Another just-before-bed correction to make on your last schematic
update, where you reacted to this piece of advice:
>> It may be wise to have a series resistance between the Arduino and
>> the SSR's control pin. 250 ohms would be a good value to use here as
>> well.
>
> Updated now.
I might have been too terse in describing what I meant. The 10k pulling
the SSR input to GND should stay, and a 250-ohm resistor should go
between the SSR input and the Arduino pin:
250
UNO_PIN>-----/\/\/\---+----------<SSR_IN
|
+---/\/\/\----<GND
10k
This way, if something goes bad inside the SSR and shorts its input to
ground, or it has a large capacitance, the 250-ohm resistor will limit
the current flowing out of the Uno (the exact same configuration and
reasoning for the MOSFET gate).
Happy 2020!
-B
<snip>
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