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2

SPI and I2C aren't really the same at all, except at a trivial level in that they're both serial and use a separate clock to transfer one bit per clock (and that's not even truly the case with SPI, which can be wider than 1 bit: 2, 4 and 8-bit wide versions are available.) Beyond this, how are I2C and SPI different? As a protocol, I2C requires more ...


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ESP32 between UART 1, speed 19200 at 20 metres of CAT5E - worked first time. This is actually 3.3V MicroPython 1.15: from machine import UART cuart = UART(1,19200) cuart.write("ABC") other end from machine import UART cuart = UART(1,19200) cuart.read() b'ABC' I was pleasantly surprised!


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It depends on how you feed the antennas and how your transmitter is made. If you have a single TX feeding two antennas, this can be done only with a power combiner, so sending 50% of the power to each antenna (and loss in the combiner!) Instead, with a specific TX for each antenna, what you say can happen: you can feed as much 23 dBm "streams" as ...


1

To overcome those problems, you should start to think about using isolated transceiver. Additionally you would need few RS485 repeaters, because a tiny 485 transceiver can't drive 100 devices at once. By the way, you don't connect the PE directly on transceiver, it's just for the ESD protection potential. If integrated into IC then yes, you connect it to GND ...


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In SPI, MASTER and Slave are actually connected in a loop to the FIFO buffers. As shown in the picture. Try flushing these data buffers and shift registers before each data frame transfer. On both master and slave controllers. (Image source: Electronics Hub - Basics of Serial Peripheral Interface (SPI))


5

This part is an old telephone "receiver" having so-called "butterstamp" shape. Image from Wikipedia. It's the same "tower with two small legs" as on the manhole cover and on the old logo and it's actually a mostly wooden part which is held next to user's ear when the user is speaking on the telephone. The "receiver" ...


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Essentially, provided that the Schmitt triggers don’t overload the USB lines you should be ok. Whether that’s achievable depends on the configuration of your circuit.


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