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//Arduino超聲波測距程序 #include <LiquidCrystal_SoftI2C.h> #include <SoftI2CMaster.h> LiquidCrystal_SoftI2C mylcd(0x27,16,2,A5,A4); volatile int distance; float checkdistance_2_4() { digitalWrite(2, LOW); delayMicroseconds(2); digitalWrite(2, HIGH); delayMicroseconds(10); digitalWrite(2, LOW); float distance = pulseIn(4, HIGH) / 58.00; delay(10); return distance; } void setup(){ distance = 0; pinMode(2, OUTPUT); pinMode(4, INPUT); mylcd.init(); mylcd.backlight(); } void loop(){ distance = checkdistance_2_4(); mylcd.clear(); mylcd.setCursor(0, 0); mylcd.print("distance"); mylcd.setCursor(0, 1); mylcd.print(String(String(distance, DEC)) + String("cm")); delay(200); }
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