int pot2=A1; const int motor_IN1=11; // MOTOR input 1(L293) const int motor_IN2=4; // motor input 2(L293) const int motor_ENA=9; //enable pin(L293) double speed_Level; //variable of speed level int Percent; void setup() { Serial.begin(9600); pinMode(motor_IN1,OUTPUT); pinMode(motor_IN2,OUTPUT); pinMode(11,OUTPUT); TCCR2B=(TCCR2B&0xF8) | 2; } void loop() { analogWrite(motor_IN1,speed_Level); analogWrite(motor_IN2,LOW); speed_Level=analogRead(pot2); speed_Level=constrain(speed_Level,0,255); Percent =(speed_Level/255)*100; Serial.print("PWM LEVEL= "); Serial.print(speed_Level); Serial.print(" , "); Serial.print(" speed level in Percent= %"); Serial.print(Percent); Serial.print("\n"); }