Random crash ESP286 WEMOS D1 DHT 22 server

[hymby]

Random crash ESP286 WEMOS D1

a couple of hours Tested result: crash Wemos D1
what causes this?

///////////////////////////////////////////////////////////////////////////
Arduino side

# include <Ethernet.h>
# include <SPI.h>

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xE1};///////////!!
IPAddress ip(192, 168, 1, 175);
IPAddress gateway(192, 168, 1, 254);
IPAddress subnet(255, 255, 255, 0);
EthernetClient client;

IPAddress server(192, 168, 1, 11); ////////////////// WEMOS D1 Side

long mintavetelIdeje = 0;
const long mintavetelSzunet = 5000;

void setup() {
  Serial.begin(9600);
  Serial.println("start");
  Ethernet.begin(mac, ip);
  delay(1000);
}

String request(char what) {
  String value = "";
  if (client.connect(server, 85)) {
    client.println(what);
    delay(500);
    while (client.available()) {
      char c = client.read();
      value.concat(c);
    delay(200);
  }
    client.stop();
  }
  return value;
}

void loop() {
  if (millis() - mintavetelIdeje > mintavetelSzunet) {
    mintavetelIdeje = millis();
    String temp = request('h');
    String hum = request('l');
    String pinState = request('p');
    Serial.println(temp + "\n" + hum + "\n" + pinState + "\n");

 }
}

//////////////////////////////////////////////////////////////////////////////////////////////

WEMOS D1 R2 side

# include <ESP8266WiFi.h>

WiFiServer server(85);////////////////////////////Arduino  Side!!
# include "DHT.h"   // dht  1.1.1   !!!!!
# define DHTPIN D2
# define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

const char\* ssid = ".......";
const char\* password = "........";

String temp;
float humidity_h;
float temp_c;
String value ;
unsigned long dht_read_time = 0;
unsigned long dht_read_time_when = 5000;
int ledState = LOW;
unsigned long previousMillis = 0;
unsigned long interval = 100;
const int led = D6;
long kul;
String data;
String pinState(int pin) {
  pinMode(pin, INPUT);
  pinMode(pin, HIGH);
  switch (digitalRead(pin)) {
    case 0: return "LOW";
    case 1: return "HIGH";
  }
}

void Strobe() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;
    digitalWrite(led, ledState);
  }
}

void setup(void) {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  dht.begin();
  Serial.println("");
  pinMode ( led, OUTPUT );
  digitalWrite ( led, 0 );

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void dht_read() {
  if (millis() - dht_read_time > dht_read_time_when) {
    dht_read_time = millis();
    temp_c = dht.readTemperature();
    humidity_h = dht.readHumidity();
  }
}

void accept_request() {
  WiFiClient client = server.available();
  if (!client) {
    return;
  }
  Serial.println("new client");
  while (!client.available()) {
    delay(1);
  }
  char c = client.read();
  switch (c) {
    case 'h':
      value = String(temp_c, 1);
      delay(100);
      break;
    case 'l':
      value = String(humidity_h, 1);
      delay(100);
      break;
    case 'p':
      value = pinState(D7);
      delay(100);
      break;
    default:
      value = "";
      delay(100);
      break;
  }
  if (!value.equals("")) {
    client.print(value);
    delay(1);
    Serial.print(c);
    Serial.println(": " + value);
  }
  delay(1);
  Serial.println("Client disonnected");
}

void loop(void) {
  dht_read();
  accept_request();
  Strobe();

  if (millis() - kul > 1000) {
    kul = millis();
    Serial.print("Free heap:");
    Serial.println(ESP.getFreeHeap(), DEC);
  }
}

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[hallard]

@hymby
I didn't checked your code, but I also had random crashes on 75% of my nodes last week. At first I thought it was in my code but it wasn't, here what I did and now it works fine for 5 days without any crash and reset. I don't know wich one did the trick but doing all of this will not hurt.

• check power quality and/or USB cable (by changing them to test), triple check this one my major problems came from this point.
• Put a big caps between 3V3 and GND (1000uF 10V) to increase resistance on power fluctuations and FCC
• Set flash speed to 40MHz (it's okay if you selected Wemos boards on IDE)
• I keeped CPU to 160MHz (for information)
• Switch flash mode on QIO/DIO (not sure with which one I've done on this)
• Avoid multiple boards and Wifi modules setup too close, if it's the case, try to set them far away from each other more than 75cm/1m is fine (in my case)

I suggest making these changes 1 by 1 to know which one solve your issue and this may help others if you succeed ;-)

As you can see below, I'm really happy, 5 days uptime with no reset at all on 5 nodes, works great ;-)

[hallard]

Oh, by the way just to say that DHT22 sensors are far from my favorites because despite the fact a measure is slow, they bit bang protocol with a IO/pin and are touching timing and IRQ and with WifI enabled and working I like letting these background task doing their stuff.
I'm using some classic I2C one without doing any fancy stuff on IRQ in my sketch ;-)
Less consumption, less "fancy IRQ", faster, smaller, cheaper, excellent precision, well love them ;-)
check this one

[hymby]

Thank you for checking

Instead of trying so DHT22

float temp () {
   return random (-200.400) /10.0;
  }
I try to Proposal
Thanks

[hymby]

The proposed've changed.
Unfortunately crash is still random.

I tried EXAMPLE ESP8266WIFI >> >>>> WifiWebServer code here within 1 hour crash. else if that is so then you can suspect a library error?

Arduino sie

#include <Ethernet.h>
#include <SPI.h>
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xE1};
IPAddress ip(192, 168, 1, 175);
IPAddress gateway(192, 168, 1, 254);
IPAddress subnet(255, 255, 255, 0);
EthernetClient client1;
String led_off;
String led_on;
String value;
EthernetServer server(100);

IPAddress server1(192, 168, 1, 11);/////////////////////////// esp8266 wemos D1

void setup() {
Serial.begin(115200);
Ethernet.begin(mac, ip);
Serial.print("start ");
delay(1000);
}

String req(String mit) {
String value = "";
if (client1.connect(server1, 80)) { ///////////////////////////////!!!!Wemos
delay(1);
client1.println(mit);
delay(1);
client1.stop();
}
delay(1);
return value;
}
void will_switch() {
delay(1000);
led_off = req("/gpio/1");
delay(1000);
led_on = req("/gpio/0");
delay(1000);
}

void loop() {
will_switch();
}

/////////////////////////////////////////////////////////////////////

ESP8266 Wemos D1 R2

Arduino 1.6.7
File>>Example>>> ESP8266WIFI >> >>>> WifiWebServer code

/*

• This sketch demonstrates how to set up a simple HTTP-like server.
• The server will set a GPIO pin depending on the request
• http://server_ip/gpio/0 will set the GPIO2 low,
• http://server_ip/gpio/1 will set the GPIO2 high
• server_ip is the IP address of the ESP8266 module, will be
• printed to Serial when the module is connected.
  */

#include <ESP8266WiFi.h>
const char* ssid = "........";
const char* password = "...........";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

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

// prepare GPIO2
pinMode(D6, OUTPUT);
digitalWrite(D6, 0);

// Connect to 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");

// Start the server
server.begin();
Serial.println("Server started");

// Print the IP address
Serial.println(WiFi.localIP());
}

void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}

// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}

// Read the first line of the request
String req = client.readStringUntil('\r');
Serial.println(req);
client.flush();

// Match the request
int val;
if (req.indexOf("/gpio/0") != -1)
val = 0;
else if (req.indexOf("/gpio/1") != -1)
val = 1;
else {
Serial.println("invalid request");
client.stop();
return;
}

// Set GPIO2 according to the request
digitalWrite(D6, val);

client.flush();

// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n\r\n\r\nGPIO is now ";
s += (val)?"high":"low";
s += "\n";

// Send the response to the client
client.print(s);
delay(1);
Serial.println("Client disonnected");

// The client will actually be disconnected
// when the function returns and 'client' object is detroyed
}

[hallard]

I don't think sample sketch are buggy, did you tried changing power supply ? Using one from standalone phone charger could be great. Also the 1000uF cap between 3V3 and GND ;)

how freq do you request the ESP web server of sample sketch from your browser/command line?

[osos]

I am also experiencing random crashes with both esp-01 and esp-12e submitting temp and humidity from DHT22.

Have tried solving using 470uF, but not enough. voltage seems stable both on battery and on usb charger with step-down converter.

The esp-12e is driving a oled i2c display as well, the esp-01 only the dht22 submitting date to a php-script on the local network.

Setup is arduino 1.6.7 and esp8266 v2.2.0.

[igrr]

DHT library (Adafruit DHT-sensor-library) disables interrupts for the
duration of read, longer than 20 microseconds. With the latest SDK such
long periods of interrupts are not supported.

On Wed, Feb 10, 2016, 19:54 osos notifications@github.com wrote:

I am also experiencing random crashes with both esp-01 and esp-12e
submitting temp and humidity from DHT22.

Have tried solving using 470uF, but not enough. voltage seems stable both
on battery and on usb charger with step-down converter.

The esp-12e is driving a oled i2c display as well, the esp-01 only the
dht22 submitting date to a php-script on the local network.

Setup is arduino 1.6.7 and esp8266 v2.2.0.

—
Reply to this email directly or view it on GitHub
#1594 (comment).

[hymby]

I do not speak English only translate.

I have tried <WiFiClient.h> The above example program.
I sent a simple request to the server and sent back to temperature.
After crashing ranging within 160 requests.

Now I use the example ESP8266Webserver AdvancedWebServer >>
  this sends an HTTP request to Arduino and it works perfectly.
(6640 Now I look for.) You can Use the library.
hymby

[osos]

@igrr are there other dht22 libraries available which does disable interrupts. I guess the time measure could be achived using exactly a change interrupt on the data pin.

[chaeplin]

@osos check
https://github.com/piettetech/PietteTech_DHT
ported to esp8266 : https://github.com/chaeplin/PietteTech_DHT-8266
I am testing timing now.

[osos]

@chaeplin very interesting thanks. Will look into it, hopefully during the weekend.

[osos]

@chaeplin my esp-12e with oled i2c display and dht22 has been running for 5 days now without any lock-up/crash using your interrupt-driven DHT22 driver. Thanks.

Will probably switch to si7021 sensors anyway.

[duncan-a]

@osos https://github.com/osos Any chance you could post your functioning
code?

I spent ages going over the examples that came with the PietteTech_DHT-8266
library and tied myself into knots trying to work out how to add a DHT to
what I had (the Adafruit DHT library was easy but doesn't work reliably on
the ESP for me - Ivan has, I think, explained why).

Thanks

On 19 February 2016 at 10:39, osos notifications@github.com wrote:

@chaeplin https://github.com/chaeplin my esp-12e with oled i2c display
and dht22 has been running for 5 days now without any lock-up/crash using
your interrupt-driven DHT22 driver. Thanks.

Will probably switch to si7021 sensors anyway.

—
Reply to this email directly or view it on GitHub
#1594 (comment).