# 用Tinkercad学arduino之 校准 根据前五秒的读数定义输出的最大值和最小值

/*
Calibration
校准

Demonstrates one technique for calibrating sensor input.  The
sensor readings during the first five seconds of the sketch
execution define the minimum and maximum of expected values
attached to the sensor pin.

演示了一种用于校准传感器输入的技术。 传感器读取光敏电阻前五秒内的读数
定义了连接到传感器的引脚的最小值和最大值。

The sensor minimum and maximum initial values may seem backwards.
Initially, you set the minimum high and listen for anything
lower, saving it as the new minimum. Likewise, you set the
maximum low and listen for anything higher as the new maximum.

传感器的最小和最大初始值似乎向后。
最初，您设置了最低的高音并聆听任何声音
降低，将其另存为新的最小值。 同样，您将
最大低，并听取任何新的最大。

The circuit:
* Analog sensor (potentiometer will do) attached to analog input 0
* LED attached from digital pin 9 to ground

电路：
*模拟传感器（电位计可用）连接到模拟输入0
* LED从数字引脚9接地
*
*
created 29 Oct 2008
By David A Mellis
modified 30 Aug 2011
By Tom Igoe

http://www.arduino.cc/en/Tutorial/Calibration

This example code is in the public domain.

*/

// These constants won't change:
const int sensorPin = A0;    // pin that the sensor is attached to
const int ledPin = 9;        // pin that the LED is attached to

// variables:
int sensorValue = 0;         // the sensor value
int sensorMin = 1023;        // minimum sensor value
int sensorMax = 0;           // maximum sensor value

void setup() {
// turn on LED to signal the start of the calibration period:
pinMode(13, OUTPUT);
digitalWrite(13, HIGH);

// calibrate during the first five seconds
while (millis() < 5000) {
sensorValue = analogRead(sensorPin);

// record the maximum sensor value
if (sensorValue > sensorMax) {
sensorMax = sensorValue;
}

// record the minimum sensor value
if (sensorValue < sensorMin) {
sensorMin = sensorValue;
}
}

// signal the end of the calibration period
digitalWrite(13, LOW);
}

void loop() {
// read the sensor:
sensorValue = analogRead(sensorPin);

// apply the calibration to the sensor reading
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);

// in case the sensor value is outside the range seen during calibration
sensorValue = constrain(sensorValue, 0, 255);

// fade the LED using the calibrated value:
analogWrite(ledPin, sensorValue);
}    

posted @ 2020-12-03 10:39  meetrice  阅读(28)  评论(0编辑  收藏