Virtual Pin is a concept invented by Blynk Inc. to provide exchange of any data between hardware and Blynk mobile app.
Blynk lets you control any hardware connected to Digital and Analog pins without having to write any additional code.
For example, if you need to turn On/Off LED connected to Digital pin, you don't have to write any code:
Just use BlynkBlink code for your hardware.
In the Blynk app - add Button Widget and set it to pin D8
That's it! No additional code is required. Simply press Play in the app.
That was, easy, right? But what if you need more flexibility?
Virtual pins allow you to interface with any sensor, any library, any actuator.
Imagine that there are "virtual" pins that you can use
Think about Virtual Pins as a box where you can put any value, and everyone who has access to this box can see this value.
It's a very powerful feature to display and send any data from your hardware to Blynk app.
☝️ Remember, that virtual pins have no physical properties.
There are two fundamental commands you need to know to use Virtual Pins:
To read data from Blynk app widgets
Use this block of code:
BLYNK_WRITE(V5) // V5 is the number of Virtual Pin
int pinValue = param.asInt();
param.asInt() is the value from V5.
👉 Full article: How to control anything with Blynk
To send data from your hardware to Blynk app
Use this command
Blynk.virtualWrite(V5) where V5 is the Virtual Pin you are using.
– Read here
👉 Full article: How to display any sensor data with Blynk
If you have questions or something is not working, visit our 👥 community page.
Also, full 📗 documentation is here.