I don’t remember how I originally stumbled across this, but looking through my ‘Embedded’ bookmarks I was reminded of this interesting and relatively accessible introduction to basic sensors. Rather than focusing on sensors, though (temperature, humidity, etc.), it focuses on something much more interesting … the ways that many sensors actually measure things (via resistance, capacitance, inductance, etc.). If you’re looking for a basic primer of the advantage and disadvantages of different ways of measuring the physical world around us (visible or not), this is as good a starting point as any! Head over to Introduction to Sensors by the University of Exeter for more information.
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.