ESP8266 Community Forum

- Wed Jan 13, 2016 11:15 am #38693 Hi,

I read analog values with my NodeMCU V1.0 and post to a Webserver on a regular base.

After approx. 5000 seconds I can see on my webserver, that the NodeMCU has rebootet.
Sometimes it happens after 100 sec, sometimes after 10000 - without any external influence.
And I have NO idea why :(

Can someone help me ?

Code: Select all
#include <ESP8266WiFi.h>

const char* ssid = "mywlan";
const char* password = "mypassword";

const char* host = "10.0.0.100";
const int httpPort = 80;

unsigned long prev_millis = 0;

int sensorValue = 0;

WiFiClient client;

void setup() {
 
  Serial.begin(115200);
  delay(10);
 
  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to WLAN   ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(200);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

// Print the IP address
  Serial.print("My IP is:  ");
  Serial.println(WiFi.localIP());
}


void loop() {

  // Establish WiFi if disconnected
 
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.println("WLAN Connection lost - try to reconnect ...");
    WiFi.begin(ssid, password);
  }

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
 

  sensorValue = analogRead(A0);
 
  Serial.println("Value: "+String(sensorValue));
  delay(50);

  if (!client.connect(host, httpPort)) {
        Serial.println("Connection failed");
        Serial.println();
        return;
      }
      else
      {
        Serial.println("verbunden ...");
      }

       String data = "";
      data = "param=Power_Tot&user=test&value=100&p1=nodemcu&p2=50&p3="+String(millis()/1000);
      Serial.println("POST1:   "+String(data));
      client.println("POST /api/values HTTP/1.1");
      client.println("Host: " + String(host));
      client.println("Content-Type: application/x-www-form-urlencoded");
      client.print("Content-Length: ");
      client.println(data.length());
      client.println();
      client.println(data);
      Serial.println("Daten übertragen");
      Serial.println();
    }