ESP32 的 Serial2 没有响应(NEO 6M GPS) [英] Serial2 of ESP32 not responding( NEO 6M GPS)
问题描述
我正在做一个自动驾驶汽车项目，我有一个 NEO 6M GPS 模块，我使用的是 Esp32 作为电路板，该模块与 Arduino 和 Nodemcu 配合良好.但不是 ESP32，原因是它不支持软件序列，所以我从 https://www.youtube.com/watch?v=GwShqW39jlE&feature=emb_title
I am doing an Autonomous Car project and I have a NEO 6M GPS module, I am using an ESp32 as the board, the module works fine with Arduino and Nodemcu. but not with ESP32, the reason being it not supporting software serial, so I took help from https://www.youtube.com/watch?v=GwShqW39jlE&feature=emb_title
我添加了硬件串行，但仍然没有输出我提供了下面的代码
I added hardware serial but still, there is no output I have provided the code below
#include<HardwareSerial.h>//No extra libray installed
#define RXD2 16
#define TXD2 17
HardwareSerial gps_serial(2);
void setup() {
Serial.begin(115200);
Serial.printf("LETS START");
gps_serial.begin(115200, SERIAL_8N1, RXD2, TXD2);
}
void loop() {
while (gps_serial.available()) {
Serial.print(char(gps_serial.read())); // read from gps, write to serial debug port
Serial.print("I am here");
}
}
串口监视器上的输出是LETS START下面还提供了在其他板上工作的其他代码，编辑后可以在 ESP32 上工作
The output on the serial monitor is LETS START
The other code which worked on other boards is also provided below, edited to work in ESP32
#include <WiFi.h>
//#include <WiFiClient.h>
#include <WiFiServer.h>
#include <TinyGPS++.h> // library for GPS module
//#include <SoftwareSerial.h>
//#include <ESP8266WiFi.h>
TinyGPSPlus gps; // The TinyGPS++ object
//SoftwareSerial ss(4, 5); // The serial connection to the GPS device
HardwareSerial Serial2(2);
const char* ssid = "***********"; //ssid of your wifi
const char* password = "***********"; //password of your wifi
float latitude , longitude;
int year , month , date, hour , minute , second;
String date_str , time_str , lat_str , lng_str;
int pm;
WiFiServer server(80);
void setup()
{ Serial2.begin(115200);
Serial.begin(115200);
//ss.begin(9600);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password); //connecting to wifi
while (WiFi.status() != WL_CONNECTED)// while wifi not connected
{
delay(500);
Serial.print("."); //print "...."
}
Serial.println("");
Serial.println("WiFi connected");
server.begin();
Serial.println("Server started");
Serial.println(WiFi.localIP()); // Print the IP address
}
void loop()
{
while (Serial2.available() > 0) //while data is available
if (gps.encode(Serial2.read())) //read gps data
{
if (gps.location.isValid()) //check whether gps location is valid
{
latitude = gps.location.lat();
lat_str = String(latitude , 6); // latitude location is stored in a string
longitude = gps.location.lng();
lng_str = String(longitude , 6); //longitude location is stored in a string
}
if (gps.date.isValid()) //check whether gps date is valid
{
date_str = "";
date = gps.date.day();
month = gps.date.month();
year = gps.date.year();
if (date < 10)
date_str = '0';
date_str += String(date);// values of date,month and year are stored in a string
date_str += " / ";
if (month < 10)
date_str += '0';
date_str += String(month); // values of date,month and year are stored in a string
date_str += " / ";
if (year < 10)
date_str += '0';
date_str += String(year); // values of date,month and year are stored in a string
}
if (gps.time.isValid()) //check whether gps time is valid
{
time_str = "";
hour = gps.time.hour();
minute = gps.time.minute();
second = gps.time.second();
minute = (minute + 30); // converting to IST
if (minute > 59)
{
minute = minute - 60;
hour = hour + 1;
}
hour = (hour + 5) ;
if (hour > 23)
hour = hour - 24; // converting to IST
if (hour >= 12) // checking whether AM or PM
pm = 1;
else
pm = 0;
hour = hour % 12;
if (hour < 10)
time_str = '0';
time_str += String(hour); //values of hour,minute and time are stored in a string
time_str += " : ";
if (minute < 10)
time_str += '0';
time_str += String(minute); //values of hour,minute and time are stored in a string
time_str += " : ";
if (second < 10)
time_str += '0';
time_str += String(second); //values of hour,minute and time are stored in a string
if (pm == 1)
time_str += " PM ";
else
time_str += " AM ";
}
}
WiFiClient client = server.available(); // Check if a client has connected
if (!client)
{
return;
}
// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n <!DOCTYPE html> <html> <head> <title>GPS DATA</title> <style>";
s += "a:link {background-color: YELLOW;text-decoration: none;}";
s += "table, th, td </style> </head> <body> <h1 style=";
s += "font-size:300%;";
s += " ALIGN=CENTER> GPS DATA</h1>";
s += "<p ALIGN=CENTER style=""font-size:150%;""";
s += "> <b>Location Details</b></p> <table ALIGN=CENTER style=";
s += "width:50%";
s += "> <tr> <th>Latitude</th>";
s += "<td ALIGN=CENTER >";
s += lat_str;
s += "</td> </tr> <tr> <th>Longitude</th> <td ALIGN=CENTER >";
s += lng_str;
s += "</td> </tr> <tr> <th>Date</th> <td ALIGN=CENTER >";
s += date_str;
s += "</td></tr> <tr> <th>Time</th> <td ALIGN=CENTER >";
s += time_str;
s += "</td> </tr> </table> ";
s += "</body> </html>";
client.print(s); // all the values are send to the webpage
delay(100);
}
当我运行它时，我确实在串行监视器上获得了 IP 地址，但是当我访问该地址时，该字段为空.所以我的理解是与 GPS 模块的串行通信不起作用.我在网上尝试了许多其他解决方案，但根本没有用.
I do get the IP address on the serial monitor when I run it but when I access that address the fields are blank. So what I understand is that the Serial communication with the GPS module is not working. I tried many other solutions on net but no use at all.
我使用的是 ESP32 DevKit V1，30 针版本
推荐答案
不知道你具体使用的是哪个 ESP32 Module，有两个显示塞子
NEO-6M GPS 模块需要 5 V，ESP32 引脚提供最大 3.6V - 通常为 3.3V
一些 ESP32 模块会阻止某些引脚将它们用于 SD 卡、相机、液晶显示器或其他板载功能.因此，请查看您的 esp32 板变体的数据表.
如果 HWSerial2 存在，代码应该没问题如果您使用低于 1.03 的 ESP32 版本，则必须定义 HWSerial，
ESP32 1.04 以上不再需要
Not knowing which ESP32 Module you use exactly, there are two show stoppers
NEO-6M GPS Module needs 5 V, ESP32 pins deliver max 3.6V - normaly 3.3V
Some ESP32 modules block certain pins to use them for SD card, camera, lcd or other on board features. So look up the datasheet of your esp32 board variant.
The code should be ok if HWSerial2 exists
If you use ESP32 version below 1.03 you have to define HWSerial,
ESP32 1.04 up this is not necessary any more
#define RXD2 16
#define TXD2 17
...
HardwareSerial Serial2(2);
...
Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2);
为GSM模块提供5V电源.
and 5V power is supplied to the GSM module.
感谢hcheung询问最基本的事情
解决方案是 OP 有 RX 到 RX 和 TX 到 TX，而不是 RX ESP 引脚到 GPS 上的 RX，反之亦然.问题解决了
Edit 2: Credit to hcheung asking the most basic thing
The solution was the OP had RX to RX and TX to TX, instead of RX ESP pin to RX on GPS and vice versa.
So problem solved
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