And if I want to connect the board with the server I add these lines?
Blynk.begin(BLYNK_AUTH_TOKEN, wifi, ssid, pass, "blynk.cloud", 80);
Blynk.begin(BLYNK_AUTH_TOKEN, wifi, ssid, pass, IPAddress(192,168,1,100), 8080);
How to declare the IPAddress function ? Like this?
#define IPAdress
Thanks
And for the serial Monitor, I have put Boot NL & CR and 115200 baud.
It just? I have unreadable writing.
Thank you for your help
No, the Blynk.begin command you have is all that is needed.
In that case, try each of the available baud rates in your serial monitor, rebooting the Uno each time, until you get a readable output.
What settings do you have for the jumpers and the fun/flash switch?
Pete.
The switch is on fun and the mini-jumper are on USB (TX and RX).
I really think you ought to abandon this hardware and use a NodeMCU or ESP32 board instead of the Uno + WiFi shield.
Using your existing hardware requires a good hardware knowledge and understanding of how the Blynk library works. You clearly aren’t understanding the principals, and you don’t have the knowledge to troubleshoot issues in getting this to work.
The last time I suggested this you said…
but your current setup is complicated, far more complicated than a NodeMCU or ESP32 based project.
Pete.
NodeMCU cost is less than 3$, stop using old boards, throw them in the trash 
Ok but what are the characteristics for NodeMCU for my project ?
I have find that :
Module NodeMCU ESP32 - WiFi | GO TRONIC a little more expensive than 3$.
And that : Module ESP8266 ESP12-E - OTRONIC
thank you
What do you mean?
Don’t buy a bare module (your last link) it needs to be mounted on a dev board like your first link.
This looks like a very expensive supplier.
Pete.
What is the exact name of this board ?
What do you mean?
I wanted to know the characteristics for NodeMCU board so that it is compatible with my project. In addition, I would like to add an SD card reader in addition to the DHT11. Are there the necessary pins for this? Does the Arduino IDE software allow you to program a NodeMCU board?
Thank you
ESP8266 based NodeMCU boards and ESP32 dev boards have built-in WiFi, so you don’t need a separate board/shield to provide WiFi connectivity.
Bothe boards need their own type of add-in to the Arduino IDE to make them work, this is known as the “core” and it’s very easy to add.
The Core allows you to access built-in networking functionality in a much more comprehensive an integrated way than using an ESP8266 running AT firmware like your WiFi shield does.
The NodeMCU and ESP32 use 3.3v logic levels as opposed to 5v for the Arduino, but this makes no difference when working with sensors like the DHT11 (which incidentally is an awful sensor) or an external SD card reader.
However, working with SD card readers is quite difficult, regardless of which board you use. It requires you to set-op an manage the file system on the SD card and manage the read/write processes, which isn’t intuitive. You may find that you don’t need an SD card when using Blynk though, but as you haven’t shared any details about your project it’s difficult to say.
From what you have said, you’d be better with an ESP32 dev board, as it gives you more GPIO pins.
Pete.
Ok I will look
