更改四线制触摸屏的原点

Question

我可以读取我的四线制触摸屏的坐标。但是我在每个角落都得到了这样的值(见图I)。

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现在，我希望获得与我的触摸屏大小匹配的值。我以前试过，但每次我触摸触摸屏时，我的测量都失败了1厘米。

我的代码如下：

#define Yin  A0
#define Yout A1
#define Xin  A2
#define Xout A3
int values[2];

void setup()
{
  pinMode(Xin,  INPUT);
  pinMode(Yin, INPUT);
  pinMode(Xout, INPUT);
  pinMode(Yout, INPUT);

  Serial.begin(9600);
}
void loop()
{   
    pinMode(Yin, OUTPUT);
    pinMode(Yout, OUTPUT);
    digitalWrite(Yin, LOW);
    digitalWrite(Yout, HIGH);
    delay(5); // Pause to allow lines to power up
    // Read and store X
    values[0] = analogRead(Xin);
    // Reset Y
    digitalWrite(Yout, LOW);
    delay(5); // Pause to allow lines to power down
    pinMode(Yin, INPUT);
    pinMode(Yout, INPUT);
    
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Read Y
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Set X to a gradient
    pinMode(Xin, OUTPUT);
    pinMode(Xout, OUTPUT);
    digitalWrite(Xin, LOW);
    digitalWrite(Xout, HIGH);
    delay(5); // Pause to allow lines to power up
    // Read and store Y
    values[1] = analogRead(Yin);
    // Reset X
    digitalWrite(Xout, LOW);
    delay(5); // Pause to allow lines to power down
    pinMode(Xin, INPUT);
    pinMode(Xout, INPUT);
    delay(250);
    
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Output our values
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Serial.print(values[0]);
    Serial.print("\t");
    Serial.println(values[1]);
           
  }

我的目标是将触摸屏的原点放在中间，并以厘米为单位获取每个位置的值。(见图二。)

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提前感谢！

Answer 1

我得到了答案，我必须在X和Y的输出中输入两行额外的代码。

看这里：

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#define Yin  A0
#define Yout A1
#define Xin  A2
#define Xout A3

 double korrX = 1.2;
 double korrY = 1.1;

double values[2];

void setup()
{
  pinMode(Xin,  INPUT);
  pinMode(Yin, INPUT);
  pinMode(Xout, INPUT);
  pinMode(Yout, INPUT);
 

  Serial.begin(9600);
}

void loop()
{
  
    pinMode(Yin, OUTPUT);
    pinMode(Yout, OUTPUT);
    digitalWrite(Yin, LOW);
    digitalWrite(Yout, HIGH);
    delay(5); // Pause to allow lines to power up
    // Read and store X
    values[0] = analogRead(Xin);
    values[0] = values[0] -507;
    values[0] = (11.4*values[0]/507)*korrX;
    // Reset Y
    digitalWrite(Yout, LOW);
    delay(5); // Pause to allow lines to power down
    pinMode(Yin, INPUT);
    pinMode(Yout, INPUT);
    
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Read Y
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Set X to a gradient
    pinMode(Xin, OUTPUT);
    pinMode(Xout, OUTPUT);
    digitalWrite(Xin, LOW);
    digitalWrite(Xout, HIGH);
    delay(5); // Pause to allow lines to power up
    // Read and store Y
    values[1] = analogRead(Yin);
    values[1] = values[1] -501;
    values[1] = (15.2*values[1]/501)*korrY;
    // Reset X
    digitalWrite(Xout, LOW);
    delay(5); // Pause to allow lines to power down
    pinMode(Xin, INPUT);
    pinMode(Xout, INPUT);
    delay(250);
    
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Output our values
    //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Serial.print(values[0]);
    Serial.print("\t");
    Serial.println(values[1]);
    
    
  }

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