How to Control Arduino Uno connected to phone, via computer

I just want to make an easy project. I want to Off and On led using a computer. The Arduino Uno board is connected to the phone. The phone is connected to the computer by mobile internet. What should I do?

Let’s start by you providing the information that was requested when you created this topic…

  1. Add details :
    • Hardware model + communication type. For example: Arduino UNO with Ethernet Shield
    • Smartphone OS (iOS or Android) + version
    • Blynk server or local server
    • Blynk Library version


  • Arduino Uno - The mobile internet is taken from the phone.
  • Android - Android 11
  • blynk server
  • v0.6.1

Would you like to elaborate on that, it’s a new one for me.


Internet by SIM card.

I understand how the phone connects to the internet, what I don’t understand is how the Uno is connected to the phone.


Usb cable.

And is this successful? Is your Uno showing as being online in the Blynk app?


No. Or if It can, I don’t know how to do that.

Im sorry… Im beginner.

You have a number of options…

  1. throw away the Uno and replace it with a NodeMCU, then connect via WiFi
  2. keep the Uno and add an ESP-01 as a WiFi modem
  3. keep the Uno and connect via an internet connected computer which is running the USB script in an open command window.
  4. keep the Uno and buy a Bluetooth adapter such as the HC-05 and connect to your phone via Bluetooth.

Option 1 is by far the simplest and most reliable, and probably cheaper than 2 or 4


You mean Arduino Uno connected to the phone via usb?

I’m sorry to ask

No, if I meant that I wouldn’t have said…

You should read this for more information on this connection method.