Example Code for Arduino-Record

Hardware Preparation

• FireBeetle ESP32 IoT Microcontroller(SKU: DFR0478) ×1
• Camera & Audio Media Board - FireBeetle Covers(SKU: DFR0498) ×1
• Micro SD Card (FAT32 File System) ×1
• USB Cable ×1

Software Preparation

• Download Arduino IDE: Click to Download Arduino IDE
• Download Arduino Library: Click to download DFRobot_IIS and refer to the guide: How to Install a Library?

Other Preparation Work

1. This media board only supports FireBeetle ESP32 main board at present, for other main boards do not equipped with IIS interface.
2. The flat ribbon cable of camera is relatively easy-to-break, please be careful and light in connection. The camera shot must be opposite to the SD card slot.
3. Do not support video shooting and transmission.

Download programs as below to ESP32 main control board and plug a SD Card.

Once the board connected to microphone by MIC, the other onboard microphone is disabled.

Sample Code

Pressing to record when downloaded, repressing the button to stop and save the file: record.wav to SD card and press to play it.

/*!
 * @file DFRobot_IIS.h
 * @brief DFRobot's IIS Record Module
 * @n IIS Module for Record sound and Save WAV file in SD card
 *    Insert sd card
 *    Call the function by pressing user key to control recorder
 *    This Module will record sound and save it as record.wav then play record.wav
 */

#include <Wire.h>
#include <DFRobot_IIS.h>

DFRobot_IIS iis;
const int buttonPin = 16;
enum Status{
    ePrepare,
    eRecording,
    eStop
}eState=ePrepare;

void setup(){
    Serial.begin(115200);
    iis.SDCardInit();                              // SD card init
    iis.init(AUDIO);                               // Init Audio mode
    iis.initRecorder();                            // Init recorder
    iis.initPlayer();                              // Init musice player
    iis.record("/record.WAV");                     // Enter file name to save recording
    Serial.println("Ready to record");
}

void loop(){
    static unsigned long timepoint = millis();
    static byte count = 0;
    if(millis()-timepoint > 200){
        if((!digitalRead(buttonPin))&&eState==ePrepare){
            timepoint = millis();
            iis.recorderControl(BEGIN);            // Begin recording
            Serial.println("Recording");
            eState=eRecording;
        }else if((!digitalRead(buttonPin))&&eState==eRecording){
            timepoint = millis();
            iis.recorderControl(STOP);             // Stop recording
            Serial.println("Stop and save data");
            eState=eStop;
        }else if((!digitalRead(buttonPin))&&eState==eStop){
            timepoint = millis();
            iis.playMusic("/record.WAV");          // Play your record
            iis.setSpeakersVolume(50);
            iis.setHeadphonesVolume(50);
            iis.playerControl(PLAY);
            eState=ePrepare;
        }
        delay(100);
    }
}

Result

Button triggers record→stop save→play audio in order, Serial prints status.

Functions

• Initialize SD card in the beginning.

SDCardInit():

• Enter AUDIO mode, state its mode (AUDIO / CAMERA) in use when the SD card is initialized.

init(AUDIO):

• Initialize the recorder: to prepare for calling the record function in AUDIO.

initRecorder():

• Name the record file that will be saved to the SD card, call and play.

record("/record.WAV"):

• Recorder control: to play, pause, stop and save in order.

recorderControl(BEGIN),recorderControl(STOP):