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Ever wanted to 'see' WiFi? With just an LED and a diode you can! When I read this blog post I had to build one. I already had some red LEDs, but I had to buy the special diodes. When they arrived, I quickly soldered them together, making sure the white band on the diode is opposite the flat on the LED. It worked really well. It's a very short range detector and will completely stop working if it's…
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