我正在一个项目上,遇到了一些问题。
我正在使用 DHT11温度传感器, Arduino Uno 和 TFT LCD显示屏2.2英寸型号ITDB02-2.2 。
>我希望我的项目要做的是对传感器使用2种功能模式,可以在程序开始时从键盘上进行选择(一种是正常模式,一种是在特殊场合使用的模式)(所以我需要串行通信。
我注意到如果以任何速率开始串行通信,屏幕将无法运行,因此我将Arduino Serial.begin(9600)
和Serial.end()
用于程序的模式选择部分。
问题:即使我结束了串行通信并且看起来像这样,我的Arduino仍在通过串行端口发送数据:
我发现Serial.end()
函数不会关闭串行通讯,而只会断开通讯速率。我很好奇,如果您有什么想法可以用来消除多余的数据,在计算机收到数据之前先忽略它。
我被困住了。我以为打扰会是一个解决方案,但它不像我在互联网上研究的那样。
我的ARDUINO代码:
#include <SimpleDHT.h>
#include <UTFT.h>
UTFT myGLCD(ITDB22,A5,A4,A3,A2);
SimpleDHT11 dht11;
// Declare which fonts we will be using
extern uint8_t BigFont[];
//dht sensor data pin
int dataPinSensor1 = 12;
char mode;
int del;
void setup()
{
Serial.begin(9600);
Serial.print("Select functioning mode");
mode=SensorModeSelect(mode);
Serial.end();
pinMode(12, INPUT);
}
void loop()
{
if(mode=='1') {
FirstFuncMode(dataPinSensor1);
}
if(mode=='2') {
SecondFuncMode(dataPinSensor1,del);
}
delay(10);
}
char SensorModeSelect(char in)
{
char mode='0';
while(mode=='0') {
if(Serial.available() > 0) {
mode=Serial.read();
}
}
if (mode == '1') {
Serial.print("\nMOD1 SELECTED: press t key to aquire data \n");
}
if (mode == '2') {
Serial.print("\nMOD2 SELECTED: press q if you want to quit auto mode \n");
Serial.print("Select the data aquisition period(not smaller than 1 second) \n");
}
return mode;
}
int DataAqPeriod()
{
int del=0;
while(del==0) {
while(Serial.available() > 0) {
//Get char and convert to int
char a = Serial.read();
int c = a-48;
del *= 10;
del += c;
delay(10);
}
}
del*=1000;
return del;
}
void FirstFuncMode(int dataPinSensor1)
{
byte temperature = 0;
byte humidity = 0;
int err = SimpleDHTErrSuccess;
bool DispCond=false;
Serial.begin(9600);
delay(1500);
if (Serial.read() == 't' ) {
DispCond=true;
//read temperature and compare it with an error value
if((err = dht11.read(dataPinSensor1, &temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
Serial.print("unreliable measurement or unselected functioning mode");
}
byte f = temperature * 1.8 + 32;
Serial.print((int)temperature);
Serial.print(" *C, ");
Serial.print((int)f);
Serial.print(" *F, ");
Serial.print((int)humidity);
Serial.println(" H humidity");
delay(1500);
}
Serial.end();
if(DispCond==true) {
//Setup the LCD
myGLCD.InitLCD();
myGLCD.setFont(BigFont);
//print value on LCD
displayNoInit((int)temperature,(int)humidity);
}
}
void SecondFuncMode(int dataPinSensor1,int del)
{
bool q=false;
byte temperature = 0;
byte humidity = 0;
int err = SimpleDHTErrSuccess;
Serial.begin(9600);
del=DataAqPeriod();
Serial.end();
//Setup the LCD
myGLCD.InitLCD();
myGLCD.setFont(BigFont);
while(q==false) {
Serial.begin(9600);
//read temperature and compare it with an error value
if((err = dht11.read(dataPinSensor1, &temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
Serial.print("unreliable measurement or unselected functioning mode \n");
}
float f = temperature * 1.8 + 32;
Serial.print((int)temperature);
Serial.print(" *C, ");
Serial.print((int)f);
Serial.print(" *F, ");
Serial.print((int)humidity);
Serial.println(" H humidity");
delay(del);
if(Serial.read() == 'q')
q=true;
Serial.end();
displayNoInit((int)temperature,(int)humidity);
delay(10);
}
}
void displayNoInit(int temperature,int humidity)
{
//effective data display
myGLCD.clrScr();
myGLCD.setColor(255, 255, 0);
myGLCD.setBackColor(10,10,10);
myGLCD.print(" Temperature ", CENTER, 10);
myGLCD.setColor(254, 254, 254);
myGLCD.printNumI(temperature, CENTER, 45);
myGLCD.setColor(255, 255, 0);
myGLCD.print("C ", RIGHT, 45);
myGLCD.print("Relative Hum.", CENTER, 90);
myGLCD.setColor(204, 245, 250);
myGLCD.printNumI(humidity, CENTER, 120);
myGLCD.print("%", RIGHT, 120);
}
答案 0 :(得分:1)
您的定义是正确的,Serial.end()
不会禁用串行监视器,而只会禁用中断。调用Serial.end()
后,您可以像这样禁用串行监视器。
#include <avr/io.h>
// Save status register, disable interrupts
uint8_t oldSREG = SREG;
cli();
// Disable TX and RX
cbi(UCSRB, RXEN);
cbi(UCSRB, TXEN);
// Disable RX ISR
cbi(UCSRB, RXCIE);
// Flush the internal buffer
Serial.flush();
// Restore status register
SREG = oldSREG;