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 😉
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).
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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