Hello guys,
I have a problem with the Blynk which is used on Wemos d1 R2 v2.1 board.
I have made a watering system with Blynk for two months .
My watering system has two relays , one DHT22 sensor and one push button to activate watering manually. It will run watering at my setting time and it worked fine until last week.
Recently , I found that the blynk app status often goes online for few minutes ,then goes offline for few seconds.
I used to think there is some problem with the hardware, but after changing the hardware, the problem isn’t solved.
Here is my code , thank you for your help.
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SPI.h>
#include <DHT.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "my token";
#define DHTPIN 12 // What digital pin we're connected to
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21 // DHT 21, AM2301
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;
//relay
const byte relay = 13; //relay pin
const byte relay_2 =15 ; //repay_2 pin
const byte button = 14;
//button
int buttonvalue;
//manully watering time(minute)
int delayminute=1;
int delaysecond;
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "XXXXX";
char pass[] = "XXXXX";
void setup()
{
// Debug console
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
// You can also specify server:
//Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 80);
//Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
// Setup a function to be called every second
timer.setInterval(60000L, sendSensor);
pinMode(relay,OUTPUT);
pinMode(relay_2,OUTPUT);
pinMode(button, INPUT);
dht.begin();
}
void loop()
{
Blynk.run();
timer.run();
// manually watering button
buttonvalue = digitalRead(button);
if (buttonvalue == 1)
{
delaysecond=1000*60*delayminute;
digitalWrite(relay,HIGH);
delay(delaysecond);
digitalWrite(relay,LOW);
delay(30000);
digitalWrite(relay_2,HIGH);
delay(delaysecond);
digitalWrite(relay_2,LOW);
}
}
void sendSensor()
{
float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V5, h);
Blynk.virtualWrite(V6, t);
}
BLYNK_WRITE(V1)
{
// You'll get HIGH/1 at startTime and LOW/0 at stopTime.
// this method will be triggered every day
// until you remove widget or stop project or
// clean stop/start fields of widget
Serial.print("Got a value: ");
Serial.println(param.asStr());
if (param.asInt())
{
digitalWrite(relay,HIGH);
}
else
{
digitalWrite(relay,LOW);
}
}
BLYNK_WRITE(V2)
{
// You'll get HIGH/1 at startTime and LOW/0 at stopTime.
// this method will be triggered every day
// until you remove widget or stop project or
// clean stop/start fields of widget
Serial.print("Got a value: ");
Serial.println(param.asStr());
if (param.asInt())
{
digitalWrite(relay_2,HIGH);
}
else
{
digitalWrite(relay_2,LOW);
}
}
It’s all the delays in your loop() causing Blynk to disconnect (it thinks your device is offline).
READ this:
User timers to remove the code from your loop(); and use millis() in stead of delay(). (Millis() will allow the rest of your code to continue to run, and remain connected to Blynk - where delay() stops everything in it’s tracks.
Two rules for Blynk . . . No delay() . . . keep your loop() clean . . .
Thank you for your reply.
I thought unless the buttonvalue has been triggered , the delay() won’t run.
Does it still cause the disconnection ?
I will try to remove the delay() and hope it can improve the problem.
Thank you.
I uploaded the new code yesterday.
At first one hour, the problem seems to be fine , after one hour, the problem appeared again.
But the frequency has become lower.
Here is my code and I disable the dealy() in the loop()
Is anything that I should do with the code ?
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SPI.h>
#include <DHT.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "XXXX";
#define DHTPIN 12 // What digital pin we're connected to
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21 // DHT 21, AM2301
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;
const byte relay = 13; //relay pin
const byte relay_2 =15 ; //repay_2 pin
const byte button = 14;
//button
int buttonvalue;
/*
int delayminute=1;
int delaysecond; */
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "XXX";
char pass[] = "XXX";
void setup()
{
// Debug console
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
// You can also specify server:
//Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 80);
//Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
// Setup a function to be called every second
timer.setInterval(60000L, sendSensor);
pinMode(relay,OUTPUT);
pinMode(relay_2,OUTPUT);
pinMode(button, INPUT);
dht.begin();
}
void loop()
{
Blynk.run();
timer.run();
/* buttonvalue = digitalRead(button);
if (buttonvalue == 1)
{
delaysecond=1000*60*delayminute;
digitalWrite(relay,HIGH);
delay(delaysecond);
digitalWrite(relay,LOW);
delay(30000);
digitalWrite(relay_2,HIGH);
delay(delaysecond);
digitalWrite(relay_2,LOW);
} */
}
void sendSensor()
{
float h = dht.readHumidity();
float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// You can send any value at any time.
// Please don't send more that 10 values per second.
Blynk.virtualWrite(V5, h);
Blynk.virtualWrite(V6, t);
}
BLYNK_WRITE(V1)
{
// You'll get HIGH/1 at startTime and LOW/0 at stopTime.
// this method will be triggered every day
// until you remove widget or stop project or
// clean stop/start fields of widget
Serial.print("Got a value: ");
Serial.println(param.asStr());
if (param.asInt())
{
digitalWrite(relay,HIGH);
}
else
{
digitalWrite(relay,LOW);
}
}
BLYNK_WRITE(V2)
{
// You'll get HIGH/1 at startTime and LOW/0 at stopTime.
// this method will be triggered every day
// until you remove widget or stop project or
// clean stop/start fields of widget
Serial.print("Got a value: ");
Serial.println(param.asStr());
if (param.asInt())
{
digitalWrite(relay_2,HIGH);
}
else
{
digitalWrite(relay_2,LOW);
}
}
I have changed the Wemos board and use another mobile phone but the problem has been solved.
What code should I add into the problem that I can see connecting result in the Serial monitor ?
Thank you !
void loop() {
timer.run();
if (Blynk.connected()) { // If connected run as normal
Blynk.run();
} else if (ReCnctFlag == 0)
{ //set timer to try to reconnect in 30 seconds
ReCnctFlag = 1; // Set reconnection Flag
Serial.println("Starting reconnection timer in 30 seconds...");
timer.setTimeout(30000L, []() { // Lambda Reconnection Timer Function
ReCnctFlag = 0; // Reset reconnection Flag
ReCnctCount++; // Increment reconnection Counter
Serial.print("Attempting reconnection #");
Serial.println(ReCnctCount);
Blynk.connect(); // Try to reconnect to the server
}); // END Timer Function
}
}
Your ping times seem to vary dramatically, so I guess you might be getting dropouts on your internet connection, maybe because of a contention issue?
Or, someone else in your household may be hogging the bandwidth (a bored teenager maybe?).
My router reboots every day and my families hardly use the wifi .
Is it possible that the distance between the router and arduino board is too far which causes the connection problem ? or the router is broken ?
I think that I had found the problem.
I used another board with the same code and put it closer to the AP.
It worked very well and keeping connecting with the server.
Then I thought that I put my original board in the metal box and it’s about 25m to the AP.
After I opened the cover of the metal box , it works very well in these two days.
