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wire communication between 2 arduinos

Former Member

i am having issues getting my code to display the reading from the sensors on the lcd which is located on the second arduino

this is the code that i wrote for it and any help would be great in getting it to work.

 

//reciever

#include <SPI.h>

#include <LiquidCrystal.h>

int heartratepin=A1;

int inpin=A0;

LiquidCrystal lcd(30,31,32,33,34,35);

void setup()

{

  lcd.begin(16,2);

  Serial.begin(9600);

}

void loop()

{

  if(Serial.available()==1)

  {

    int inByte=Serial.read();

    int analogValue=analogRead(inpin);

    lcd.print(analogValue);

    lcd.print(",");

   

    int newHeartReading=analogRead(heartratepin);

    lcd.print(newHeartReading);

    lcd.print(",");

   

   

 

 

  }

}

 

 

//sender

int inpin=A0;

int TEMP=0;

int heartratepin=A1;

int difference;

int newHeartReading = 0;

int lastHeartReading = 0;

int measurements[5] = {0,0,0,0,0};

int historySize = 5;

int recenttotal = 0;

int Index = 0;

boolean highChange = false;

int minimumdifference = 2;

int num[5];

int average=0;

 

 

// Heart rate timing

long lastHeartbeatTime = 0;

long debounceDelay = 150;       // the debounce time; increase if the output flickers

int currentHeartrate = 0;

int lastHeartrate = 0;

//Heart rate LED

int ledState = LOW;

long ledOnMillis = 0;

long ledOnInterval = 50;

int slope = ((newHeartReading-lastHeartReading)/(debounceDelay-lastHeartrate));

 

 

 

 

 

 

// Debugging string

String debugOutput = "";

void setup() {

   // start serial port at 9600 bps:

   Serial.begin(9600);

   // pinMode(heartratepin,INPUT);

   establishContact();

}

void establishContact() {

while (Serial.available() <= 0) {

      Serial.println("hello");   // send a starting message

      delay(300);

   }

}

void loop() {

 

   int analogValue = analogRead(inpin);

   float millivolts = (analogValue/1024.0)*5000;

   float celsius = millivolts/10-50;

   Serial.println(analogValue);

   Serial.print(celsius);

   Serial.print("c");

   Serial.print((celsius*9)/5+32);

   Serial.print("F");

   newHeartReading = analogRead(heartratepin);

    //calculation

  difference = newHeartReading - lastHeartReading;

  lastHeartReading = newHeartReading;

 

  // Find new recent total

  recenttotal = recenttotal - measurements[Index] + difference;

  // replace indexed recent value

  measurements[Index] = difference;

   //index + 1 index = (index + 1) % historySize;

    for (int i=0; i<5; i=i+1){

               num[i]=0;        

   }

    

              if (Index>=5)

              Index=0;

              //calculating the average

              average=recenttotal/5;

              Serial.println(average);

              delay(10);

  if (recenttotal >= minimumdifference)

  {

    // possible heart rate check timing

    if (millis() - lastHeartbeatTime >= debounceDelay)   // whatever the reading is at, it's been there for longer

    // than the debounce delay, so take it as the actual current state:

 

 

    {

  // Heart rate

  //digitalWrite(ledPin, HIGH);

  currentHeartrate = 60000 / (millis() - lastHeartbeatTime);

    lastHeartbeatTime = millis();

   Serial.println(newHeartReading);

      if (currentHeartrate <= 200)// && currentHeartrate > 20)

    { 

                 

                  Serial.print("Heart Rate =" + String(currentHeartrate) + "  ");

                  delay(10);

    }

            if (currentHeartrate <= 39 and currentHeartrate >= 0){

                

                  Serial.print("I Am Sick");

                }

                 delay(10);

          if (currentHeartrate<= 79 and currentHeartrate >= 70){

                

                  Serial.print("Night Mare");

                }

                delay(10);

            if (currentHeartrate <= 69 and currentHeartrate >= 40){

               

                  Serial.print("kid Is At Sleep");

          }

              delay(10);

              if (currentHeartrate <= 99 and currentHeartrate >= 80){

                 

                  Serial.print("Kid Is Resting");

             }

                delay(10);

                if (currentHeartrate <= 119 and currentHeartrate >= 100){

                

                  Serial.print("Kid Is Playing");

               }

             

                  if(currentHeartrate > 120){

                   

                    Serial.print(" The Kid Is Having ");

                 

                    Serial.print(" A Heart Attack");

                }

  

  

 

 

   // print different formats:

   Serial.write(analogValue);  // Print the raw binary value

   Serial.print('\t');             // print a tab

   Serial.write(newHeartReading);  // Print the raw binary value

  Serial.print('\t');             // print a tab

 

}

  }

}

Parents
  • 0

    In your receiver code you have the following line:

    int inByte=Serial.read();

    which is taking the input characters from the serial string. The issue is that you don't appear to be using "inByte" anywhere else in that code.

    You appear to reading and displaying analog values locally on the receiver instead.

     

    Try replacing all of the LCD print institutions with a single line:

    lcd.print(inByte);

     

     

    Your new code on the receiver should be something like:

    // Reciever
#include <SPI.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(30,31,32,33,34,35);
void setup() {
  lcd.begin(16,2);
  Serial.begin(9600);
}
void loop() {
  if(Serial.available()==1) {
    int inByte=Serial.read();
    lcd.print(inByte);
  }
}

     

    See how you get on with that.

Reply
  • 0

    In your receiver code you have the following line:

    int inByte=Serial.read();

    which is taking the input characters from the serial string. The issue is that you don't appear to be using "inByte" anywhere else in that code.

    You appear to reading and displaying analog values locally on the receiver instead.

     

    Try replacing all of the LCD print institutions with a single line:

    lcd.print(inByte);

     

     

    Your new code on the receiver should be something like:

    // Reciever
#include <SPI.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(30,31,32,33,34,35);
void setup() {
  lcd.begin(16,2);
  Serial.begin(9600);
}
void loop() {
  if(Serial.available()==1) {
    int inByte=Serial.read();
    lcd.print(inByte);
  }
}

     

    See how you get on with that.

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