 SMS receiver
 
 This sketch, for the Arduino GSM shield, waits for a SMS message
 and displays it through the Serial port.
 
 Circuit:
 * GSM shield attached to and Arduino
 * SIM card that can receive SMS messages
 
 created 25 Feb 2012
 by Javier Zorzano / TD
 
 This example is in the public domain.
 
 http://arduino.cc/en/Tutorial/GSMExamplesReceiveSMS
 
*/

// include the GSM library
#include <GSM.h>

// PIN Number for the SIM
#define PINNUMBER ""

// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;

// Array to hold the number a SMS is retreived from
char senderNumber[20]; 
const int led =  13;
void setup()
{
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("SMS Messages Receiver");
   
  // connection state
  boolean notConnected = true;
 
  // Start GSM connection
  while(notConnected)
  {
    if(gsmAccess.begin(PINNUMBER)==GSM_READY)
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
 
  Serial.println("GSM initialized");
  Serial.println("Waiting for messages");
pinMode(led,OUTPUT);
digitalWrite(led,LOW);
}

void loop()
{
  char c;
 
  // If there are any SMSs available() 
  if (sms.available())
  {
    Serial.println("Message received from:");
   
    // Get remote number
    sms.remoteNumber(senderNumber, 20);
    Serial.println(senderNumber);

    // An example of message disposal   
    // Any messages starting with # should be discarded
    if(sms.peek()=='#')
    {
      Serial.println("Discarded SMS");
      sms.flush();
    }
   
    // Read message bytes and print them
    while(c=sms.read())
      Serial.print(c);
      if(c== 1)
      {digitalWrite(led,HIGH);
      }
      if(c== 0)
      {digitalWrite(led,LOW);
      }
    Serial.println("\nEND OF MESSAGE");
   
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

  delay(1000);

}

i receive message without make action for led ineed to know how check condition when receive message

Code:

// Read message bytes and print them
    while(c=sms.read())
      Serial.print(c);
      if(c== 1)
      {digitalWrite(led,HIGH);
      }
      if(c== 0)
      {digitalWrite(led,LOW);
      }
    Serial.println("\nEND OF MESSAGE");
   
    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }

how check c  if message sent 1 for HIGH and 0 for LOW

please i need to download library & tutorial because i have it but i can't use it