Sensing Color With a LED and Op Amp

Sensing Color With a LED and Op Amp

Robot Room’s David Cook shows how an LED and op amp, along with a resistor and cap, can be built into an amplified color sensor. Unfortunately, even under the best conditions, photodiodes (and reversed LEDs) don’t provide a lot of current flow. The output of the photodiode needs to be... Read more »

By , 2013/05/20 @ 1:00 pm

Categories: Electronics | 2 Comments


Instant Giant Tetrahedron

Instant Giant Tetrahedron

Continuing a Math Mondays tradition of building Sierpinski triangles and tetrahedra out of various materials, today we're going to do it with mailing tubes. The basic unit requires six identical mailing tubes and a piece of cord or twine about 8.5 times as long as the tubes. Read more »

By , 2013/05/20 @ 12:00 pm

Categories: Art & Design, Education | 2 Comments