sds011粉尘模块if生效求教
程序如下，红字标识部分为判断，但是奇怪的是三种都输出了，默认刚烧录完Pm2.5应该是0，小屏幕上也是显示Pm2.5为0.判断没作用，求支招
#include "U8glib.h"
unsigned int Pm25 = 0;
unsigned int Pm10 = 0;
//Com: D0..D7: 8,9,10,11,4,5,6,7 cs1=14, cs2=15,di=17,rw=16,reset = 16
U8GLIB_SSD1306_128X64 u8g(13, 12, 11, 10);// SW SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9
void draw() {
// 设置字体
u8g.setFont(u8g_font_7x14);
// 设置文字及其显示位置
u8g.drawStr( 0, 10, "By MS17E2 Martinxu");
u8g.drawStr( 0, 30, "Pm2.5:");
u8g.setPrintPos(47,30); //设置位置
u8g.print(Pm25);//打印内容
if (Pm<=35)
{u8g.drawStr( 70, 30, "good");}
if (35<Pm<=75)
{u8g.drawStr( 70, 30, "moderate");}
if (75<Pm)
{u8g.drawStr( 70, 30, "bad");}
u8g.drawStr( 0, 40, "Pm10:");
u8g.setPrintPos(43,40); //设置位置
u8g.print(Pm10); //打印内容
}
void ProcessSerialData()
{
uint8_t mData = 0;
uint8_t i = 0;
uint8_t mPkt = {0};
uint8_t mCheck = 0;
while (Serial.available() > 0)
{
// from www. inovafitness. com
// packet format: AA C0 PM25_Low PM25_High PM10_Low PM10_High 0 0 CRC AB
mData = Serial.read(); delay(2);//wait until packet is received
if(mData == 0xAA)//head1 ok
{
mPkt =mData;
mData = Serial.read();
if(mData == 0xc0)//head2 ok
{
mPkt =mData;
mCheck = 0;
for(i=0;i < 6;i++)//data recv and crc calc
{
mPkt = Serial.read();
delay(2);
mCheck += mPkt;
}
mPkt = Serial.read();
delay(1);
mPkt = Serial.read();
if(mCheck == mPkt)//crc ok
{
Serial.flush();
Pm25 = (uint16_t)mPkt | (uint16_t)(mPkt<<8);
Pm10 = (uint16_t)mPkt | (uint16_t)(mPkt<<8);
if(Pm25 > 9999)
Pm25 = 9999;
if(Pm10 > 9999)
Pm10 = 9999;
//get one good packet
return;
}
}
}
}
}
void setup() {
Serial.begin(9600);
Pm25=0;
Pm10=0;
}
// 主循环
void loop() {
ProcessSerialData();
// u8glib图片循环结构：
u8g.firstPage();
do {
draw();
}
while( u8g.nextPage() );
delay(1000);
}
if (Pm<=35)
{u8g.drawStr( 70, 30, "good");}
else if (Pm>35&&Pm<=75)
{u8g.drawStr( 70, 30, "moderate");}
else if (Pm>75)
{u8g.drawStr( 70, 30, "bad");} Paderboy 发表于 2017-7-2 08:41
if (Pm35&&Pm75)
{u8g.drawStr( 70, 30, "bad");}
可以了，但有个问题，pm25为0，即使我不用else也只是会拖慢速度而已啊，其他的比如，大于35小于75，或大于75的应该是不会失效才对的啊
页:
[1]