Happy Halloween! Here's my Halloween project this year:
It's a mini monster box and it works like this:
A microphone circuit detects sound and triggers the monster if you knock on the box. When it triggers, it will open the lid, keep the lid open for a short time, then close the lid again. Inside the box, there's a tiny monster peeping out.
I'm using random values for the open/stay/close times to keep it interesting.
I could (definitely!) have used more time on the appearance of the monster and the box itself, but it was good enough for my 2-year-old daughter, so it's good enough for me 😉
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​The electronics
The project has a sound trigger circuit, an Arduino micro, and a servo.
The most fun part for me was figuring out the sound trigger circuit. I've looked into microphone circuits before but never built one. So it was a great feeling when I built my first version and got it to work!
I considered skipping the Arduino and using 555 timers for controlling the servo. But it would have been a lot of components. And I used 555 timers for a servo for last year's Halloween project, so I had already "been there, done that".
Did you do any Halloween projects this year? I would love to hear about it (you can reply directly to this email).
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Keep On Soldering!
Oyvind @ build-electronic-circuits.com
PS! Are you into electronics and need some guidance to get to the level you want to be - here are two ways I can help you get better at electronics:
- ​​Join Ohmify​: Ohmify is for people interested in electronics who want to learn skills like PCB design, soldering, microcontrollers, and project-building - while also getting a proper understanding of the basics.
​ - Get the eBook ​Fun Circuit Experiments with Sound and Light​ where you'll learn basic electronics through experiments. If you're new to electronics, this is the perfect place to start. The book comes bundled with a component kit for an easy beginning of your journey.
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