Re: Arduino + MCP9600 + thermocouple help needed

"Jim Wilkins" <muratlanne@gmail.com> writes:

"Richard Smith"  wrote in message news:m1ttl3qahq.fsf@void.com...
>

"Second picture is where commented-out "pinMode(2,
INPUT_PULLUP);". Initially LED lighting randomly when button not
pressed. Then added in the circuit the "pull-up" resistor connected to
on-board supply voltage and the circuit behaved like the first
circuit."

>
Unconnected inputs are sensitive antennas that pick up secret messages
from space, or noise from fluorescent lights and radio/TV
transmitters. Some even float to a middle level where they partly turn
on both the input high and input low circuits, causing oscillation or
higher power consumption. They are all best made high or low if not
used. When you have an oscilloscope touch the probe to your finger and
see how much electric noise you carry around.
>
The traditional initiation rite into electronics is releasing the
magic smoke. Hopefully it's one-time, like forgetting to lower your
helmet
https://www.ntnoa.org/LucasSmoke.htm

I know of the demonstrable proof that electric circuits run on smoke,
and the smoke must be retained just like a boiler holds steam.

It is a bit of a thought that I would need an oscilloscope to proceed
much further.
I have seen videos of them used to diagnose even what is happening when
you push a push-button - all sorts of noise!  With the oscilloscope
showing very clearly.