Adafruit will not be shipping USPS orders Monday February 18, 2019 for the federal holiday, Presidents Day.
Expedited USPS orders placed after 11am ET Friday February 15 will go out Tuesday February 19.
When someone opens the door, be the first to know…
Today we set up a door sensor that sends a notification to your phone when the door is opened, no matter where in the world you are. Because we use the Thingsquare system and off-the-shelf hardware we do not need to do any programming or soldering.
The door sensor consists of one Sensortag and one ordinary magnet.
We use the Sensortag hardware with sub-GHz configuration. Unlike many projects using this hardware, we use IPv6 sub-GHz 6lowpan communication instead of Bluetooth.
The Thingsquare system uses 6lowpan instead of Bluetooth for several reasons:
Longer range: 6lowpan’s sub-GHz radio signals travel much farther than Bluetooth’s 2.4 GHz signals – particularly indoors.
Less interference: the 2.4 GHz Bluetooth frequency band is shared with WiFi, which typically is very crowded. Also, 2.4 GHz signals are effectively stopped by the human body, so performance is degraded when there are people around.
Automatic meshing: with 6lowpan, we automatically get the benefits of meshing, which means that we can extend the range of our system indefinitely.
Built-in low-power operation: we can achieve multi-year lifetime on a single coin-cell battery, while taking advantage of all the above benefits.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.