Here, we will demonstrate how to use this kit to make a remote family message board. We can send messages to this message board remotely through the Blynk APP.
Before starting this lesson, you can get more information about the I2C 1602 LCD display from this link.
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:
If you haven’t install Liquid_Crystal_Display_I2C Library in Arduino IDE, Please download the zip file from following link:
https://osoyoo.com/wp-content/uploads/samplecode/LiquidCrystal_I2C.zip
In Arduino IDE, click Sketch->Include Library ->Add .ZIP library and upload the library zip files to the IDE.
If you have completed installation of all the libraries required, then you can go to next stage:
Note: In the sketch, find these code in line 13,14 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 18,19 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 legacy APP
Now we need to add a Text Input widget to get the real time distance value. Please Follow the next steps:
Widget Setting
Open your project page and press the “+” button to add the “Text Input” Widget.
Name Column: You can name your widget, whatever you like.
PIN: V10
CHARACTERLIMIT: 16
Click the text input field, enter what you want to say (up to 16 characters), click the send button to send, and then you can see your message is displayed on the 1602 LCD screen.
Now we enter “Hello OSOYOO!” here, and leave a message telling the family that they need to do housework. Does it feel convenient and fun?
You can also write code to scroll the words on the LCD screen, and you can also try to display your message on another line on the screen, as long as you are willing to use your brain, these are not difficult.
If you find the device is offline, please check your code, wiring and app settings, and try again.
