Blynk with Wemos d1 R2 V2.1 (esp8266) goes online and offline repeatedly

[fred66107]

Thank you for you help.
I have tried the code and seen the result in serial monitor.
Here is the result

＂[7032] Connecting to blynk-cloud.com:80
[7303] Ready (ping: 87ms).
[902539] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #1
[932840] Connecting to blynk-cloud.com:80
[933061] Ready (ping: 94ms).
Starting reconnection timer in 30 seconds…
Attempting reconnection #2
[1208664] Connecting to blynk-cloud.com:80
[1209019] Ready (ping: 166ms).
[1642136] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #3
[1672437] Connecting to blynk-cloud.com:80
[1677438] Connecting to blynk-cloud.com:80
[1677665] Ready (ping: 100ms).
[1975892] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #4
[2006193] Connecting to blynk-cloud.com:80
[2011194] Connecting to blynk-cloud.com:80
[2014418] Ready (ping: 141ms).
[2116728] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #5
[2147029] Connecting to blynk-cloud.com:80
[2148272] Ready (ping: 180ms).
[2187558] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #6
[2217859] Connecting to blynk-cloud.com:80
[2218153] Ready (ping: 96ms).
[2656357] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #7
[2686658] Connecting to blynk-cloud.com:80
[2686885] Ready (ping: 126ms).
[2874698] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #8
[2905227] Connecting to blynk-cloud.com:80
[2906757] Ready (ping: 100ms).
[3092044] Heartbeat timeout
Starting reconnection timer in 30 seconds…
Attempting reconnection #9
[3122345] Connecting to blynk-cloud.com:80
[3122574] Ready (ping: 116ms).
Starting reconnection timer in 30 seconds…
Attempting reconnection #10
[4138587] Connecting to blynk-cloud.com:80
[4140909] Ready (ping: 1215ms).
＂
It has connected for 10 times in one hour.

[Blynk_Coeur]

So, now you can see that your connection isn’t stable.
You also can see that the ping is high
this is mine
Réponse de 45.55.96.146 : octets=32 temps=105 ms TTL=49
Réponse de 45.55.96.146 : octets=32 temps=105 ms TTL=49
Réponse de 45.55.96.146 : octets=32 temps=104 ms TTL=49
Réponse de 45.55.96.146 : octets=32 temps=105 ms TTL=49

[PeteKnight]

@fred66107

ping: 1215ms

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?).

Have you tried rebooting your router etc?

Pete.

[Blynk_Coeur]

@PeteKnight

a bored teenager maybe?

Netflix

[fred66107]

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 ?

[Blynk_Coeur]

You have to get the signal strength

    Signal = WiFi.RSSI();
    Serial.print("Signal ");
    Serial.println(Signal);

[fred66107]

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.

I really appreciate for your help.
Thank you!!

[Blynk_Coeur]

Yes , it’s a Faraday cage

[fred66107]

@Blynk_Coeur

Faraday

I have to change the case to plastic material.

[Blynk_Coeur]

Yes it should be better

[PeteKnight]

@fred66107

I have to change the case to plastic material.

Or change to a D1 Mini pro with an external antenna (just don’t forget to move the zero ohm resistor).

Pete.

[fred66107]

I got it ! Thank you !!

[Blynk_Coeur]

You can try that

[PeteKnight]

He wasn’t kidding when he said he want an expert!
The problem is that with a metal box you really need screened (coax) cable between the board and the outside of the box, then a well designed antenna that’s going to be waterproof. Like this:

Which board should I choose for my first Blynk project?

Hi @laurent, one of the locations where I needed to fit a Wemos was outside, in a box that was going to be both strong and waterproof. I decided to use a diecast aluminium box, which meant that the Wemos was almost totally shielded. Using a Pro board and external antenna was an easy fix. [image] I also have another location where the the Wi-Fi signal is fairly weak and I’ve used used a similar solution there. I’ve found that the antennas you buy on eBay vary enormously in terms of gain, and …

Pete.

[Blynk_Coeur]

Yes but, you can solder a coax cable too

[fred66107]

I have changed the Wemos R1 V2.1 to Wemos mini pro . Hoping that it can work well.

[PeteKnight]

That antenna will work better if the ground connection is in contact with the metal box, the box will act as a ground plane then.
But, if you’re going to drill a hole in the box to mount the antenna then pit it on one of the sides or the bottom to stop water getting in when it rains.

Pete.

[fred66107]

I use the antenna as the picture . Do you mean that I can use the SMA to lock on the box ? I have drilled a hole on the side of the box ! I use it indoor so there is no water problem.

[PeteKnight]

Yes, there should be some locknuts and washers with the antenna. Drill a hole and pass the brass bit through it then put the locknut and antenna on. Make sure you clean-up the area around the hold so that the brass part gets good electrical contact with the box.

Pete.

[fred66107]

Thank you , sir . I will try it.