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A comment on 3-D printed plastic objects that can communicate with WiFi devices. Parent comment

Re:3-D printed plastic objects that can communicate with WiF... by TeMPOraL on Wednesday December 06, 2017 @02:15PM (#15863981)
The technique you mention is realized through an FPGA chip. It is not used in the 3D-printed backscatter devices this article is about.
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Re:3-D printed plastic objects that can communicate with WiF... by baldfat on Wednesday December 06, 2017 @05:57PM (#15865943)
Not this is through the Printed 3D Device

From the paper

"We 3D print a cup anemometer as shown in Fig. 2 to measure wind speeds. The entire setup is sufficiently light that even wind speeds as low as 2.3 m/s will cause it to spin. The hub of the anemometer is attached to backscatter gear that encodes an alternating sequence of zero one bits. When the hub spins, the backscatter gear pushes against the spring switch. The switch makes contact with the antenna and generates the backscatter signal. Wind speed can be inferred from the rate at which bit transitions occur."

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