Arduino通过服务器开启/关闭LED指示灯

我对Arduino/ESP8266很陌生。我想制作一个简单的程序，通过HTTP请求打开和关闭内置LED。 HTTP请求工作正常，JSON反序列化也是如此。我到达需要的if分支（取决于GET请求响应），但LED不响应。问题在于LED不断打开。我错过重要的东西吗？我试图通过互联网搜索，但我没有找到我需要的。Arduino通过服务器开启/关闭LED指示灯

ESP8266，NodeMCU 0.9

#include <ArduinoJson.h> 
#include <ESP8266WiFi.h> 

const char* ssid  = "SSID"; 
const char* password = "password"; 

const char* host = "host.com"; 
const char* streamId = "...................."; 
const char* privateKey = "...................."; 
StaticJsonBuffer<200> jsonBuffer; 

void setup() 
{ 
    Serial.begin(115200); 
    delay(10); 

    // Initialize LED, setting it to off 
    pinMode(LED_BUILTIN, OUTPUT); 
    digitalWrite(LED_BUILTIN, LOW); 

    // We start by connecting to a WiFi network 

    Serial.println(); 
    Serial.println(); 
    Serial.print("Connecting to "); 
    Serial.println(ssid); 

    WiFi.begin(ssid, password); 

    while (WiFi.status() != WL_CONNECTED) { 
     delay(500); 
     Serial.print("."); 
    } 

    Serial.println(""); 
    Serial.println("WiFi connected"); 
    Serial.println("IP address: "); 
    Serial.println(WiFi.localIP()); 
} 

int value = 0; 

void loop() 
{ 
    delay(2); 
    ++value; 

    Serial.print("connecting to "); 
    Serial.println(host); 

    // Use WiFiClient class to create TCP connections 
    WiFiClient client; 
    const int httpPort = 80; 
    if (!client.connect(host, httpPort)) { 
     Serial.println("connection failed"); 
     return; 
    } 

    String url = "/hrnem-brnem-api/index.php/entries/127"; 

    Serial.print("Requesting URL: "); 
    Serial.println(url); 

    // This will send the request to the server 
    client.print(String("GET ") + url + " HTTP/1.1\r\n" + 
       "Host: " + host + "\r\n" + 
       "Connection: close\r\n\r\n"); 
    unsigned long timeout = millis(); 
    while (client.available() == 0) { 
     if (millis() - timeout > 5000) { 
      Serial.println(">>> Client Timeout !"); 
      client.stop(); 
      return; 
     } 
    } 

    String line; 
    // Read all the lines of the reply from server and print them to Serial 
    while (client.available()) { 
     line = client.readStringUntil('\r'); 
     Serial.print(line); 
    } 

    JsonObject& root = jsonBuffer.parseObject(line); 

    int value = root["value"]; 

    Serial.print(value); 
    if (value == 1) { 
     // turn LED on: 
     Serial.print("LED is ON."); 
     digitalWrite(LED_BUILTIN, HIGH); 
    } 
    else { 
     // turn LED off: 
     Serial.print("LED is OFF."); 
     digitalWrite(LED_BUILTIN, LOW); 
    } 

    Serial.println(); 
    Serial.println("closing connection"); 
}

来源

2016-11-06 user3420869

所以我只想澄清，你看到这两条消息 - “LED点亮”和“灯不亮”，在串行监控打印，根据检索到的JSON响应？ – enhzflep

所以哟确实需要投下您收集JSON属性使其富有意义和可比性。

使用此：

int value = root["value"].as<int>();

来源

2016-11-08 08:19:48 cagdas

Arduino通过服务器开启/关闭LED指示灯

回答

相关问题