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Object following robot stuck in while loop

Pixy Hardware
#1

Hi here is my code i am making a object following robot using pixy 2,arduino,l298n code is almost complete i just need help as my width is not updating in operate loop please help
#include <Pixy2.h>

Pixy2 pixy;
int mL= 4;
int mR = 2;
int eL = 5;
int eR = 3;

void setup() {
Serial.begin(115200);
pixy.init();
Serial.println(“Initialising Pixy Camera …”);

for(int i=10;i<13;i++)
pinMode(i, OUTPUT);
pinMode(mL,OUTPUT);
pinMode(mR,OUTPUT);
pinMode(eL,OUTPUT);
pinMode(eR,OUTPUT);
digitalWrite(mL,LOW);
digitalWrite(mR,LOW);

}

void loop() {

int sig,index;
pixy.ccc.getBlocks(); // grabbing blocks

if (pixy.ccc.numBlocks)
{
Serial.print("Detected ");
Serial.println(pixy.ccc.numBlocks);

for(int j=10;j<13;j++)
  digitalWrite(j, LOW);
  
for (int i=0; i<pixy.ccc.numBlocks; i++)
{
  Serial.print("  Block Signature ");
  Serial.print(i);
  Serial.print(": ");
  sig = pixy.ccc.blocks.m_signature;
  index = pixy.ccc.blocks.m_index;
  Serial.println(sig);
  if((sig == 1)||(sig == 2)||(sig == 3))
  operate(i,sig,index);
  break;
}
  find_block();
  delay(10);

}
}

void operate(int i,int sig,int index)
{
int x,width;
width=pixy.ccc.blocks.m_width;

while(width<70)//this is to check width
{

if(x<34)
{slight_left();
width=pixy.ccc.blocks.m_width;}

else if(x>280)
{ slight_right();
width=pixy.ccc.blocks.m_width;}
else
{ forward();
width=pixy.ccc.blocks.m_width;}
delay(10);
Serial.println(width);
width=pixy.ccc.blocks.m_width;
}
stopp();
arm_up();
}

void find_block()
{
pixy.ccc.numBlocks=0;
while(pixy.ccc.numBlocks == 0)
{
rotate();
pixy.ccc.getBlocks();
}
}
void slight_left()
{
digitalWrite(mL,HIGH);
analogWrite(eL,220);
digitalWrite(mR,LOW);
analogWrite(eR,220);
Serial.println(“left”);

delay(100);

}

void slight_right()
{
digitalWrite(mL,LOW);
analogWrite(eL,220);
digitalWrite(mR,HIGH);
analogWrite(eR,220);
Serial.println(“right”);

delay(100);

}

void rotate()
{
digitalWrite(mL,HIGH);
analogWrite(eL,220);
digitalWrite(mR,LOW);
analogWrite(eR,220);

 Serial.println("rotate");
 delay(10);

}
void forward()
{
digitalWrite(mL,HIGH);
analogWrite(eL,220);
digitalWrite(mR,HIGH);
analogWrite(eR,220);
Serial.println(“fwd”);
delay(100);

}
void stopp()
{
digitalWrite(mL,LOW);
analogWrite(eL,0);
digitalWrite(mR,LOW);
analogWrite(eR,0);
Serial.println(“stop”);
delay(100);
}

void arm_up()
{
Serial.println(“pickup”);
}

#2

Hi,

pixy.ccc.blocks is an array. You need to reference an array member in order to get usable data. Like this:

pixy.ccc.blocks[i].m_width
where “i” is an integer.

You might also check your code on lines 43 and 44, since it looks like you’re making the same error there.

#3

can you please tell me where i am wrong

#4

Yes. All of the lines where you define “width”, and these lines:

sig = pixy.ccc.blocks.m_signature;
index = pixy.ccc.blocks.m_index;

The correct code would look like this:

sig = pixy.ccc.blocks[i].m_signature;
index = pixy.ccc.blocks[i].m_index;

And these lines need to be inside of a for loop where the value of “i” is incremented.

Cheers,
Jesse

#5

here i have done the same but the thing is width is not updating rest everything is updating` for (int i=0; i<pixy.ccc.numBlocks; i++)
{
Serial.print(" Block Signature “);
Serial.print(i);
Serial.print(”: ");
sig = pixy.ccc.blocks[i].m_signature;
index = pixy.ccc.blocks[i].m_index;
Serial.println(sig);
if((sig == 1)||(sig == 2)||(sig == 3))
operate(i,sig,index);
break;
}
find_block();
delay(10);
}
}

void operate(int i,int sig,int index)
{
int x,width;
width=pixy.ccc.blocks[i].m_width;
while(width<84)
{
x = pixy.ccc.blocks[i].m_x;
if(x<30)
slight_left();
if(x>285)
slight_right();
else
forward();
delay(10);
}
stopp();
arm_pickup();
}

void find_block()
{
pixy.ccc.numBlocks=0;
while(pixy.ccc.numBlocks == 0)
{
rotate();
pixy.ccc.getBlocks();
}
}`

#6

Hi Munish,

the first part of your code looks good, but everything inside of void operate isn’t updating because again, the value of i is not being updated. You need to wrap that code, too, inside of a for loop to change the value of i.

Hope this helps,
Jesse

#7

Hey Munish,

dit you ever get it to work?

If so, are you willing to share your code with me?