This is an easy to make laser called the TEA laser that uses parts from around the house or that you can find in local stores. It puts out ultraviolet light, which you can’t see. But if you shine it on white paper or a mark made using a highlighter pen, then it get’s converted to visible light. You can also send it through a liquid containing fluorescein and it will show up. The T.E.A stands for Transverse Electrical discharge at Atmospheric pressure, though it’s sometimes thought of as Transverse Excitation at Atmospheric Pressure.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.
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