Flex Sensor Controlled Rc Car Using Arduino Uno

Using two Gearmotors illustrating two wheels of a car and a flex sensor. Control its direction using the flex value output by the flex sensor. The gearmotors run in the forward direction for the higher range of flex values. It functions in the opposite direction in the lower range. reference breakthrough value considered is 85.

1. Arduino uno -1
2. Gearmotors - 2
3. Servo motor - L293D- 1
4. Resister -163 ohm - 1
5. Flex sensor - 1
6. Jumper wires

TinkerCAD diagram

Starting from top left :

1. Power 1
2. Input 4
3. Output 4
4. Ground
5. Ground
6. Output 3
7. Input 3
8. Enable 3&4
9. Enable 1&2
10. Input 1
11. Output 1
12. Ground
13. Ground
14. Output 2
15. Input 2
16. Power 2

#define IN1 12

#define IN2 11

#define IN3 10 

#define IN4 9

#define ena 5

#define enb 6

const int flexPin=A0;

void setup()

{

 pinMode(IN1,OUTPUT);

 pinMode(IN2,OUTPUT);

 pinMode(IN3,OUTPUT);

 pinMode(IN4,OUTPUT);

 digitalWrite(IN1,LOW);

 digitalWrite(IN2,LOW);

 digitalWrite(IN3,LOW);

 digitalWrite(IN4,LOW);

 analogWrite(ena,0);

 analogWrite(enb,0);

 delay(1000);

 Serial.begin(9600);

}

void loop()

{

int flexValue;

int a;

flexValue=analogRead(flexPin);

a=map(flexValue,159,511,0,255);

Serial.print("sensor : ");

Serial.println(a);

if (a>=85)

{

analogWrite(ena,flexValue);

analogWrite(enb,flexValue);

digitalWrite(IN1,HIGH);

digitalWrite(IN2,LOW);

digitalWrite(IN3,HIGH);

digitalWrite(IN4,LOW);

}else

if (a<85)

{

 analogWrite(ena,flexValue);

 analogWrite(enb,flexValue);

 digitalWrite(IN1,LOW);

 digitalWrite(IN2,HIGH);

 digitalWrite(IN3,LOW);

 digitalWrite(IN4,HIGH);

}

}