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Description
Basic Infos
Hardware
Hardware: ESP-12E
Core Version: 2.3.0
Description
I tried to make a simple webserver for displaying DHT22 data using the Adafruit DHT library but I'm having some strange behavior and crashes. After a certain amount of requests, the esp8266 board just hangs outputting that stack trace through the serial port. I searched the web for it and I found that time ago someone opened an issue similar to this one I have but the fix should have already been merged from the release 2.3.0-rc1.
I have even tried to put WiFi.persistent(false); or changing the library version till 2.1.0 with no success.
Settings in IDE
Module: NodeMCU 1.0 (ESP-12-E)
Flash Size: 4MB
CPU Frequency: 80MHz
Upload Using: Arduino IDE
Sketch
/* DHTServer - ESP8266 Webserver with a DHT sensor as an input
Based on ESP8266Webserver, DHTexample, and BlinkWithoutDelay (thank you)
Version 1.0 5/3/2014 Version 1.0 Mike Barela for Adafruit Industries
*/
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <DHT.h>
#define DHTTYPE DHT22
#define DHTPIN 5
#define red 4
const char* ssid = "XXXXXXX";
const char* password = "XXXXXXXXXX";
ESP8266WebServer server(3004);
// Initialize DHT sensor
// NOTE: For working with a faster than ATmega328p 16 MHz Arduino chip, like an ESP8266,
// you need to increase the threshold for cycle counts considered a 1 or 0.
// You can do this by passing a 3rd parameter for this threshold. It's a bit
// of fiddling to find the right value, but in general the faster the CPU the
// higher the value. The default for a 16mhz AVR is a value of 6. For an
// Arduino Due that runs at 84mhz a value of 30 works.
// This is for the ESP8266 processor on ESP-01
DHT dht(DHTPIN, DHTTYPE, 26); // 11 works fine for ESP8266-01
float humidity, temp_f; // Values read from sensor
// Generally, you should use "unsigned long" for variables that hold time
unsigned long previousMillis = 0; // will store last temp was read
const long interval = 2000; // interval at which to read sensor
void handle_root() {
getWeather();
server.send(200, "application/json", "{\"temperature\": \"" + String(temp_f) + "\", " + "\"humidity\": \"" + String(humidity) + "\"}");
delay(2000);
}
void setup(void)
{
// You can open the Arduino IDE Serial Monitor window to see what the code is doing
Serial.begin(115200);
dht.begin(); // initialize temperature sensor
//Initialize static IP for server purposes
IPAddress ip(192, 168, 1, 153);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
WiFi.config(ip, gateway, subnet);
Serial.print("Setting static IP to: ");
Serial.println(ip);
// Connect to WiFi network
WiFi.begin(ssid, password);
Serial.print("\n\r \n\rWorking to connect");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
digitalWrite(red, HIGH);
delay(250);
Serial.print(".");
digitalWrite(red, LOW);
delay(250);
}
Serial.println("");
Serial.println("DHT Weather Reading Server");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
WiFi.persistent(false); //workaround to buffer overflow of the wifi lib
// Routers expressjs alike
/*
server.on("/", []() {
server.send(200, "text/plain", "Welcome to the esp8266 website! Please request \"/get_weather\"");
}); */
server.on("/get_weather", handle_root);
server.begin();
Serial.println("HTTP server started");
}
void loop(void)
{
server.handleClient();
}
void getWeather() {
// Wait at least 2 seconds seconds between measurements.
// if the difference between the current time and last time you read
// the sensor is bigger than the interval you set, read the sensor
// Works better than delay for things happening elsewhere also
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time you read the sensor
previousMillis = currentMillis;
// Reading temperature for humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
humidity = dht.readHumidity(); // Read humidity (percent)
temp_f = dht.readTemperature(false); // Read temperature as Fahrenheit
// Check if any reads failed and exit early (to try again).
if (isnan(humidity) || isnan(temp_f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
}
}
Debug Messages
Exception (3):
epc1=0x4000bf64 epc2=0x00000000 epc3=0x00000000 excvaddr=0x40056fcb depc=0x00000000
ctx: cont
sp: 3ffefee0 end: 3fff01e0 offset: 01a0
>>>stack>>>
3fff0080: 41c4cccd 41c4cccd 00000000 00000000
3fff0090: 40056fcb 44000000 00000001 40203c80
3fff00a0: 00000001 3ffee798 3ffef180 4020587d
3fff00b0: 00000010 00000001 3fff153c 40202383
3fff00c0: 00000010 3fff0120 3fff0120 40205aac
3fff00d0: 3fff1d2c 0000000c 3fff0120 40205afb
3fff00e0: 3ffef160 0000018a 0000018a 4010020c
3fff00f0: 00000001 00000001 3fff153c 4020642a
3fff0100: 00000000 3fffdad0 3fff153c 40203c76
3fff0110: 3fff153c 3ffee7f0 3fff153c 40203cb2
3fff0120: 00000000 00000000 00000000 40205c5c
3fff0130: 3fff153c 3ffee7f0 3ffee7b0 40203d45
3fff0140: 3fff1d2c 0000000f 0000000c 40202ccc
3fff0150: 3ffee7f0 3ffee7b0 3ffef1c0 00000001
3fff0160: 00000001 40203288 0000000f 3ffef1c0
3fff0170: 00000000 00000000 3ffee7b0 3ffef1ac
3fff0180: 00000001 3ffee7d4 3ffee7b0 40203f27
3fff0190: 3ffe8550 00000000 000003e8 0101a8c0
3fff01a0: 00000000 3fff19f4 feefeffe feefeffe
3fff01b0: 3fffdad0 00000000 3ffef1a4 402022cc
3fff01c0: 3fffdad0 00000000 3ffef1a4 40206258
3fff01d0: feefeffe feefeffe 3ffef1c0 40100718
<<<stack<<<
ets Jan 8 2013,rst cause:2, boot mode:(1,6)
ets Jan 8 2013,rst cause:4, boot mode:(1,6)
wdt reset
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