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A* ALGORITHM BASICS FOR PATH FINDING & HEURISTICS METHODS : ARTIFICIAL INTELLIGENCE

 A* ALGORITHM BASICS FOR PATH FINDING A* , widely used  known form of best-first search & path planning algorithm nowadays in mobile robots,games. this is the function for A*,                                     f(n) = g(n) + h(n) g ( n ) is the cost of the path from the start node to n , and h ( n ) is a heuristic function that estimates the cost of the cheapest path from n to the goal This will find cheapest f(n) value in neighbor nodes to archive goal node. check below image  A to B path finding with g(n),h(n),f(n) value In the final level check below image Now we will check the Algorithm // A* Search Algorithm 1. Initialize the open list 2. Initialize the closed list put the starting node on the open list (you can leave its f at zero) 3. while the open list is not empty a) find the node with the least f on the open list, call it "q" b) pop q off the open list c) generate q's 8 successors

Soft WDT reset Error can Fixed with single line code in Nodemcu (IOT)




when you use while loops in your codeing with delay function (in nodemcu),
you must face this error  Soft WDT reset.
lets see a example

 //////example/////////

int motor = D1;//5;     // LED pin
int encoder = A0;//4; // push button is connected
void setup() {
Serial.begin(9600);
        pinMode(motor, OUTPUT);   // declare LED as output
        pinMode(encoder, INPUT);
}

void loop() {
  
   Serial.println(analogRead(encoder));
    while(analogRead(encoder)>=400){
      digitalWrite(motor, HIGH);
      Serial.println(analogRead(encoder));
      }
      digitalWrite(motor, LOW);
}



when you run like this code you will face below prblms 


Soft WDT reset

ctx: cont 
sp: 3ffef120 end: 3ffef390 offset: 01b0

>>>stack>>>
3ffef2d0:  feefeffe feefeffe feefeffe feefeffe  
3ffef2e0:  40219851 00000004 3ffe835c 33383980  
3ffef2f0:  40219af3 00000004 3ffe835c 0000018f  
3ffef300:  3ffee338 00000004 3ffe835c 00000000  
3ffef310:  40212d38 00000000 3ffee338 40201ee1  
3ffef320:  3ffe8468 000003d7 3ffee338 40201fcb  
3ffef330:  00000000 000003d7 40203358 3ffe8360  
3ffef340:  40201126 3ffe835c 3ffee338 40201ff4  
3ffef350:  feefeffe 3ffe835c 3ffe8360 40201cb5  
3ffef360:  00000000 00000000 00000001 3ffee35c  
3ffef370:  3fffdad0 00000000 3ffee354 40202184  
3ffef380:  feefeffe feefeffe 3ffee370 40100114  
<<<stack<<<
? )� 






 if you got like this error you can easily fix it 
add  
        dealy(0); 
inside the loop .

example 

int motor = D1;//5;     // LED pin
int encoder = A0;//4; // push button is connected
void setup() {
Serial.begin(9600);
        pinMode(motor, OUTPUT);   // declare LED as output
        pinMode(encoder, INPUT);
}

void loop() {
  
   Serial.println(analogRead(encoder));
    while(analogRead(encoder)>=400){
      digitalWrite(motor, HIGH);
      Serial.println(analogRead(encoder));
      delay(0);                                               //added here
      }
      digitalWrite(motor, LOW);
   delay(2);

Thank you guys if you want to ask anything leave with a comment.
 

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A* ALGORITHM BASICS FOR PATH FINDING & HEURISTICS METHODS : ARTIFICIAL INTELLIGENCE

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