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The threshold voltage 2-4V means that this FET starts conducting weakly at max. 4V and is fully on at ~10V gate voltage.
You need a logic level FET.
The resistor and led are wrongly connected.
The resistor at drain should be at 5V and the led cathode at drain.
"The MASTER does use a C/S-SS which can interrupt the SLAVE at any time, while other things are going on in the LOOP."
Is that true?
I thought the only thing that SS does, is to connect the slave to the SPI bus.
This was discussed in 2018 at AAC.
It is good you are finally convinced:)
I made in 2018 a test in Oshonsoft simulator and servo interrupt using TIMER1 loaded with servo on time.
The main program ran with 99% speed.
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