If you don't have any shield and your hardware doesn't have any connectivity, you can still use Blynk – directly over USB.

Getting Started

  1. Optional, but recommended.Connect additional USB-Serial adapter to your device to see the debug prints.
  2. Open Arduino Serial USB example and change Auth Token
  3. Run the blynk-ser script, located in scripts folder:
  • Windows: My Documents\Arduino\libraries\Blynk\scripts
  • Mac: ~/Documents/Arduino/libraries/Blynk/scripts
  • Linux: ~/Arduino/libraries/Blynk/scripts

The script is simply redirecting traffic to Blynk Cloud.

You can specify port, baud rate, and server endpoint like this:
./blynk-ser.sh -c <serial port> -b <baud rate> -s <server address> -p <server port>

For instance:
./blynk-ser.sh -c /dev/ttyACM0 -b 9600 -s blynk-cloud.com -p 8442

Run blynk-ser.sh -h for more information

Be sure to select the right serial port (there may be multiple).

Attention! Arduino IDE may complain with "programmer is not responding". You need to terminate script before uploading new sketch. 

On Windows

Open cmd.exe (you may need to "Run as Administrator")
Navigate to scripts folder:

cd C:\...\libraries\Blynk\scripts

Run blynk-ser.bat file. For example : blynk-ser.bat -c COM4 (where COM4 is port with your Arduino)And press "Enter", press "Enter" and press "Enter"

On Linux and Mac

Navigate to scripts folder:

cd User$/Documents/Arduino/libraries/Blynk/scripts

When inside this folder, run:

user:scripts User$ ./blynk-ser.sh

You may need to run it with sudo:

user:scripts User$ sudo ./blynk-ser.sh

This is what you'll see in Terminal app on Mac (usbmodem address can be different):

[ Press Ctrl+C to exit ]
/dev/tty.usbmodem not found.
Select serial port [ /dev/tty.usbmodem1451 ]:

Copy the serial port address: /dev/tty.usbmodem1451 and paste it back:

Select serial port [ /dev/tty.usbmodem1451 ]: /dev/tty.usbmodem1451

After you press Enter, you should see an output similar to this:

Resetting device /dev/tty.usbmodem1451...
Connecting: GOPEN:/dev/tty.usbmodem1451,raw,echo=0,clocal=1,cs8,nonblock=1,ixoff=0,ixon=0,ispeed=9600,ospeed=9600,crtscts=0 <-> openssl-connect:blynk-cloud.com:8441,cafile=/Users/.../server.crt,nodelay
2015/10/03 00:29:45 socat[30438.2046857984] N opening character device "/dev/tty.usbmodem1451" for reading and writing
2015/10/03 00:29:45 socat[30438.2046857984] N opening connection to LEN=16 AF=2 45.55.195.102:8441
2015/10/03 00:29:45 socat[30438.2046857984] N successfully connected from local address LEN=16 AF=2 192.168.0.2:56821
2015/10/03 00:29:45 socat[30438.2046857984] N SSL connection using AES128-SHA
2015/10/03 00:29:45 socat[30438.2046857984] N starting data transfer loop with FDs [3,3] and [4,4]

Additional materials:

Video tutorials : 

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