EBC Exercise 35 Blynk

Embedded Linux Class by Mark A. Yoder

Blynk is a simple way to control your BeagleBone from a device such as a cellphone.

Installing Blynk - python

On your Bone

bone$ sudo pip3 install blynklib
bone$ cd exercises/iot/blynk

Set up the Project

Now you need to build a project to talk to your Bone.

Go to Getting Started With The Blynk App and follow the steps there, with these additional instructions:

• On step 3 (Choose Your Hardware) select Generic Board.
• On Step 5 (Add a Widget) make your button attach to Virtual 0.
• Edit setup.sh to have your AUTH key.

bone$ ./leds.py

• Run the project on your phone and when you tap the virtual button on your device, the USR3 LED should respond.

Note: I was running ssh on a port other than 22 and Blynk didn't work. Switching back to port 22 fixed it.

Add a Virtual LED

Add a virtual LED by doing the following.

1. Stop your project by tapping the square in the upper right.
2. Get a new Widget by from right to left.
3. Scroll down to DISPLAYS and selecting LED.
4. Tap the LED and connect it to Virtual pin V10.
5. Tap OK on the upper right.
6. Hit the play triangle on the upper right.

Now when you click a button attached to P9_11, the virtual LED should toggle.

Installing Blynk - JavaScript

To install Blynk, got to Getting Started with Blynk and follow the first two instructions for installing Blynk on your device and getting the Auth token.

Then on your Bone

bone$ sudo npm install -g --unsafe-perm onoff blynk-library

(If that doesn't work try: sudo npm install onoff blynk-library)

npm is a JavaScript package manager. Once loaded you can run the Blynk example.

bone$ cd exercises/iot/blynk
bone$ ./leds.js

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Embedded Linux Class by Mark A. Yoder