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发表于 2017-12-4 20:20:02
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显示全部楼层
摘取了你的G5程序,但是串口监视器那什么都没有,因为我的传感器是一个原来的学长留下来的,所以没有例程,只能借用你的了,帮忙看看程序哪错了,谢谢。
#include <SoftwareSerial.h>
SoftwareSerial mySerial(9, 10);
struct PARAMS {
float T;//显示温度
float H;//显示湿度
long P;//显示PM2.5
long _P;//读取PM2.5
} _params;
//G5 相关变量
static unsigned char ucRxBuffer[250];
static unsigned char ucRxCnt = 0;
//循环计数器
unsigned char loopCnt = 0;
void setup() {
Serial.begin(9600);
//软串口读取G5
mySerial.begin(9600);
delay(500);
}
//获取PM2.5的值
void getPM25(unsigned char ucData) {
ucRxBuffer[ucRxCnt++] = ucData;
if (ucRxBuffer[0] != 0x42 && ucRxBuffer[1] != 0x4D) {
ucRxCnt = 0;
}
if (ucRxCnt > 31) {
_params._P = (float)ucRxBuffer[6] * 256 + (float)ucRxBuffer[7]; //美国标准
// _params._P = (float)ucRxBuffer[12] * 256 + (float)ucRxBuffer[13]; //中国标准
ucRxCnt = 0;
}
}
//中位值平均滤波,处理PM2.5的值
#define FILTER_N 5
int Filter() {
int i;
int filter_sum = 0;
int filter_max, filter_min;
int filter_buf[FILTER_N];
for (i = 0; i < FILTER_N; i++) {
filter_buf[i] = _params._P;
delay(1);
}
filter_max = filter_buf[0];
filter_min = filter_buf[0];
filter_sum = filter_buf[0];
for (i = FILTER_N - 1; i > 0; i--) {
if (filter_buf[i] > filter_max)
filter_max = filter_buf[i];
else if (filter_buf[i] < filter_min)
filter_min = filter_buf[i];
filter_sum = filter_sum + filter_buf[i];
filter_buf[i] = filter_buf[i - 1];
}
i = FILTER_N - 2;
filter_sum = filter_sum - filter_max - filter_min + i / 2; // +i/2 的目的是为了四舍五入
filter_sum = filter_sum / i;
return filter_sum;
}
void loop() {
while (mySerial.available()) {
getPM25(mySerial.read());
}
_params.P = Filter();
} |
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