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In this instructable I am going to show you how to build a fart and smoke alarm hidden in a Minion. This build is the result of me brainstorming with my boyfriend. We wanted to build something with a Minion for quite some time, because the second Minion movie was the first movie we watched together.

Since our favourite scene in the whole movie is the fire alarm scene we decided to build our own alarm minion. You can watch the scene here, should you not be familiar with it:

Our version:

Disclaimer
This project is mainly for fun. Eventhough it certainly works I wouldn't rely solely on it in critical setups. For actual use it has to be calibrated correctly.

Step 1: Stuff You Need

For the electrical circuit:

  • 1 x Arduino Pro Mini (e.g. here)
  • 1 x WTV-020 MP3 player module (e.g. here)
  • 1 x LM386 amplifier (e.g. here)
  • 1 x MQ-2 sensor for Arduino (e.g. here) *
  • 1 x AMS1117 3.3 V step down converter (e.g. here)
  • 1 x Speaker (I disassembled this cheap Bluetooth speaker)
  • 1 x Push button
  • 1 x USB B socket
  • 2 x 47uF capacitors
  • 1 x 100pf capacitor
  • 3 x bright white LEDs (at least 60° light angle)
  • 3 x 220 Ohm resistors
  • Pinheaders
  • Wires
  • 1 SPI programmer or an Arduino Uno (e.g. here)

For the rest

  • Transparent red filament (e.g. this one). You can use other colours for the rest of the minion, but it is not really necessary, since it will be painted.
  • Four M2x10, two M2X6 and two M2X8 screws (I used DIN84)
  • Eight M2 nuts
  • XTC 3D (e.g. here)
  • Sanding paper
  • Blue and yellow primer
  • dark red, white, silver, brown and black paint

You will have to print every part once, except for "Foot.stl" and "LampLeftAndRight.stl" which you will have to print twice.

*) Depending on the gas you want to detect you can also use a MQ-7 or any other sensor of this product line. The MQ gas detectors use a small heater inside with an electro-chemical sensor, if you would like to find out more about them, check out this link. As you can see in the first image the MQ-2 sensor has a good sensitivity for flammable and combustible gasses [1]. The ordinate shows the resistance ratio of the sensor and the abscissa the concentration of the gases.

I made a minion JPEG camera like you. Kkk You might like my minion.<br><br>https://www.instructables.com/id/Smart-JPEG-Camera-for-Home-Security/<br><br>
<p>This is the best! Great job!</p>
<p>Thanks a lot!</p>
<p>Nifty little project. I love how you've shown the &quot;failures&quot; in your prototyping stage. We all know that not everything works the first time around.</p>
<p>Thank you!</p>

About This Instructable

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Bio: Hi, my name is Britt Michelsen, I'm a Chemical Engineer especially interested in Computational Fluid Dynamics. To balance all the theoretical work I like ... More »
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