Ok I have checked alot about this. How to send email when I get on first digital input 5V.
There are many solution I need the most simple one.
just to send email when one of input get signal.
but I have one more request. Email should only be send out when this file on my werb server exist. Like below
http://myserver.com/test/fileexist.php
if this file doesn't exist than mail should not be send out.
which arduino should I use?
Can I use arduino nano with wifi or lan module?
Should I use arduino uno with wifi?
or maybe ESP32?
any advice how do I start woul be appreciated.
Thank you
Out of your list, the ESP32 probably the easiest to do that.
- ESP32 Send Emails using SMTP Server: HTML, Text, Attachments (Arduino IDE) | Random Nerd Tutorials
- ESP32: HTTP GET Requests - techtutorialsx
and if you need a web server for configuration
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thank you for info
what about that file
http://myserver.com/test/fileexist.php
how to implement this in code, to start sending emails out only when this file exist.
when it doesn't it will not send email out.
http://myserver.com/test/
Poor combination! Too many pieces involved!
Overkill!
An ESP8266 module - such as a WeMOS D1 Mini or just a ESP-01 though this requires a 3.3 V supply - would do just fine. 
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