Microduino Electronic welcome device

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  • Project: Microduino Electronic Welcome Device
  • Objective: Use Microduino core and two pyroelectric infrared sensor to identify the human body in and out, then use the Microduino LM4863 to play different audio.
  • Difficulty: High
  • Time-consuming: 5 hours
  • Maker: Microduino Studio-YLB

Bill of Materials

  • Microduino equipment
Module Number Function
Microduino-Core 1 Core board
Microduino-FT232R 1 Download program
Microduino-LM4863 1 Play audio
Microduino-SD 1 Read memory card
Memory card 1 Store audio file
  • Other equipment
pyroelectric infrared sensor 2 Identify body
pegboard 1 Set up circut
9_Pin Row needles 3 Fix Microduino core
Horn 1 play audio
Soldering iron 1 welding tool
Mobile power supply 1 power supply
Solder 1 welding tool
Wire 1 welding tool
tweezers 1 welding tool


Download pyroelectric infrared sensor HC-sr501 material:


  • Step 1: Prepare the experiment equipment
Welcome devicesjpg all.jpg
  • Step 2: Welding circuit
Welcome devicesjpg Schematics1.jpg
Welcome devicesjpg Schematics2.jpg

Welding the circuit according to the schematic. The front after welding:

Welcome devicesjpg Schematics3.jpg

The back:

Welcome devicesjpg Schematics4.jpg

Use the multimeter to measured if the welding is correct.

Welcome devicesjpg Measure.jpg

Measuring principle: use wire connect two nodes, the resistance is almost zero. Measurement method: use the multimeter ohm, if the display value close to 0, that means welding success, otherwise there is a problem. Then need to measure the power and GND whether short circuit.

  • Step 3: Change the pyroelectric infrared sensor, welding a resistor(330Ω) and a LED between 5V and OUT node;
Welcome devicesjpg Change.jpg

Reason: When the sensor detects the body, OUT pin will output high level, using the LED to display, so easy to debug.

  • Step 4: Set up circuit
    • Stack all module and plug in to control board.
Welcome devicesjpg Control1.jpg
    • Connect the sensor and power on, check if the sensor can work.
Welcome devicesjpg Control2.jpg
  • Step 5: Get the audio file

    • Install software
    • Open the software and generate the audio file
  • Step 6: Convert the generated file

  • Step 7: Start to debug the program
    • Adjust the delay time and induction distance to a minimum, easy to debug
Welcome devicesjpg Adjust1.jpg
    • Integrated all module together, and insert a bread board between the two sensors in order to separate, preventing signal interference.
Welcome devicesjpg Adjust2.jpg
    • Download and open the test program, select the board "Microduino Core (Atmega328P@16M,5V)", download directly.
    • Put the hand to the sensor, test it.
  • Step 8: After finished debug, install it on door.
    • Using mobile power supply, and convenient.
Welcome devicesjpg steup1.jpg
    • One Sensor installed inside the door, another installed outside the door, used to identify the body in and out, need to adjust the sensor installation position and angle, and adjust the delay time and induction distance, in order to achieve the best effect of detection.
Welcome devicesjpg steup2.jpg
Welcome devicesjpg steup3.jpg


Enter the room, it automatically broadcast: "master: hello! Welcome back", and go out automatically broadcast: "master remember to lock the doors and Windows", similar to the electronic welcome device.

The issue need pay attention

  • The welding circuit can't go wrong;
  • Sensor position should be correct.