This lesson is our final project, which is a little bit complicated and more exciting. In the previous lesson, we only used a browser or cell phone to make humans talk. In this lesson, we will use one mainboard to communicate with another mainboard through the Internet UDP protocol. You need to buy two sets of our IoT learning kits. We will use the first OSOYOO basic board (called basic A) to connect a PIR motion sensor, and another mainboard (basic B) to connect a buzzer. When an intruder is detected by the PIR motion sensor in basic A, an alarm signal will be sent from basic A to basic B, and the buzzer will beep.
OSOYOO Basic board x 2
OSOYOO ESP8266 Wi-Fi Shield x 2
HC-SR501 PIR motion sensor x 1
Buzzer sensor module x 1
USB cable x 2
Jumper wires
Insert the ESP8266 Wi-Fi Shield into your mainboard
And ensure the jumper cap is connected from E_TX to D4 and E_RX to D5.
Hardware A) Connect the OSOYOO Basic Board+ESP8266 Wi-Fi shield to the PIR motion sensor. The motion sensor’s central OUT pin connects to D3.
OSOYOO Basic Board
PIR
D3
OUT
GND
GND
5V
VCC
Hardware B) Connect the OSOYOO Basic Board B+ESP8266 Wi-Fi shield to the buzzer. The buzzer I/O pin connects to D9.
OSOYOO Basic Board
Buzzer
D9
I/O
GND
GND
5V
VCC
Step A)Install the latest IDE (if you have IDE version 1.1.16 or later, please skip this step). Download the IDE from https://www.arduino.cc/en/Main/Software?setlang=en and then install the software.
Step B) Connect the OSOYOO Basic Board to the computer via a USB cable.
Step C) Open the IDE and choose the corresponding board type and port type for your project.
Board:”Arduino/Genuino UNO”
Port: Choose your own serial port for your mainboard
After unzipping the above file, you will see a folder, “esp8266-lesson12.” Enter this folder, and you will see two sub-folders (buzzer and motion sensor).
Enter the buzzer folder and double-click the buzzer.ino file, find the following lines:
char ssid[] = "******"; // your network SSID (name)
char pass[] = "******"; // your network password
Please replace the ****** with your correct Wi-Fi SSID and password, otherwise,
your project cannot connect to the Internet.
Step E) After changing the above lines, load the sketch into the IDE.
Open your Serial Monitor, and you can see your router will assign an IP address to your IDE as follows:
In the above example, 192.168.50.31 is the IP address assigned by the router to your buzzer IDE. You have to write down this IP address on paper. We need to use this IP address to change the sketch code in the motionsensor.ino file.
You can unplug this IDE from PC and use some other USB adapter to power this buzzer IDE.Step F) Now, connect your PIR motion sensor IDE to your PC, open the motionsensor folder and open the motionsensor.ino file, find the following lines:
char ssid[] = "******"; // your network SSID (name)
char pass[] = "******"; // your network password
Please replace the ****** with your correct Wi-Fi SSID and password, otherwise, your project cannot connect to the Internet.
Step 5) Then, search for the following line:
byte remoteIp[] = { 10,0,0,244 }; //...
You need to change the line’s remoteIp[] variable, replace the IP address 10.0.0.244 with the one you recorded from Step A. In our example, Step A shows the buzzer IDE IP is 192.168.50.13, so we make the line:
byte remoteIp[] = { 192,168,50,31 }; //…
Then you can compile and upload the motionsensor.ino file to IDE.
Test result:
Turn on power of both ESP8266 shield and OSOYOO Basic boards. When you move your hand in front of the motion sensor, the remote buzzer will beep.
