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In this lesson, we will show you how to use a sound sensor to detect the sound intensity of the environment and monitor the data using an app. The sound sensor is designed to detect whether there is any sound surrounding it. Please note that it should not be used to collect sound signals. The sound sensor module has a built-in capacitive electric microphone that is highly sensitive to sound. When sound waves cause the thin film of the electric to vibrate, the capacitance changes, producing the corresponding voltage change. Therefore, it can detect the sound intensity in the ambient environment. You can adjust the sensitivity by adjusting the potentiometer.
- OSOYOO Basic board x 1
- OSOYOO ESP8266 WIFI Shield x 1
- Sound detector sensor module x 1
- USB cable x 1
- Jumper wires several
First, please insert the ESP8266 Wi-Fi Shield into your motherboard.
- Make sure that the jumper cap is connected from E_TX to D4 and E_RX to D5.
Connect the sound sensor to the motherboard as shown in the diagram.
| OSOYOO Basic Board |
Sound sensor |
| D9 |
OUT |
| GND |
GND |
| 5V |
VCC |
Software Installation
Step A) Install the latest IDE from https://www.arduino.cc/en/Main/Software?setlang=en. (If you have IDE version 1.1.16 or later, please skip this step).
Step B) Connect the motherboard to the computer via 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
Step D) Download the sketch file from https://osoyoo.com/driver/wifi-iot/lesson10/wifi-lesson10.zip, unzip the file and double-click on the esp8266-lesson10.ino file to load the sketch into the IDE.
- 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.
Step A) Open your Serial Monitor. You can see that your router will assign an IP address
to your IDE, as shown in the following example:
In the above example, 192.168.1.81 is the IP address of my IDE. We need to set this IP address in our app in the next step.
Step B) Open your OSOYOO IOT UDP Robot app. If you haven’t installed this app, please read the APP installation section in Lesson 2.
Step C) Make sure your cell phone is on the same local network as your Arduino. Open the app, click on Settings, enter your Arduino IP address from Step F, and Port to 8888 in Settings.
Now, press any key on your app, and your Arduino will start to send sound status data to the app. When noise is detected, the app will show “Noisy!”. Otherwise, the app will show “Quiet!” as shown in the following picture.
