ESP32 直接使用WIFI进行UDP通信, 将光敏电阻传感器数值, 显示在OLED上 - 米思齐/Arduino

ESP32 使用WIFI UDP协议通信

• ESP32主: 读取光敏传感器数值, 并通过UDP发送
• ESP32从: 读取主机发送的数值, 并显示在OLED显示屏上

实际效果

• 左边为ESP32, 连接OLED, 为STA模式从机
• 右边为ESP32, 连接光敏传感器, 为AP+STA主机, 可连接外网和连接从机

ESP32 主 - AP/STA 发送数据

#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 lightData;

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());
    lightData = -1;
    pinMode(36, INPUT);
    pinMode(36, INPUT);
    Serial.begin(9600);
}

void loop(){
    lightData = 100 - round((String(analogRead(36)).toInt() / 4095.0) * 100);
    Serial.println(lightData);
    if (lightData < 40) {
        Udp.beginPacket("192.168.4.2",remotePort);
        Udp.print(lightData);
        Udp.endPacket();

    } else {
        Udp.beginPacket("192.168.4.2",remotePort);
        Udp.print(lightData);
        Udp.endPacket();

    }
    delay(1000);

}

 ESP32 从 - STA 接受数据显示数据

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

unsigned int localPort =8080;
unsigned int remotePort=8080;
char incomingPacket[537];
char A;
WiFiUDP Udp;
U8G2_SSD1306_128X64_NONAME_1_4W_SW_SPI u8g2(U8G2_R0, 18,23,4, 16, 17);
String lightData;

void page1() {
    u8g2.setFont(u8g2_font_timR24_tf);
    u8g2.setFontPosTop();
    u8g2.setCursor(0,20);
    u8g2.print(lightData);
}

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);
    u8g2.begin();
    lightData = "-1";
    u8g2.firstPage();
    do
        {
            page1();
        }while(u8g2.nextPage());
    u8g2.enableUTF8Print();

}

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;
            lightData = COM;
            u8g2.firstPage();
            do
                {
                    page1();
                }while(u8g2.nextPage());
        }
    }

}