Here we will use OSOYOO IoT kit and Blynk APP to remotely control the door.
In this lesson, we actually simulate opening and closing the door by remotely controlling the rotation of the servo. By using the Blynk button widget, we press the button on the phone, the door will be opened, and press the button again, the door will be closed. By sliding the Slider widget on the Blynk APP, we can control the opening and closing range of the door
First, please plug OSOYOO MEGA-IoT Extension Board into MEGA2560 board:
Build the circuit as below:
Prerequisite:
You need to install Local Blynk Server, Blynk APP, Arduino IDE, Blynk Libraries before running the code of this lesson. We suppose you have installed them in previous lessons. If you haven’t done these installations, please read following contents in lesson2-1 link:
You also need to install the Servo library as above operations.
If you haven’t done servo test in lesson 2-5, please read Door Servo Test and do the servo test first. If you have adjusted the servo before, please skip this step.
After you complete library installation and servo adjustment, you can go to next stage:
Note: In the sketch, find these code in line 14,15 as following:
char auth[] =”0ByWpc50cmOJ5O6OyHMaK4OSHkDvUeI-”;
char server_ip[]=”192.168.1.81″; // replace this line with your Blynk Server IP addres;
Replace 0ByWpc50cmOJ5O6OyHMaK4OSHkDvUeI- with your local Blynk Token.
Replace 192.168.1.81 with your local Blynk Server LAN IP address.
If you don’t know how to get token and Server IP address, read this article.
In lines 19,20 and replace *** with your wifi ssid/password
char ssid[] = "***";//replace this line with your wifi ssid
char pass[] = "***"; //replace this line with your wifi password
please replace the *** with your correct wifi SSID and password, otherwise your project can not connect to Internet.
Upload the sketch to the board. Wait until you see something like this:
Done uploading
Now open your Serial Monitor, you will see Arduino is trying to talk to Blynk server. After 20 to 30 seconds, your Serial monitor will finally shows Arduino’s IP address and a “Ready (ping: 25ms)” ending message.
Congratulations! You are all ready! Your hardware is now connected to the Blynk server.
Add a Widget in Blynk APP
Open your project page and press the “+” button to add the “Slider” Widget.
Slider Widget Settings
Name Column: Door
OUTPUT: V9 | 0~180
After you finished all above operations, open the serial monitor,then open the Blynk APP, press the PLAY button. This will switch you from EDIT mode to PLAY mode where you can interact with the hardware. While in PLAY mode, you won’t be able to drag or set up new widgets, press STOP and get back to EDIT mode.
Now, you’ll see the servo turning with the slider!
While in PLAY mode, you won’t be able to drag or set up new widgets, press “□” and get back to EDIT mode.
If you find the device is offline, please check your code, wiring and app settings, and try again.
Here, we will show how to use the button widget on Blynk to open and close the door remotely. The preparation and hardware wiring are the same as the previous experiments.
Open your project page and press the “+” button to add the “Button” Widget.
Button Widget settings:
Name Column: Door
OUTPUT: V8 | 1-0 (V stands for virtual)
MODE: We choose the Switch mode here.
You can modify other options according to your own habits or keep them as default.
Running Result
After you finished all above operations, open the serial monitor,then open the Blynk APP, press the PLAY button. This will switch you from EDIT mode to PLAY mode where you can interact with the hardware. While in PLAY mode, you won’t be able to drag or set up new widgets, press STOP and get back to EDIT mode.
Now, press the “Door” button on the APP, the door will be opened, and press the button again, the door will be closed.
If you find the device is offline, please check your code, wiring and app settings, and try again.
