使用阵列获取传感器平均值

首先，让我明确一点：我是一个彻头彻尾的傻瓜，我几乎没有编程经验，我知道我不在我的行列中，但我想学习和理解。问题来了。以下代码用于使用4个继电器控制加热垫，这些继电器根据4个lm35温度传感器检测到的温度而关闭/打开。因为这些传感器有时会跳动，我想从50个读数中获得平均温度，并让代码检查数据，而不是原始温度读数。我有arduino的代码(我写了一些代码，其他论坛上的人把它修改了，使它更短(这有点让我迷失了方向，但代码有效)然后我搜索了平滑数据，得到了一段代码，它完全符合我的要求：制作一个数组，计算平均温度，并不断删除和添加新数据。

我试着把这两个代码连接在一起，结果出现了各种各样的错误，哈哈我来了。

没有平均数据的代码是这样的：

const byte tempPin[] = {A1, A2, A3, A4};
const byte relayPin[] = {6, 7, 8, 9};
// hysteresis = upperLimit - lowerLimit
const byte lowerLimit = 24;
const byte upperLimit = 31;
float tempC[4];
word reading[4];

word printInterval = 1000; // 1 second
unsigned long printCheck = 0, lastPrintTime = 0;
void setup()
{
analogReference(INTERNAL);
Serial.begin(115200);
for (int i = 0; i < 4; i++) {
pinMode(relayPin[i], INPUT_PULLUP);
pinMode(relayPin[i], OUTPUT); // defaults HIGH, relay OFF
}
}
void loop()
{
// readings and control
for (int i = 0; i < 4; i++) {
reading[i] = analogRead(tempPin[i]);
tempC[i] = reading[i] / 9.31;

if (tempC[i] < lowerLimit) {
digitalWrite(relayPin[i], LOW);   //relay OFF
}
else if (tempC[i] > upperLimit) {
digitalWrite(relayPin[i], HIGH);  // relay ON
}
}
printCheck = millis() - lastPrintTime;
if (printCheck >= printInterval) {
for (int i = 0; i < 4; i++) {
Serial.print("tempC");
Serial.print(i + 1);
Serial.print(" ");
Serial.println(tempC[i]);
}
Serial.println();
lastPrintTime = millis(); // reset print timer
}
}

我从Arduino学习中心得到的平均代码是这样的：

/*
Smoothing
Reads repeatedly from an analog input, calculating a running average
and printing it to the computer.  Keeps ten readings in an array and
continually averages them.
The circuit:
* Analog sensor (potentiometer will do) attached to analog input 0
Created 22 April 2007
By David A. Mellis  <dam@mellis.org>
modified 9 Apr 2012
by Tom Igoe
http://www.arduino.cc/en/Tutorial/Smoothing
This example code is in the public domain.

*/

// Define the number of samples to keep track of.  The higher the number,
// the more the readings will be smoothed, but the slower the output will
// respond to the input.  Using a constant rather than a normal variable lets
// use this value to determine the size of the readings array.
const int numReadings = 10;
int readings[numReadings];      // the readings from the analog input
int readIndex = 0;              // the index of the current reading
int total = 0;                  // the running total
int average = 0;                // the average
int inputPin = A0;
void setup() {
// initialize serial communication with computer:
Serial.begin(9600);
// initialize all the readings to 0:
for (int thisReading = 0; thisReading < numReadings; thisReading++) {
readings[thisReading] = 0;
}
}
void loop() {
// subtract the last reading:
total = total - readings[readIndex];
// read from the sensor:
readings[readIndex] = analogRead(inputPin);
// add the reading to the total:
total = total + readings[readIndex];
// advance to the next position in the array:
readIndex = readIndex + 1;
// if we're at the end of the array...
if (readIndex >= numReadings) {
// ...wrap around to the beginning:
readIndex = 0;
}
// calculate the average:
average = total / numReadings;
// send it to the computer as ASCII digits
Serial.println(average);
delay(1);        // delay in between reads for stability
}

我创建的加入两个代码的怪物是这样的：

const byte tempPin[] = {A1, A2, A3, A4};
const byte relayPin[] = {6, 7, 8, 9};
// hysteresis = upperLimit - lowerLimit
const byte lowerLimit = 24;
const byte upperLimit = 31;
float tempC[4];
word reading[4];
const int numReadings = 50;
int readings[numReadings];
int readIndex = 0;
int total = 0;
float average[4];

word printInterval = 1000; // 1 second
unsigned long printCheck = 0, lastPrintTime = 0;
void setup()
{
analogReference(INTERNAL);
Serial.begin(115200);
for (int i = 0; i < 4; i++) {
pinMode(relayPin[i], INPUT_PULLUP);
pinMode(relayPin[i], OUTPUT); // defaults HIGH, relay OFF
}
for (int thisReading = 0; thisReading < numReadings; thisReading++){
readings[thisReading] = 0;
}
}
void loop()
{
// readings and control
for (int i = 0; i < 4; i++) {
reading[i] = analogRead(tempPin[i]);
tempC[i] = reading[i] / 9.31;
total[i] = total[i] - readings[readIndex];
readings[readIndex] = tempC[i]
total[i] = total[i] + readings[readIndex]
readIndex[i] = readIndex[i] + 1 ;
if (readIntex[i] >= numReadings) {
readIndex = 0;
}
average[i] = total[i] / numReadings;
if (average[i] < lowerLimit) {
digitalWrite(relayPin[i], LOW);   //relay OFF
}
else if (average[i] > upperLimit) {
digitalWrite(relayPin[i], HIGH);  // relay ON
}
}
printCheck = millis() - lastPrintTime;
if (printCheck >= printInterval) {
for (int i = 0; i < 4; i++) {
Serial.print("tempC");
Serial.print(i + 1);
Serial.print(" ");
Serial.println(tempC[i]);
}
Serial.println();
lastPrintTime = millis(); // reset print timer
}
}

这些是我得到的错误：

Arduino: 1.6.8 (Windows 7), Board: "Arduino/Genuino Uno"
temprelayfinal2.ino: In function 'void loop()':
temprelayfinal2:40: error: invalid types 'int[int]' for array subscript
total[i] = total[i] - readings[readIndex];
^
temprelayfinal2:40: error: invalid types 'int[int]' for array subscript
total[i] = total[i] - readings[readIndex];
^
temprelayfinal2:42: error: expected ';' before 'total'
total[i] = total[i] + readings[readIndex]
^
temprelayfinal2:44: error: 'readIntex' was not declared in this scope
if (readIntex[i] >= numReadings) {
^
temprelayfinal2:47: error: invalid types 'int[int]' for array subscript
average[i] = total[i] / numReadings;
^
exit status 1
invalid types 'int[int]' for array subscript
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