Connected Multi-Purpose Micro:bit Doorbell

myminifactory

Hi everyone! You're fed up with unwanted invasions of your private space? Want to know when someone's about to enter your room on your smartphone? Follow this easy tutorial to create the Shark Multi-purpose Doorbell. It has been programmed with three modes, but you can customize it as much as you like! MODE 1: Motion Recorder This mode records how many times your door has been moved while you're away. This number is displayed when you press buttons A and B at the same time. MODE 2: Doorbell When someone presses one of the two buttons, a ringtone on your smartphone notifies you that you have a visitor! Simply shake your phone to let him know through the screen that he may come in. MODE 3: Alarm You can use this mode to be warned on your smartphone if someone is opening your bedroom door, secret cupboard, or even your fridge! To create the Shark Multi-purpose Doorbell, you'll need: 1. BBC micro:bit 1 coin cell battery (3V) + 1 coin cell holder 1 3D printer + filament Superglue Reusable adhesive Step 1: Print the shark Download the STL file of the shark and the teeth on this page. Next, you'll have to slice the parts. This means generating a code that represents your 3D part, which your printer will be able to understand. This action is called "slicing" because your printer prints layer by layer, and the software needs to calculate the path that the printer's nozzle will follow. Make sure to use the appropriate slicer for your 3D printer; ask your teacher if you need help! Here are the settings for printing the shark: speed at 70 mm/s, 0.2mm layer height, 10% infill, temperature between 200°C and 240°C. Glue the teeth to the shark. Step 2: Flash your Micro:bit The program interacts with your smartphone, so first, download the Micro:bit app on the Play Store. Then pair your device following the instructions of the app. Once it's done, go to this page to download the doorbell program. Click on "Compile" to download the .hex file on your smartphone. Back to the Micro:bit app, connect your device and flash the code that you can now find in the "Flash" section. Your Micro:bit is now ready to communicate with your phone! Step 3: Enjoy! Power the Micro:bit with a battery (you can also use cylindrical batteries; they fit in the case!) and use reusable adhesive to set your doorbell wherever you want. Choose a mode, and free your mind – the shark is here to prevent intruders from disturbing you!