Ennostar and Taiwan Asia Semiconductor (TAS, formerly Opto Tech) are developing short-wavelength (over 1,000nm) infrared (IR) LED devices for use in biosensing including heart rates, SpO2, blood ...
[AJ] and [Brian] are making sure the geocache challenges they set up take some ingenuity to solve. They’ve just rolled out a two-part cache which uses a code hidden in infrared light. (Editor’s note ...
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