无法获取Serial.print工作

Question

我有一个简单的程序：

void setup() { 
    Serial.begin(9600); 
} 

void loop() { 
    int x = 0; 
    Serial.print(x++); 
} 

每当我试图寻找和查看序列日志不显示任何东西，我在做什么错。我正在使用Arduino Leonardo，草图编译和上传。

-----------------更新1 ---------------

我真的想要得到控制台打印出下面的代码。然而，因为它失败了，我做了一个简短而简单的程序：

// SparkFun Soil Moisture Sensor and Serial LCD example 1 
// By Sarah Al-Mutlaq 2015 
// Sketch reads sensor and desplays level and whether soil is wet or dry 

// Use the softwareserial library to create a new "soft" serial port 
// for the display. This prevents display corruption when uploading code. 
#include <SoftwareSerial.h> 

// Attach the serial display's RX line to digital pin 2 
SoftwareSerial mySerial(3,2); // pin 2 = TX, pin 3 = RX (unused) 


// Here we are setting up some water thersholds that we will 
// use later. Note that you will need to change these to match 
// your soil type and environment. 

int thresholdUp = 400; 
int thresholdDown = 250; 

// We are setting up the pin A0 on the redboard to be our sensor 
// pin input: 

int sensorPin = A0; 


void setup(){ 
    mySerial.begin(9600); // set up serial port for 9600 baud (speed) 
    delay(500); // wait for display to boot up 
} 

void loop(){ 
    // Here we are declaring a string, which are lines of words, 
    // and we want DisplayWords to be the words displayed on 
    // the LCD screen, which will change based on whether the soil 
    // wet or dry based on our threshold values above. 
    String DisplayWords; 

    // We need to set up a pin to get the value that the soil 
    // moisture sensor is outputting, so sensorValue will get the 
    // analog value from the sensor pin A0 on the redboard that we 
    // set up earlier. 

    int sensorValue; 
    sensorValue = analogRead(sensorPin); 

    // move cursor to beginning of first line on LCD: 
    mySerial.write(254); 
    mySerial.write(128); 

    // clear display: 
    mySerial.write("    "); 
    mySerial.write("    "); 

    // move cursor to beginning of first line of the LCD screen: 
    mySerial.write(254); 
    mySerial.write(128); 

    //Write what we want to desplay on the screen: 
    mySerial.write("Water Level: "); 
    mySerial.print(sensorValue); //Using .print instead of .write for values 

    // Now we are going to check if the water level is below a 
    // out thresholdDown value we set earlier, and if it is have 
    // words "Dry, Water it!" display one column over on the first 
    // row: 

    if (sensorValue <= thresholdDown){ 
    // move cursor to beginning of second line on LCD: 
    mySerial.write(254); 
    mySerial.write(192); 

    DisplayWords = "Dry, Water it!"; 
    mySerial.print(DisplayWords); 

    // If the value is not below our thresholdDown value we want to 
    // check if it is above our thresholdUp value, and if it is 
    // change the display words to "Wet, Leave it!": 



    } else if (sensorValue >= thresholdUp){ 
    // move cursor to beginning of second line on LCD: 
    mySerial.write(254); 
    mySerial.write(192); 

    DisplayWords = "Wet, Leave it!"; 
    mySerial.print(DisplayWords); 

    // Otherwise if it is inbetween the two values we want it to 
    // the display it had, so if our soil was really wet and drying 
    // the words would only change to "Dry, Water it!" when it got to the lower threshold 
    // (thresholdDown), but if it was dry and getting wetter the words 
    // would only change to "Wet, Leave it!" when it got to the upper 
    // threshold (thresholdUp_): 

    } else { 
    // move cursor to beginning of second line on LCD: 
    mySerial.write(254); 
    mySerial.write(192); 

    mySerial.print(DisplayWords); 
    } 

    delay(500); //wait for half a second, so it is easier to read 
} 

Answer 1

我现在看到你正在控制显示器。使用这些不像发送字节到终端模拟器。他们必须受到控制。控制这些串行显示通常包括发送一些初始化命令，如果它们具有相同的显示控制器，则这些初始化命令对于不同的显示器通常（但不总是）相似。

我不知道你正在使用什么显示部分，但我想冒险一些初始化命令丢失。 500ms延迟通常是其中的一部分，但在发送光标定位命令之前，请检查您的文档是否需要发送任何其他init命令。

通常情况下，您必须发送一个初始字节命令，将显示器置于命令模式，发送一些配置命令，然后退出命令模式以实际使用显示器。如果是基于Hitachi 44780的显示器，则可以在44780 datasheet上查看数据表。