ESP32 使用WIFI UDP協(xié)議通信

• ESP32主: 讀取光敏傳感器數(shù)值, 并通過UDP發(fā)送
• ESP32從: 讀取主機(jī)發(fā)送的數(shù)值, 并顯示在OLED顯示屏上

實(shí)際效果

• 左邊為ESP32, 連接OLED, 為STA模式從機(jī)
• 右邊為ESP32, 連接光敏傳感器, 為AP+STA主機(jī), 可連接外網(wǎng)和連接從機(jī)

ESP32 主 - AP/STA 發(fā)送數(shù)據(jù)

#define STASSID "209"
#define STAPSK "xinxi209"
#include <WiFi.h>
#include <WiFiUDP.h>

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 從 - STA 接受數(shù)據(jù)顯示數(shù)據(jù)

文章來源地址http://www.zghlxwxcb.cn/news/detail-538490.html

#define STASSID "WIFI-SSID"
#define STAPSK "WIFI-PSK"
#include <WiFi.h>
#include <WiFiUdp.h>
#include <U8g2lib.h>
#include <SPI.h>

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());
        }
    }

}

到了這里，關(guān)于ESP32 直接使用WIFI進(jìn)行UDP通信, 將光敏電阻傳感器數(shù)值, 顯示在OLED上 - 米思齊/Arduino的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！