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Communicate with 256 nodes over over about 40 meters

By putting an Arduino on each tile you are designing an overcomplicated and expensive solution for a problem that has already been solved more simply and more cheaply. "Individually addressable ...
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Does a receiving antenna radiate the power received?

If the incoming E-M wave can induce a voltage won't it accelerate or decelerate the electrons in the wire and doesn't this acceleration cause further radiation (lets call it secondary radiation) of E-...
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Does a receiving antenna radiate the power received?

If you have a power supply with V volts, connected to a resistor with V volts, is the resistor a power supply? A receiving antenna can be considered to be a negative power supply, just like a resistor,...
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Costas Loop QPSK/4QAM

Thank you Tesla23 for your comments/help. I got the loop working, the graphic in my question works. My error was some incorrect signal conditioning when I was driving the mixers.
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EtherCAT Communication Testing

As noted by @Kartman, EtherCAT at the physical layer is effectively 100MBit ethernet. I have had extensive experience plumbing 100MBit ethernet through robotic systems that operate unsealed in some ...
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I2C high speed mode

One idea: daisy-chained SPI. TI app note Diagram on Wikipedia (SVG file will not embed) All CS and SCK lines are connected in parallel. MOSI/MISO (easier to call them SDI/SDO in this arrangement) are ...
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