Here, we will demonstrate how to use this kit to remotely collect the data detected by the ultrasonic ranging sensor and display it on the mobile phone through the Blynk APP.
Some people may think that this sensor is rarely seen in ordinary times. In fact, we often use it in apartment garage systems and smart security systems.
First, please plug OSOYOO MEGA-IoT Extension Board into MEGA2560 board:
Build the circuit as below:
Here we connect the Echo to port D25, connect the Trig to port D26.
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:
Step 2 After above operations are completed, connect OSOYOO MEGA2560 Board to PC with USB cable.
Notice: Shut off your battery or unplug your power adapter when upload sketch code to Arduino.
Step 6 Open Arduino IDE: Choose corresponding board type and port type for you project.
Step 7 Arduino IDE: Click file – Open, then choose code in the folder, load up the sketch onto your Arduino.
Note: In the sketch line 13,14, find these lines 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 21,22 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
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 Labeled Value widget to get the real time distance value. Follow the next operations:
Widget Setting 1
Open your project page and press the “+” button to add the “Labeled Value” Widget.
Name Column: Distance
PIN: V4
LABEL: pin/cm
After you finished all above operations, press the “▷“ 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 “□” and get back to EDIT mode.
Widget Setting 2
In addition, you can also add GAUGE widget or Level H widget to demonstrate the changes in the values collected by the sensor.
GAUGE widget settings:
Name: Distance
INPUT: V4:0-300
LABEL: Distance:/pin/cm
Widget Setting 3
Level H widget settings
Title:Distance
INPUT: V4:0-300
Keep orther settings as default
Now you can remotely view the value detected by the ultrasonic distance sensor through the Labeled Value widget, GAUGE widget or Level H widget, you can clearly see the changes in the values collected by the sensor
If you find the device is offline, please check your code, wiring and app settings, and try again.
