Worries about oil and gas hog the airwaves. But copper is also essential to keep the world running: It threads through your house, your computer, your eco-correct hybrid car. And it’s getting just as difficult, expensive, and environmentally menacing as oil to extract. We have entered the era of tough ore.
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.
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This is a cool machine! It’s a Sandvik DS310 Bolter; it keeps the drifts from caving in. Made in Lyon, France. It drills a 32mm hole 2m deep, into the ribs and back (minespeak for walls and ceiling; originally from working in the belly of the beast). Then it injects fast acting epoxy resin into the hole, jams a in rock bolt & torques it. Cycle time is about 90seconds, including the time required for the epoxy to firm up. Depending on ground conditions each bolt can have a pull out capacity of 50 tons.
It’s a scary feeling when they start popping out!