参考博客：ESP8266(NODEMCU)Arduino环境下实现多个软串口通信
接线方式：
D5——D8
D6——D7
实验原理与步骤
通过向硬串口发送Show time 字符串激活单片机去更新网络时间，然后通过软串口一发出，然后硬串口会打出串口二接收到的数据。模拟了两个单片机实现串口通信的过程。
代码
#include <NTPClient.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <SoftwareSerial.h>
SoftwareSerial uart1(14,12);//RX=d5,TX=d6
SoftwareSerial uart2(13,15);//RX=d7,TX=d8
//ESP8266 NODEMCU
const char *ssid = "your wifi name ";
const char *password = "your wifi password";
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "ntp1.aliyun.com",60*60*8, 30*60*1000);
void setup()
{
Serial.begin(9600);
uart1.begin(9600);
uart2.begin(9600);
uart1.listen();
uart2.listen();
pinMode(LED_BUILTIN, OUTPUT); // Initialize the LED_BUILTIN pin as an output
WiFi.begin(ssid, password);
while ( WiFi.status() != WL_CONNECTED ) {
delay ( 500 );
Serial.print ( "." );
digitalWrite(LED_BUILTIN, HIGH);
}
timeClient.begin();
}
String time1="";
bool dian=false;
int h,m,s,d;
String uart1string="";
String uart2string="";
void loop()
{
if(Serial.available()>0){
if(Serial.peek()!=‘\n‘){
uart1string+=(char)Serial.read();
}
else{
Serial.read();
if(uart1string=="Show time"){
timeClient.update();
time1=timeClient.getFormattedTime();
uart1.println(time1);
}
uart1string="";
}
}
if(uart2.available()>0){
if(uart2.peek()!=‘\n‘){
uart2string+=(char)uart2.read();
}
else{
uart2.read();
Serial.print("UART2 DATA:");
Serial.println(uart2string);
uart2.println(uart2string);
}
}
/*Serial.println("ok");
timeClient.update();
time1=timeClient.getFormattedTime();
d=timeClient.getDay();
h=timeClient.getHours();
m=timeClient.getMinutes();
s=timeClient.getSeconds();
Serial.print(d);Serial.print(" ");Serial.print(h);Serial.print(":");Serial.print(m);Serial.print(":");Serial.println(s);
delay(1000);*/
}