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https://github.com/vitorccs/arduino-halloween-witch

Fun Halloween toy made in Arduino whichs detects people presence and plays an audio of a witch laughing
https://github.com/vitorccs/arduino-halloween-witch

arduino platformio

Last synced: 21 days ago
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Fun Halloween toy made in Arduino whichs detects people presence and plays an audio of a witch laughing

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README 

        
# Arduino Halloween Witch

Fun Halloween toy made in Arduino which detects human presence and plays an audio of a witch laughing. 






## Video footage

Note: Before playing the video below, you must enable the sound by clicking on the toolbar button with a speaker icon:



[video.webm](https://github.com/vitorccs/arduino-halloween-witch/assets/9891961/8df2df78-2068-4461-9dc9-b7e5add590b6)



## Description

![ArduinoHalloween_bb](https://github.com/vitorccs/arduino-halloween-witch/assets/9891961/438a9ba2-e9ba-4de0-9060-833ce816f3ac)



This is a [Platform IO IDE](https://platformio.org/platformio-ide) project coded in C++.



Once a person is detected, the Arduino will firstly open and close the witch's legs twice, and afterwards will play an audio of a witch laughing.



Note: when using 04 AAA batteries (1.5v each, total 6v), you should connect the positive cable to the "VIN" pin since it has a built-in voltage regulator. However, with 04 rechargeable batteries (1.2v each, total 4.8v) it is acceptable to place the cable in "5v" pin. See [Arduino docs](https://docs.arduino.cc/learn/electronics/power-pins#vin-pin).



## Components

* 01 - HC-SR04 Ultrasonic sensor

* 01 - Speaker (8Ohms - 0.5 to 1.0 Watts)

* 01 - Micro Servo Motor 9g SG90 (or similar)

* 01 - BC547 transistor

* 04 - AAA batteries (or any 5v source supply)

* 01 - AAA batteries support



## About PlatformIO IDE

Platform IO is a plugin for Microsoft Visual Studio Code. It is a more robust IDE compared to the official Arduino IDE. It also allows us to easily create our own private libraries and use a more object oriented code.



## About the "witch hat"

You may create your own hat or buy any that fits the arduino components. 









Find below the components used to create the legs movement:



* 02 - Sticks (like chopsticks)

* 02 - Nylon clamps

* 01 - A mechanism which attaches to a servo motor and creates the movement of opening and closing the legs ([like this one](https://www.robocore.net/item-mecanico/garra-robotica-ant_v2))






## Steps to change the audio sample

1) Download and install [Audacity](https://www.audacityteam.org/download/)

2) Import the MP3 audio and make the audio louder (Effect > Amplify)

3) Export a new version in 8KHz in mono mode. The file should not exceed 30.000 bytes.

4) Download the encoder program for your operating system:

    * [EncodeAudio - Windows.zip](https://github.com/vitorccs/arduino-halloween-witch/files/13110714/EncodeAudio-windows.zip)

    * [EncodeAudio - MacoOSX.zip](https://github.com/vitorccs/arduino-halloween-witch/files/13110716/EncodeAudio-macosx.zip)

    * [EncodeAudio - Linux.zip](https://github.com/vitorccs/arduino-halloween-witch/files/13110717/EncodeAudio-linux.zip)

5) Unzip and run the application.

6) The application will prompt you to input an audio file. Select the audio file you have just created in the previous steps.

7) After a few seconds, the program will copy the encoded data to your clipboard

8) In the `main.cpp` file, delete the contents of `sample[]` array and paste the content from your clipboard. The data is a a very large sequence of numbers.



Sources:

* https://www.codrey.com/arduino-projects/arduino-pcm-audio-primer/

* https://highlowtech.org/?p=1963

* https://www.youtube.com/watch?v=aaqaAXlZbuc



## Fritzing file

The electronic schematic was created in the Fritzing software and can be downloaded at [ArduinoHalloween.zip](https://github.com/vitorccs/arduino-halloween-witch/files/13110614/ArduinoHalloween.zip)