Keyestudio 4WD Bluetooth Multi-functional Car Manual page 115

}
}
int Ultrasonic_Ranging(unsigned char Mode)//function of ultrasonic distance detecting ，MODE=1，displaying，no displaying under other situation
{
int old_distance;
digitalWrite(outputPin, LOW);
delayMicroseconds(2);
digitalWrite(outputPin, HIGH);
delayMicroseconds(10);
digitalWrite(outputPin, LOW);
int distance = pulseIn(inputPin, HIGH); // reading the duration of high level
distance= distance/58; // Transform pulse time to distance
if(Mode==1){
lcd.setCursor(11, 1);
lcd.print("H= ");
lcd.setCursor(13, 1);
lcd.print(distance,DEC);
Serial.print("\n H = ");
Serial.print(distance,DEC);
return distance;
}
else return distance;
}
int ask_pin_L(unsigned char Mode)
{
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