A simple 4X4 matrix keyboard is connected to a ESP8266 NodeMCU development board. Had both the components lieing around and collecting dust so decided to throw them together in this project. Thats ...
// Convert time to distance in centimeters (speed of sound ≈ 0.034 cm/us, half for to-and-fro) ...
Abstract: This paper presents the design and fabrication of a microstrip 4x4 Butler Matrix beamforming network operating at 2.59GHz for 5G Applications. The design is implemented on an FR-4 epoxy ...
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