双ESP32高频传输XY摇杆数据 - WIFI模块UDP协议

前要

• 并不推荐此方法
• 发热量较高
• 延迟大概在半秒钟左右(自我感觉, 仅参考)

ESP32 使用WIFI UDP协议通信

• ESP32主: 读取XY摇杆数值并通过UDP发送到从机, 每50毫秒发一次
  • X轴左到右的值读取范围为模拟量0~4095
  • Y轴上到下的值读取范围为模拟量0~4095
  • Key按下为数字输入0或1
• ESP32从: 接收到从机数据直接打印到串口

实际效果

• 左边ESP32主机连接XY摇杆, 并发送UDP数据
• 右边ESP32从机, 只进行接收并连接到电脑串口打印

串口打印输出, 第一位为X轴数据, 第二位为Y轴数据, 第三位为是否按下

ESP32主机/XY摇杆读取/UDP发送

实际代码

#define STASSID "209"
#define STAPSK "xinxi209"
#include 
#include 

const char AP_NameChar[] = "WIFI-SSID";
const char WiFiAPPSK[] = "WIFI-PSK";
IPAddress ESP8266ip1(192,168,4,2);
IPAddress ESP8266ip2(192,168,4,3);
IPAddress ESP8266ip(192,168,4,255);
unsigned int localPort =8080;
unsigned int remotePort=8080;
char incomingPacket[537];
char A;
WiFiUDP Udp;
volatile int x_value;
volatile int y_value;
volatile int key_value;

void setup(){
  Serial.begin(9600);
  WiFi.mode(WIFI_AP_STA);
  WiFi.softAP(AP_NameChar, WiFiAPPSK);
  WiFi.begin(STASSID, STAPSK);
  Udp.begin(localPort);
  Serial.println();
  Serial.println("Started ap. Local ip: " + WiFi.localIP().toString());
  x_value = -1;
  y_value = -1;
  key_value = -1;
  pinMode(35, INPUT);
  pinMode(32, INPUT);
  pinMode(33, INPUT);
}

void loop(){
  x_value = analogRead(32);
  y_value = analogRead(33);
  key_value = digitalRead(35);
  Udp.beginPacket("192.168.4.2",remotePort);
  Udp.print(String(x_value) + String(",") + String(y_value) + String(",") + String(key_value));
  Udp.endPacket();
  delay(50);

}

ESP32从机/接收UDP数据/串口打印输出

 实际代码

#define STASSID "WIFI-SSID"
#define STAPSK "WIFI-PSK"
#include 
#include 

unsigned int localPort =8080;
unsigned int remotePort=8080;
char incomingPacket[537];
char A;
WiFiUDP Udp;

void setup(){
  Serial.begin(9600);
  WiFi.mode(WIFI_STA);
  WiFi.begin(STASSID, STAPSK);
  while (WiFi.status() != WL_CONNECTED)
  {
  Serial.print(".");
  delay(500);
  }
  delay(1000);
  Serial.println();
  Serial.print("Connected! IP address: ");
  Serial.println(WiFi.localIP());
  Serial.printf("UDP server on port  ", localPort);
  Udp.begin(localPort);
  Serial.begin(9600);
}

void loop(){
  int packetSize = Udp.parsePacket();
  if (packetSize)
  {
  Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
  int len = Udp.read(incomingPacket, 536);
  if (len > 0)
  {
  incomingPacket[len] = 0;
  Serial.printf("UDP packet contents: %s\n", incomingPacket);
  String COM=incomingPacket;
    Serial.println(COM);
  }
  }

}