Arduino code probs(again)

Community General Discussions
1

ok the motor code works fine now, but now i added, some of the 2-10cm infrared sensors ,and the code just drives forward, as if it doesnt see the infrared? any help would be appreciateted ,here is the code

int infra=3;
int value = 0 ;
int infra2=4;
int val2= 0;

void setup()
{
Serial.begin(9600);
pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
pinMode (11,OUTPUT);
pinMode (10,OUTPUT);
pinMode (3,INPUT);
pinMode (infra,INPUT);
}


NEW: the first 2 parts work the third doesnt

void loop()
{
if (digitalRead(infra)==HIGH)

{

driveforward() ;

}


else if (digitalRead(infra)==LOW)

{ stopmot ();

delay (500);

right();

delay(1000);

}

THIS doesnt work

else if (digitalRead (infra2)==LOW)

{ stopmot ();

delay (500);

left();

delay(1000);

 











void driveforward()
{
digitalWrite(13,HIGH);
digitalWrite(10,HIGH);
digitalWrite (11,LOW);
digitalWrite (12,LOW);
}

void stopmot()
{
digitalWrite(13,LOW);
digitalWrite(12,LOW);
digitalWrite(11,LOW);
digitalWrite(10,LOW);
}
void reverse()
{
digitalWrite(12,HIGH);
digitalWrite(11,HIGH);
digitalWrite (13,LOW);
digitalWrite (10,LOW);
}

void right()
{
digitalWrite (10,HIGH);
digitalWrite (13,LOW);
digitalWrite (12,LOW);
digitalWrite (11,LOW);
}

void left()
{
digitalWrite (12,HIGH);
digitalWrite (11,LOW);
digitalWrite (13,LOW);
digitalWrite (10,LOW);
}

2

not sure if its this:

void loop()
{
value = digitalRead(infra);

if (digitalRead(value, HIGH));

driveforward();

if (digitalRead(value, LOW));
stopmot();
}

dont know if it makes a diference.

 

you put

int value = 3, isnt that the 3 of the analog pins?

 

3

2-10 cm sensors? Are they
2-10 cm sensors? Are they Sharp GP2D120? If so, they are analog sensors not digital. You need to use value=analogRead(infra) and Serial.println(value, DEC) to see the values on the debug screen and decide what value makes a good threshold for your robot. Then you can make decisions based on greater or smaller values returned by the sensor.

4

Hmmm…

Ok, is it bumping into things? It won’t start detecting things till it’s within 10cm or 4 inches to the sensor. Like Ro-Bot-X said it’s analog device so you need to take an analog read on pin 3. Also comment your code, becuase you will find a lot of errors that way and it only takes a few extra minutes and the time is well worth the hours it saves on debugging.

 

Mech

5

**oh sorry **

sorry the sensor is this one , it says it is digital http://www.robotgear.com.au/Product.aspx/Details/309

thanks for ur help, i got it working, and ro-bot-x i think im going to upgrad to those sensors and love mini eric

6

But you’re reading an

But you’re reading an analogPin digitally, so when you say digitalRead(3) you’re actually reading digital pin 3, and when you say

int infra = 3; you’re saying its analog pin 3…

try connecting the sensor to DIGITAL pin 3?

7

**i have **
i have the sensor hooked up to digital pin 3

8

have you tried what the
have you tried what the first post says?

9

**oh **

yep i did try that and because its a digital sensor i can only read the value not save it to a variable

so it has to be

if (digitalRead(infra)==HIGH)

not if (digitalRead(value)

10

**yep **

that works, thanks

i can now enter my robot in the arduino challenge , thanks for all your help guys .