Can you please guide me about analog joystick ? Is it possible to control the directions and speed of two motors just like an RC Car movements with one joystick (VRx, VRy )

Projects General Guidance
20

I'm using a two BLDC motors and running it perfectly with a joystick with Forward and Backward Commands. I want to achieve forward left, forward right, reverse left and reverse right but my results were not perfect with this.

Here below is the graph that I sketched, with the help of this graph, I wrote my code.

20210929_130031
20210929_1300311920×2560 315 KB

Joystick Graph is here, i just inverted the X-Axis as well

20211001_114330
20211001_1143301920×1440 76.7 KB 

int VRx=A0; // ANALOG READING FOR FRONT AND BACK MOVEMENT
int VRy=A1; // ANALOG READING FOR RIGHT AND LEFT MOVEMENT
int Sw=2; //
float Aval; //VALUE OF VOLTAGE AT A0 PORT
float Bval; //VALUE OF VOLTAGE AT A1 PORT
unsigned int MAXIMUM = 1023; //MAXIMUM RESOLUTION
unsigned int MID = 512;
unsigned int MAX = 1023;


void setup() {

Serial.begin(4800);
pinMode(VRx,INPUT);
pinMode(VRy,INPUT);
pinMode(Sw,INPUT);
//digitalWrite(Sw,HIGH);
}
 
void loop() {

 unsigned long tempA=0; //motor A speed
 unsigned long tempA1=0; //use for formula
 Aval=analogRead(VRx);
 tempA = Aval;
 Serial.println (tempA);

 unsigned long tempB=0; //motor B speed
 unsigned long tempB1=0; //use for formula
 Bval=analogRead(VRy);
 tempB = Bval;
 Serial.println (tempB);


//FORWARD

 if ((tempA>550) && (tempB>450 && tempB<550))
{                     
  tempA1 = (((tempA-MID)*100)/MID);
  char st[20]; // Send command to the buffer Vx as a statement for motor A
  char st1[20]; // Send command  Vy as a statement for motor B
 sprintf(st,"<A+%03lu>",tempA1);
 sprintf(st1,"<B+%03lu>",tempA1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempA);
 }
 
//BACKWARD

 if ((tempA<450) && (tempB>450 && tempB<550)){                     
  tempA1= (((MID - tempA)*100)/MID);
  char st[20];
  char st1[20];
 sprintf(st,"<A-%03lu>",tempA1);
 sprintf(st1,"<B-%03lu>",tempA1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempA);
 }

// NEUTRAL

 if ((tempA>450 && tempA<550) && (tempB>450 && tempB<550))
{  
  char st[20];
 Serial.println ("<A+000>");
 Serial.println ("<B+000>");
// Serial.println (tempA);
// Serial.println (tempB);
  }

 // FORWARD LEFT

if (tempB<450 && tempA>550)                                
{                                                           
tempA1= (((tempA - MID)*100)/MID);
tempB1 = (((MID - tempB)*100)/MID);
  char st[20];
  char st1[20];
 sprintf(st,"<A+%03lu>",tempA1);
 sprintf(st1,"<B+%03lu>",tempB1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempB);
 }


  // FORWARD RIGHT
  if (tempB>550 && tempA>550)
  {                                                           
  tempA1 = (((tempA - MID)*100)/MID);
  tempB1= 100 - (((tempB - MID)*100)/MAX);
  char st[20];
  char st1[20];
 sprintf(st,"<A+%03lu>",tempA1);
 sprintf(st1,"<B+%03lu>",tempB1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempB);
 }


//REVERSE RIGHT
 
 if (tempB>550 && tempA<450)
  {                                                            
  tempA1 = (((MID - tempA)*100)/MID);
  tempB1= (((MAX - tempB)*100)/MAX);
  char st[20];
  char st1[20];
 sprintf(st,"<A-%03lu>",tempA1);
 sprintf(st1,"<B-%03lu>",tempB1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempB);
 }


//REVERSE LEFT
 if (tempB<450 && tempA<450)
  {                                                            
  tempA1= (((MID - tempA)*100)/MID);
  tempB1= (((MID - tempB)*100)/MID);
  char st[20];
  char st1[20];
 sprintf(st,"<A-%03lu>",tempA1);
 sprintf(st1,"<B-%03lu>",tempB1);
 Serial.println (st);
 Serial.println (st1);
// Serial.println (tempB);
 }
 delay(500);
}

Thank You :slight_smile: