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 heating steel you may notice changes in color on the material (such as in a picture during the bending of this table leg). The Scale Model EXchange have an interesting color spectrum of the various colors that steel takes on, during the process of heating which forms “an oxide layer…on the surface” as described on their website. The thickness of that oxidation has a direct correlation to color via the light reflected (interference), and thus you get this spectrum:
Temperatures below 800°F (427°C) produce oxidation colours.
Temperatures above 800°F (427°C) produce incandescent colours
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.