Problem coding L2n8 with Arduino mega

Projects General Guidance
1

hi there...!
i m trying to interface four dc motors with Aurdino Mega2560 using L298 motor driver and two dht11 sensors for bidirectional movements. i just need to know how to interface two L298 drivers with Ardiuno mega2560.

Here is my code for two motors with a single Dht11 and a single L298 driver Interfaced with Arduino Mega 2560.

const int hot = 25; //set hot parameter
const int cold = 26; //set cold parameter
#include <DHT.h> // including the library
#define DHTPIN 11 
#define DHTTYPE DHT11// defining the dht pin
  
// defining enable and input pins of L298 driver
#define enA 5
#define enB 6
#define in1 7
#define in2 8
#define in3 9
#define in4 10

DHT dht (DHTPIN, DHTTYPE);

 void setup ( ) {

  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);
                                     
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);
  
   Serial.begin ( 9600 ) ;
   
   dht.begin (  ) ;
 }
 void loop ( ) { 

  float temp = dht.readTemperature ( ) ; 
  
     Serial.print ( " Temp is " ) ;  
     Serial.print ( temp ) ;         
     Serial.println ( " *C " ) ;
            
     if (temp < cold) {
                                      //i want to run both moters attached to a driver run in the same direction
    digitalWrite(enA,HIGH);
    digitalWrite(enB,HIGH);
    digitalWrite(in1, HIGH);
    digitalWrite(in2, LOW);
    digitalWrite(in3, HIGH);
    digitalWrite(in4, LOW);
    
    Serial.println(" It's Cold."); 
}
     else if (temp > hot) { //hot
      
    digitalWrite(enA,HIGH);
    digitalWrite(enB,HIGH);
    digitalWrite(in1, LOW);
    digitalWrite(in2, HIGH);
    digitalWrite(in3, LOW);
    digitalWrite(in4, HIGH);
    
    
    Serial.println(" It's Hot.");  
}

else { //fine

Serial.println(" It's Fine."); 
                                                           
 }
     Serial.print ( " Temp is " ) ;  
     Serial.print ( temp ) ;         
     Serial.println ( " *C " ) ;
            
 }

can any one please help me with coding two drivers in a same code of arduino?

2 
DHT dht (DHTPIN, DHTTYPE);

Creates an instance of the DHT object named dht

DHT dht1 (DHTPIN1, DHTTYPE);
DHT dht2 (DHTPIN2, DHTTYPE);

would create 2 instances of the DHT object named dht1 and dht2. Note that you will need to #define both of the pin numbers before you can do this.

Later in the code use each of the two objects as you would use a single one. You could also create a two element array of DHT objects but I suggest that you do not do this initially

As to the motor drivers, simply add more #defines for the pin numbers and use them but please give them sensible names that indicate which motor driver they relate to.

3

Can you plz explain code for two l298 drivers with same arduino.

4

Mazhar535:
Can you plz explain code for two l298 drivers with same arduino.

See reply #1

add more #defines for the pin numbers and use them but please give them sensible names that indicate which motor driver they relate to.

Something like

// defining enable and input pins of L298 driver
#define rightMotorenA 5
#define rightMotorenB 6
#define rightMotorin1 7
#define rightMotorin2 8
#define rightMotorin3 9
#define rightMotorin4 10

#define leftMotorenA 11
#define leftMotorrenB 12
#define leftMotorin1 13
#define leftMotorin2 A0
#define leftMotorin3 A1
#define leftMotorin4 A2

Make sure to choose pin numbers that are not used elsewhere in your program.

5

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html

Can you tell us or post a picture of your motor driver please?

Can you please post a copy of your circuit as it is with one DHT and one motor driver, in CAD or a picture of a hand drawn circuit in jpg, png?

How are you powering your project?

What motors are you using?

Thanks.. Tom.. :slight_smile: