Arduino: [Problem] ets Jan 8 2013,rst cause:4, boot mode:(3,7)

[lhcavalcanti]

I tried to resolve the reseting problem with the previous issues here. But I already correct all the pins ( GPIO0 pulled up, GPIO15 pulled down, rst and ch_pc also pulled up) and the problem continues. So I checked the supply, but I'm using a lm1117 and the voltage provided its also correct.

Some issue before talked about disabling the watchdog ( ESP.wdtDisable();), I tested and the problem persists.

After the problem line appears:

wdt reset
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x42
csum 0x42
~ld

Anyone knows what can I do to fix it?

[me-no-dev]

So how do you get to trigger that problem? Please post some code that triggers it. The issue as explained could not be understood.

[lhcavalcanti]

Sorry.
I'm trying to use the WebClient example to send the temperature from my work space. So I just changed the value sent and the frequency of upload data.

The code is:

#include <ESP8266WiFi.h>

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

const char* host = "data.sparkfun.com";
const char* streamId   = "G2NoXQalpKHjJ0ZvM7GL";
const char* privateKey = "----------------------------------";

void setup() {
  Serial.begin(115200);
  delay(10);
  // We start by connecting to a WiFi network
  //ESP.wdtDisable();
  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 temp = 0;

void loop() {
  temp = analogRead(A0); // reading sensor
  temp = temp * 0.09765625; // costance (1/1024*100)


//  ++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;
  }



  // We now create a URI for the request
  String url = "/input/";
  url += streamId;
  url += "?private_key=";
  url += privateKey;
  url += "&value=";
  url += temp;

  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");
  delay(10);

  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    // Serial.print(line); // Not using this message yet 
  }
  Serial.println("time");
  delay(20000); // Just send every 20 seconds
  Serial.println("closing connection");
  Serial.println();
}

[demandajmenso]

Check this out maybe we have the same issue.
https://github.com/esp8266/Arduino/issues/1342

[demandajmenso]

Also I have added a large capacitor (470uF) across the Vcc and Gnd rails

[TwatBurglar]

OP, did you find a solution for this? wdt_disable() DOES NOT WORK, but it DOES seem to feed the watchdog. 8 seconds after wdt_disable(), watchdog will always time out.

[pratikmokashi]

having same problem
wdt reset
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x0f
csum 0x0f
~ld

[stsrc]

Be sure that your power supply is strong and stable enough. To get it working with stm32f0discovery board I had to get:

• an external voltage source (12V, 1A max),
• voltage stabilizer to 5V (radiator may be required),
• voltage stabilizer to 3V3,
• 2200uF(?!) electrolytic capacitor on 3V3, as close as possible to esp8266 power supply pin.
  This capacitor may be way to big, but I am only prototyping and want things to work.
• 100nF ceramic capacitor as close as possible to esp8266 power supply pin.

and it finally worked.

• Note about my circuit - power section was located on prototyping board, while esp8266 was connected through 20cm wires.
• Note about stabilizers - also connect to them some capacitors as their datasheets say.
• Note about big capacitor - esp8266 may work with smaller capacitor, just test it. Electrolytic capacitor should have low impedance.

[Captayne]

I have the same problem, and can't get rid of it. I am close to throw all ESP8266 away and go for another IoT system on chip.
I can't get this running stable: https://github.com/cnlohr/esp8266ws2812i2s
I use a PC power supply with 3.3V capable to drive 25A. Also added some ceramic capacitors to VCC and 3.3V directly on the pins of the Nodemcu accumulating now in up to ~3700µF.
From time to time (~~ every 20 minutes ) the chip resets with the following serial output:
_ets Jan 8 2013,rst cause:4, boot mode:(3,7)
wdt reset
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x0f
csum 0x0f
~ld_

I feel soo helpless now, because everything else works fine. Meanwhile i Have also added some other hadware and software featrues and made a new website to control pumps for a bar mixing app.
Is there anything else to debug and look deeper?
Maybe there really is a bug in the Fastled Library or any other lib used in the example?
I use Arduino 1.6.5.

Thanks for any hints.
Andreas

[krzychb]

@Captayne

Do you have issue with application from https://github.com/cnlohr/esp8266ws2812i2s or "Fastled Library" from https://github.com/FastLED/FastLED?

[Captayne]

Actually, I don't know. I just experience the crashes. If someone can give me a hint, to track down the reboots, I would be more than lucky.

Andreas/Captayne

----- Ursprüngliche Nachricht -----
Von: "Krzysztof" [email protected]
Gesendet: ‎28.‎05.‎2016 19:59
An: "esp8266/Arduino" [email protected]
Cc: "Captayne" a.[email protected]; "Mention" [email protected]
Betreff: Re: [esp8266/Arduino] [Problem] ets Jan 8 2013,rst cause:4, boot mode:(3,7) (#1328)

@Captayne

Do you have issue with application from https://github.com/cnlohr/esp8266ws2812i2s or "Fastled Library" from https://github.com/FastLED/FastLED?

---

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Reply to this email directly or view it on GitHub:
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[Captayne]

I now have changed the power supply to another PC power supply, with lots of amps on 3.3V. But reboots still occur occassionally. Always this shows up in the usb serial monitor:
_ets Jan 8 2013,rst cause:4, boot mode:(3,7)
wdt reset
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x0f
csum 0x0f
~ld_
What does room 16 mean?
The websocket error event results in #1006. (quite clear.)

Of cause I can reconnect easily from JScript, but this in not a honest solution.

Any idea? Can the code be buggy, resulting in such an error? If the code is buggy, then the beaviour should be little more deterministic and not with crashes from time to time. Website and ESP do communicate in 10Hz frequency. all works fine without any overlap until the ESP crashes.
I have swapped the NodeMCU Devboard with 5 others without any change. I put it from my PCB design back into the protoyping board with no change in behaviour.
Has somebody similiar problems?
Is there a possiblity to ad more detailed output on what the system crashes? Memory leak/ Nullpointer assignement/ memory read error / invalid instruction/ page error (I think rather not, as there is no paging).... ?
uh!?
Any hints?
Thank you soo much.

[krzychb]

@Captayne,

1. If not done already, you may check recommendations here
2. To verify if watchdog timer resets may be caused by your application, I would load one of example sketches that is using WiFi, e.g. WiFiWebServer.ino and leave it running for couple of hours.

Krzysztof

[akashdeep3194]

I was facing this problem and it was fixed by changing Tools>Upload Speed to 115200.
And Flash Size to 4M(3M SPIFFS).

[hadipic]

eset ets Jan 8 2013,rst cause:4, boot
eset ets Jan 8 2013,rst cause:2, boot

add this code slove problem all reset
ets_intr_lock(15); // all intruptt off
ets_wdt_disable();

[jumpjack]

I have same issue.
How can I specifically add ESP-07 to boards available on Arduino IDE?

[jumpjack]

I'm using this setup:

http://ediy.com.my/blog/item/133-upload-sketch-to-the-esp8266-esp-07-esp-12-using-arduino-ide

[lagunacomputer]

was able to fix this by changing the Digital Pin Assignment of my onewire device to D4, and my DHT sensor pin assignment to D6. it did not like the previous pin assignments. nodemcu v1.0

[RubenVot]

I had same problem and same message. I was trying to set the D8 to INPUT.
Changed to 0, everything ok now :)

[cesarcardinali]

Guyyyyyyys! Problem solved!
Connect an external power source to Arduino and it should work just fine!
I plugged an 9v 1A and at same moment it came to work!

[isaiasmoioso]

@cesarcardinali I"m not sure i follow. Did you mean you plugged in an external power source to your esp8266 to get it to work?

[RubenVot]

Sometimes cheap power sources can make that arduino behaves in an erratic mode.

[cesarcardinali]

@isaiasmoioso Exactly! Buy an external power source capable of 1000mA and it should work just fine.
I am using it connected to my Arduino and an external power source. Problem solved.

[macmeck]

I was having the same issue while my power supply was just fine. Solved it by using a different USB to Serial adapter. FTDI adapters brought up this issue (while also making trouble during programming from time to time) whereas I had no issues using a CP2102 adapter. You might want to give this a try...

[gojimmypi]

fwiw - I found this thread while searching for the cause of my continual ESP8266 reboots - the "rst cause:2, boot mode:(3,7)" messages out the serial port at 74880 baud - followed by repeated diagnostics, only to repeat.

My issue, is that I believe my programming method was forcing in corrupted code into the ESP8266.

The solution for me? Hold down the "Flash button" while programming. Previously I had been using VisualMicro to program the NodeMCU via the UART. (the UART handles the flash control automagically) I knew I had a good device, as I could successfully program it via the UART. However I wanted to use a JTAG debugger such as the Segger or Olimex with VisualGDB - but could never get it to work with the NodeMCU. (I spent a ridiculous amount of time before I found this solution).

While googling, I came across this: https://nodemcu.readthedocs.io/en/master/en/flash/#putting-device-into-flash-mode I had never needed to press the flash button, as the USB connection would do that for me automatically. But with JTAG I no longer had this luxury! Note that the flash button needs to be held down before power is applied to the ESP8266.

Hopefully this will help someone else & save you a few hours...

[lagunacomputer]

lol 74880, what was that like the insta-obsolete V.32fast? lol anyway i gotta tell you, i have bought about 10 nodemcu's from ebay, and it seems half were 'legit' and the other half we cheap knockoffs that did not do so well in the 'serial communication' and overall 'works great' departments. Some would work fine with the arduino 1.6x IDE and a standard stupid usb cable, others would just fight me to load a firmware. I think the cheapie chinese knock offs are a problem. The only way i could visually disingush between the two, the 'print' on the big ESP8266 chip on the fake NodeMCU's from ebay was visually rough and 'falling off'. Check yours, do you have the same cheap paint on your ESP8266 chip on your NodeMCU?

[lagunacomputer]

and YES YOU MUST SUPPLY EXTERNAL POWER if you want to run anything other than a LED off of the pins of a NodeMCU

[Captayne]

Guys, after almost a year of doing nothing on my project, which came from little demotivation, and speculating about errorfixing in the IDE and libraries by others, ...
... NOW really time seems to have worked for me.
I upgraded from Arduino 1.6.5 to 1.8.1 and compilied and flashed again. Everything in the Dev-Environment and libraries were upgraded.
AND ....

Tadaaa! No reboots occour anymore!

WebSocket connection remains stable, and the ESP runns like hell for the first hours .
Yiiippiii!

[Captayne]

It crashed again, with "ets Jan 8 2013,rst cause:4, boot mode:(3,7)" .... not after days but after 5 hours. .... but after another 5h it still runs. .... The error is not resolved. what can it be?

[aminbehravan]

i tested, just change flash size, it will be fixed. it was really complicated

[Captayne]

Change flash size? Please give little more advice. Thank you.
Captayne.

[aminbehravan]

if you are using the esp-12 as i used, just go to "tools" and then "flash size" and choose one of them.
"4M (1M spiffs) worked for me.

[Captayne]

The adjustment to "4M (1M spiffs)" worked for me too! Thank you AminBehravan!
I was so badly debugging my stuff, ... but sometimes the solution is soo simple but on a far planet at the same time.
Now it works and my project can go on. My trust in ESP is back.
(btw. can't the spiffs whatever seettings can't be detected and set automatically?)

Best Andreas

[gojimmypi]

fwiw - while working on my "build esp8266" script:

https://github.com/gojimmypi/build_esp8266

I discovered the most recent version of esptool.py here:

https://github.com/themadinventor/esptool/

no longer requires explicit flash size, as it auto-detects it! :)

[pipoblak]

Im getting this error after a while using FASTLEDS in my nodemcu. Anyone knows how to resolve this?

the code:
https://gist.github.com/pipoblak/344c8b93625dff744fd296a73a78da38
the stack trace:

Connecting to QG BOLADAO
......
WiFi connected
IP address: 
192.168.1.76
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
chg_B1:-40
chg_B2:0
mac 981

 ets Jan  8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16 
tail 8
chksum 0x2d
csum 0x2d
v09f0c112
~ld
þ

[gojimmypi]

are you petting the watchdog? yield() will usually help, I think delay() also yields.

see https://github.com/esp8266/Arduino/issues/2942

[pipoblak]

I put the yield() in frequently used functions and don't work too :(

[pipoblak]

I tryed a more simple code with FastLeds and NodeMCU and dont work too.

Code: https://gist.github.com/pipoblak/9e164e86242728e14f72500d2de9eeb4

StackTrace:

dev 1143

 ets Jan  8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16 
tail 8
chksum 0x2d
csum 0x2d
v09f0c112
~ld
á

[scotthibbs]

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v09f0c112
~ld

I solved this error loop because I had

define DOOR_PIN 6

instead of

define DOOR_PIN 4

So check which pins are assigned.
Hope this helps,
Scott

[NarreKiwi]

This problem entirely goes away, after completely erasing the external SPI FLASH chip. Most likely it got corrupted somehow along the way from the previous FLASH upload to the chip, since it triggers the WDT reset and keeps rebooting all the time, after you pressed the reset button on the ESP12-E which I've got.
You need to use a short Arduino IDE sketch to do it - see https://github.com/kentaylor/EraseEsp8266Flash
Then I used the NodeMCU Flasher to upload a normal program *.bin file to it, to run a normal serial comms program from it which I checked the comms through the Arduino IDE serial monitor. Everything runs fine after that!

[shitalshivani]

Hi everyone!!
i have ESP12-E,i am using this for IOT application.I have done with my code.Now i am testing this code on esp8266 12E node MCU board.and i am getting random error of exception 0 and
ets Jan 8 2013,rst cause:2, boot mode:(3,7) wdt reset after 24 hours and sometimes it occurs after few hours.
I am not getting whats wrong with my code.please suggest any solution.thanks in advance.

[NarreKiwi]

Most likely fault caused by programming corruption after you FLASHed it. Try reprogramming it with an original factory .bin file.

Sent from my Android phone with mail.com Mail. Please excuse my brevity.

[raufjay]

I had the same issue which is resolved now.

dt reset
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x42
csum 0x42
~ld

Just resolved it with a strange solution.

I was using example of basicOTA with a minor addition of blink. In the loop I had a condition to check pin D8, if LOW go to the OTA handler so it will wait to receive sketch OverTheAir. If D8 is HIGH then continue blinking LED.

After uploading the code via com port, the esp8266 or nodemcu should blink the led unless i pull down the D8. But I kept getting the above error.

I tried using D7 and D3 as well, with the same result.

I was using "#define BUTTON 8" statement.

But when I used "#define BUTTON D8" instead, all issues gone, and esp8266 started working normally.

Strangely, the pin D2 which is used for the built-in LED is still flashing ON and OFF without using letter D. I can still use digitalWrite(2,HIGH) or LOW. That means there is some inherent problem with the IDE porting code which behaves different for the INPUT and OUTPUT modes.

Can some one explain it to me?

Hope it may help someone.

Thanks,

Rauf

[Tvde1]

I'm getting this issue without having touched the board before.

I bought an ESP8266 and connected to it with the serial monitor and got this. I've tried flashing the basic Blink demo but that isn't fixing anything. I've played around with all the settings.

Any help?

[lagunacomputer]

Try flashing a blank sketch

Sent from my iPhone

On May 14, 2018, at 12:13 PM, Tim van den Essen [e-mail] wrote:

I'm getting this issue without having touched the board before.

I bought an ESP8266 and connected to it with the serial monitor and got this. I've tried flashing the basic Blink demo but that isn't fixing anything. I've played around with all the settings.

Any help?

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[man6663]

resolve it by change to external power supply....usb port not enough amp

[kopolindo]

@akashdeep3194 GOD BLESS YOU. I owe you a beer

[daekonn]

I solved...

by inserting

ESP.wdtDisable();

inside the problem making function , not in the setup(). ^^

[devyte]

@daekonn which function?

[ivm164]

I've got resets when trying to use quite large local array. In my case it was bool a[150][150]. IDE doesn't produce any warning during compilation in this case. When I made that array global I've got the warning on possible instability due to low memory but in the end there were no real problems and at least I know now what I should optimize to make things better.

[dehuy69]

Try:
In Arduino IDE Tools >> Erase Flash >> All flash content
recompile and upload

[frustrat01]

Having some issues with the ESP8266-01 by uploading the sensor data to the localhost.

The below shows the issues when I open the Serial Monitor in the Arduino

` ets Jan 8 2013,rst cause:4, boot mode:(1,0)

wdt reset
`
By the way, I have tried using the WiFiClient example to upload the dummy data to the localhost and it works. But it cannot work with uploading the sensor to the localhost.
Anyone has solution please help me to get rid of this issue ASAP

[lagunacomputer]

Try changing your code to use a different gpio pin

Sent from my iPhone

On Dec 8, 2018, at 8:54 AM, frustrat01 [e-mail] wrote:

Having some issues with the ESP8266-01 by uploading the sensor data to the localhost.

The below shows the issues when I open the Serial Monitor in the Arduino
` ets Jan 8 2013,rst cause:4, boot mode:(1,0)

wdt reset
`
By the way, I have tried using the WiFiClient example to upload the dummy data to the localhost and it works. But it cannot work with uploading the sensor to the localhost.
Please help me to get rid of this issue ASAP

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[frustrat01]

@lagunacomputer Can you give the example for this because I still new to this Arduino and ESP8266-01.

[lagunacomputer]

Pretty sure esp8266 only has 2 gpio pins, looks like you are trying to use more than actually available, I bet the code works on a Uno or a mega because they support more pins

“#define in 7

define out 8define #trigPin 10 #define echoPin 13 #define relay 2 #define led 6 //red color #define led2 A0 //yellow color #define led3 9”

Sent from my iPhone

On Dec 8, 2018, at 10:12 AM, frustrat01 [e-mail] wrote:

@lagunacomputerI don't understand what you mean. Can you give the example for this because I still new to this Arduino and ESP8266-01.

the below text file is my Arduino source code for this
ESP8266_upload.txt

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[KiLLAAA]

Hello everyone, the wdt reset is caused by entering infinite loop!

Entering infinite loop(while) will trigger reset in a second, the reason is that the loop is blocking and esp8266 needs to keep WiFi connected and lots of other background things running.
Solution recommended by @daekonn ESP.wdtDisable(); only disables software watchdog, the hardware one will trigger in ~6seconds, resulting in -> rst cause:4
Solution is to FEED the watchdog!
Solution no.1: ESP.wdtFeed(); // feeds the dog
Solution no.2: system_soft_wdt_feed(); // same as no.1
Solution no.3: yield(); // implemented in esp8266 libraries
Solution no.4: delay(1); // yeah, really

example:
while(1) {ESP.wdtFeed();};

[devimeruva]

17:34:15.107 ->
17:34:15.107 -> ets Jan 8 2013,rst cause:4, boot mode:(1,6)
17:34:15.107 ->
17:34:15.107 -> wdt reset

this is being displayed on my COM port instead of showing IP Address. How can i resolve this issue?

[lagunacomputer]

Change to a different pin, use different PIN numbers in your code

Sent from my iPhone

On Jan 22, 2019, at 4:15 AM, devimeruva [e-mail] wrote:

17:34:15.107 ->
17:34:15.107 -> ets Jan 8 2013,rst cause:4, boot mode:(1,6)
17:34:15.107 ->
17:34:15.107 -> wdt reset

this is being displayed on my COM port instead of showing IP Address. How can i resolve this issue?

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Reply to this email directly, view it on GitHub, or mute the thread.

[lrmoreno007]

It's documented
https://arduino-esp8266.readthedocs.io/en/latest/faq/a02-my-esp-crashes.html#watchdog

If you don't solve your problem read and follow this:
https://arduino-esp8266.readthedocs.io/en/latest/faq/a02-my-esp-crashes.html#if-at-the-wall-enter-an-issue-report

[KiLLAAA]

@devimeruva post code?

[devimeruva]

include

include

include

EnergyMonitor emon1; // Create an instance
LiquidCrystal lcd(12,11,5,4,3,2);

const char* ssid = "Zunik Energies Pvt Ltd";
const char* password = "zunik1234";
WiFiServer server(80);

void setup() {
Serial.begin(9600);
Serial.setDebugOutput(true);
lcd.begin(20,4);
emon1.voltage(2,2313.26,1.7);
emon1.current(1,58.1);
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.write(13);
server.begin();
Serial.println(WiFi.localIP());
}

void loop() {
WiFiClient client = server.available();
if (!client) {
return;
}
Serial.println("new client");
while(!client.available())
{
delay(1);
}
emon1.calcVI(20,2000);
emon1.serialprint();
unsigned int long timemillis = millis();
unsigned int long time = millis();
float realPower = emon1.realPower;
float apparentPower = emon1.apparentPower;
float supplyVoltage = emon1.Vrms;
float Irms = emon1.Irms;
float powerFactor = (realPower/ apparentPower);
lcd.setCursor(4,0);
lcd.print ("EnergyMonitor");
lcd.setCursor(0,1);
lcd.print("V = ");
lcd.print (supplyVoltage);
lcd.setCursor(9,1);
lcd.print("I = ");
lcd.print(Irms);
lcd.setCursor(0,2);
lcd.print("Powerfactor = ");
lcd.print(powerFactor);
lcd.setCursor(0,3);
lcd.print("Units(kWh) = ");
lcd.print(abs(realPowertime)/abs(10003600));
String web = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
web += "\r\n";
web += "\r\n";
web += "

ENERGY MONITOR

\r\n";
web += "

\r\n";
web += "V=\r\n";
web += Serial.print(supplyVoltage);
web += "I=\r\n";
web += Serial.print(Irms);
web += "Powerfactor =\r\n";
web += Serial.print(powerFactor);
web += "Units(kWh) = \r\n";
web += Serial.print((realPowertime)/abs(10003600));

web += "\r\n";
web += "\r\n";

client.print(web);
}

On Thu, Jan 24, 2019 at 5:38 PM KiLLAAA [e-mail] wrote:

@devimeruva https://github.com/devimeruva post code?

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[devimeruva]

include

include

include

EnergyMonitor emon1; // Create an instance
LiquidCrystal lcd(12,11,5,4,3,2);

const char* ssid = "Zunik Energies Pvt Ltd";
const char* password = "zunik1234";
WiFiServer server(80);

void setup() {
Serial.begin(9600);
Serial.setDebugOutput(true);
lcd.begin(20,4);
emon1.voltage(2,2313.26,1.7);
emon1.current(1,58.1);
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.write(13);
server.begin();
Serial.println(WiFi.localIP());
}

void loop() {
WiFiClient client = server.available();
if (!client) {
return;
}
Serial.println("new client");
while(!client.available())
{
delay(1);
}
emon1.calcVI(20,2000);
emon1.serialprint();
unsigned int long timemillis = millis();
unsigned int long time = millis();
float realPower = emon1.realPower;
float apparentPower = emon1.apparentPower;
float supplyVoltage = emon1.Vrms;
float Irms = emon1.Irms;
float powerFactor = (realPower/ apparentPower);
lcd.setCursor(4,0);
lcd.print ("EnergyMonitor");
lcd.setCursor(0,1);
lcd.print("V = ");
lcd.print (supplyVoltage);
lcd.setCursor(9,1);
lcd.print("I = ");
lcd.print(Irms);
lcd.setCursor(0,2);
lcd.print("Powerfactor = ");
lcd.print(powerFactor);
lcd.setCursor(0,3);
lcd.print("Units(kWh) = ");
lcd.print(abs(realPowertime)/abs(10003600));
String web = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
web += "\r\n";
web += "\r\n";
web += "

ENERGY MONITOR

\r\n";
web += "

\r\n";
web += "V=\r\n";
web += Serial.print(supplyVoltage);
web += "I=\r\n";
web += Serial.print(Irms);
web += "Powerfactor =\r\n";
web += Serial.print(powerFactor);
web += "Units(kWh) = \r\n";
web += Serial.print((realPowertime)/abs(10003600));

web += "\r\n";
web += "\r\n";

client.print(web);
}

[lrmoreno007]

The problem are in the the Third Party library EmonLib ---> https://github.com/openenergymonitor/EmonLib/blob/master/EmonLib.cpp

It's not fixed for ESP8266. There are a while(1) and if you read the docs and what was discussed in this issue, then you must know what to do.

[KiLLAAA]

@devimeruva the problem is that you need to use proper (ported) library for esp8266..
also.. the sketch seems that it will not likely do what you would expect..
library here..
inspiration there..

[DamienAR]

Hi ! I don't know if someone will see my message but, I had the same error and I think I found my problem.
I work on an ESP8266 NodeMCU DevKit V1 and I noticed, when I want tu use the function millis(), my ESP reset.

[ngonhatduy]

Try:
In Arduino IDE Tools >> Erase Flash >> All flash content
recompile and upload

Thanks you so much for your help!!

[rashey04ec]

I have solved it !!,
Please try to comment all pin you used in programming and it's related function )like pinMode , digitalWrite etc.

• Again save and upload it
  
  
  
  • check the serial monitor
  
  
  • if you not getting error that means this is because of pin declaration
  
  
  • to solve this issue : dont use #define declaration for initialize pin.
    
    -Direct use pin in pinMode definition and read /write function
  
  
  • Use GPIO no in if you are doing it in ARDUINO IDE
  
  

May be helpfull

Thanks :
Jaydeep Shah
E-mail : [email protected]

[pkarun]

I have this issue:

I assigned all Nodemcu pins with D5, D6 etc.. like that in code but for one pin I assigned 1 (GPIO1, for nodemcu TX pin). I changed that Pin to D3 and program started working fine for me.

[paulodrugos]

Thanks @rashey04ec !! The trick was to use GPIO number, like in this image: https://alselectro.files.wordpress.com/2017/10/nodemcu_pins1_thumb.jpg?w=517&h=441
I'm using the D6 pin, but in arduino IDE I should declare as pin 12

[javimata]

i solved change it the pin, i was 7 and 8 and change it to 2 and 4 and word fine

[golden-dino]

I solved the restarting problem by attaching a big 2200uF capacitor close to the ESP Module, I think the cheap power supplies don't have a fast transient response to sudden peaks, certain functions require a high peak current for a very short time. In my case, I was using this cheap power supply module I bought from Aliexpress which I think was the culprit I compensated for the problem by using a big cap.

Below is the error code that was repeating again and again after each restart.

ets Jan 8 2013,rst cause:4, boot mode:(3,4)
wdt reset
load 0x40100000, len 2592, room 16
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run user1 @ 1000

correct flash map
œbd[02];ûg[0F]lph„ã[03]ì[13]ƒgäÛsƒò'|ì[0C]„lÇxsd[1C]c“[1B][03][0C]Ÿ<[03]s›[03]dœgà[0C]‚'ã[00][0C]d[02]Äãr›$Œd[13]Œ[04][0C][04]$[03]ŒãsÛlä$[1B]„[0C][0C][04]l [03]Œã{“l[04]‡Ÿ[00]Ä[0C][04]ll[03]{l‚{lŒŸâ„c[04]ì„cŒb‡#|“ì„ì“c[12]#äònç€[13]ngã[10][03][0C][03]ldàã[02]„Ä[0C]„[0C]Œ[04][0C]dć[1F]ŒŒÇ[1F]€[0C]Ž[07]lÀ[03]oü[00]„ŸãŒc[0C]dll‡[1B][04]c[04][03][03]„ŸãŒc[0C]d[0C]Œb[1C]{lsd
ready

[bramvreugd]

I solved it by specifying a different flash size.

[tecPhoenix]

Hello everyone, the wdt reset is caused by entering infinite loop!

Entering infinite loop(while) _will_ trigger reset in a second, the reason is that the loop is blocking and esp8266 needs to keep WiFi connected and lots of other background things running.
Solution recommended by @daekonn ESP.wdtDisable(); only disables software watchdog, the hardware one will trigger in ~6seconds, resulting in -> rst cause:4
Solution is to FEED the watchdog!
Solution no.1: ESP.wdtFeed(); // feeds the dog
Solution no.2: system_soft_wdt_feed(); // same as no.1
Solution no.3: yield(); // implemented in esp8266 libraries
Solution no.4: delay(1); // yeah, really

example:
while(1) {ESP.wdtFeed();};

Damn, delay(1) in void loop does the trick.
Without it, it will crash after about 5min to 2h.

Thank you sir!