Electronic Greeter

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This Electronic Greeter will play happy music when someone walks by.

Electronic greeting-music.jpg


Microduino-PIR sensor will detect if there is someone moving. If there is, this device will get lighten and play music, which lasts for a while and then stop.

Electronic greeting-sch.jpg


Module Number Function
mCookie-CoreUSB 1 Core board
mCookie-Hub 1 Sensor pin board
mCookie-Audio 1 Audio module
mCookie-Amplifier 1 Amplifier module
mCookie-BM 1 Battery management
Microduino-PIR 1 Pyroelectric Infrared Radiation sensor
Microduino-Color led 1 Colored light
  • Other Equipment
    • Two Loudspeakers
    • One cell of battery
Electronic greeting-module1.jpg
Electronic greeting-module2.jpg

Program Download

  • Setup 1:Connect CoreUSB and PC/Mac with an USB cable, and open Arduino IDE.
CoreUSB Ble pc.jpg
  • Setup 2:Click file>example>> mCookie > _204_JoyfulGreeter.
Electronic greeting-upload2.jpg
  • Setup 3:Select the right board card and COM port, then download the program.
Electronic greeting-upload3.jpg

Software Debugging

  • Function description:
    • ” audio.h”(File that controls Audio to play music.)
    • “colorWipe()”(Function to control LED color.)
  • Serial port usage of the Audio module needs to be decided jumpers on the board. Default Serial (2,3)
#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

//#define AUDIO_PORT Serial1    //Core+
#define AUDIO_PORT mySerial  //Core
  • Control pin description
#define humanHotSensor 4//PIR sensor D4 
#define PIN 6//Colored light
  • Send serial instruction to control Audio by detecting human movement via PIR.
  if (humanHotState) {
    colorWipe(strip.Color(125, 125, 125));//The colored light is on 

    if (!playing) {
      Serial.println("play sound.....");
      // audio_play();
      audio_choose(1);//Play audio 
      playing = true;
    playing = false;
    Serial.println("stop sound.....");
    colorWipe(strip.Color(0, 0, 0));

Hardware Buildup

  • Setup1:Connect PIR sensor to D4 pin of Sensorhub and colored light to D6 pin.
Electronic greeting setup 1.jpg

For connection method, please refer to the following picture. Mind connection order, which starts from LED interface IN to Out. It can control six LED lights at most.

CoreUSB Ble steup11.jpg
  • Setup 2:Insert TF into AudioShield.
MusicBox Joystick TF.jpg
  • Setup 3:Stack AudioSheild and Audio together for TF card reader use. Connect PC via Auido, you can save music into TF card. Here it can only save one piece of music and the play duration shouldn't be long.
  • Setup4:Connect two loudspeakers to Amplifier and stack Audio, AudioShield and Amplifier.
Electronic greeting 3 speak.JPG
  • Setup5:Connect the activated battery box to BM.


  • Setup6:Stack all the modules without fixed order (Except that Audio, AudioShield and Amplifier should be stacked together.)
Electronic greeting steup ok.JPG

(Attention! Audio must be powered through BM, which cannot be connected to computer and powered through Coreusb or it will fail to work.)


When it detects someone moves, the colored led will turn on and play music. You can build a beautiful frame with LEGO.

Electronic greeting legao-ok.JPG