StickNFind sensors are the size of a thick US quarter and cost $50 for a pack of two. Put them on whatever it is you want to keep track of and monitor/find them with your smart phone’s Radar Screen App; You can set an alarm to trigger when a distance boundary is exceeded. Because the app works on signal strength, it can’t immediately tell you the direction of your tagged belonging, but walking about will tell you the direction that increases the signal strength. The range is 100 feet. via SmartPlanet.
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, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, 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.
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