c - Arduino，似乎语法不正确

Question

水温应保持在 24-27'c 之间 - 如果没有打印到 LCD 上并发出蜂鸣器声音。水位也会受到监控，并应点亮相关的 LED。

我的问题是，当从循环编译此代码时，我总是收到错误。我假设我缺少大括号或相当基本的东西，但我一生都无法弄清楚我哪里出了问题。

任何人都可以指出我正确的方向吗？ - 我承认这可能是一个简单的修复，但我看不到树木。

        void loop()
        {

            WaterTemp = (sensors.getTempCByIndex(0));

            Serial.print(F(" Requesting temperatures..."));
            sensors.requestTemperatures(); // Send the command to get temperature
            Serial.println("DONE");

            Serial.print(F("Water Temperature is: "));
            Serial.println(WaterTemp);
            lcd.setCursor(9, 0);
            lcd.print(WaterTemp, 1);
            lcd.print(F(" "));
            lcd.print((char)223);
            lcd.print(F("C"));
            delay(1000);

        }

        if (WaterTemp <24)
        {
            tone(piezoPin,600, 200);
            delay(1000);
            lcd.print("TEMP LOW");
        }
        if (WaterTemp >27)
        {
            tone(piezoPin, 400, 200);
            delay(1000);
            lcd.print("TEMP HIGH");
        }
    }

    value = analogRead(read); //Read data from analog pin and store

    if (value<=390) {
        Serial.println("Water level: 0mm -Fill FISHTANK NOW!!!");
        digitalWrite (4, HIGH);
        digitalWrite (3, LOW);
        digitalWrite (2, LOW);
        tone(piezoPin,500, 400);
        delay(1500);
    }
    else if (value>450 && value<=529) {
        Serial.println("Water level: 10mm Fill Fishtank ASAP");
        digitalWrite (4, HIGH);
        digitalWrite (3, HIGH);
        digitalWrite (2, LOW);
    }
    else if (value>540 && value<=550) {
        Serial.println("Water level: 20mm Fishtank getting low!!");
        digitalWrite (4, LOW);
        digitalWrite (3, HIGH);
        digitalWrite (2, LOW);
    }
    else if (value>560 && value<=570) {
        Serial.println("Water level:30mm  Fishtank below optimum level");
        digitalWrite (4, LOW);
        digitalWrite (3, HIGH);
        digitalWrite (2, HIGH);
    }

    else if (value>580) {
        Serial.println("Water level:40mm Fishtank FULL");
        digitalWrite (4, LOW);
        digitalWrite (3, LOW);
        digitalWrite (2, HIGH);

    }

    delay(2000); // Check for new value every 3 sec
}

Answer 1

延迟语句后面有一个不应该出现的“{”。有了它，它外面的所有代码都不会在循环函数中，这会导致编译器错误。