Re: Arduino + MCP9600 + thermocouple help needed

"Richard Smith"  wrote in message news:m134smjy0e.fsf@void.com...
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.
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You don't absolutely require a digital storage scope unless you -must- solve the problems you encounter, I've given you some hints, another below. They are less expensive than a lathe or milling machine or electric welder of useful size and won't keep hitting you up for accessories and consumables as those will, except perhaps a non-contact current probe for motor starting current.
As an example the specs on this look adequate for troubleshooting I2C waveforms.
https://www.amazon.com/FNIRSI-1013D-Oscilloscope-Handheld-Bandwidth/dp/B0BB2GTM1J?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A33KEXAIEXH1NV
Models with an individual knobs to change each function are much more convenient to operate, multistep touchscreen menus are tolerable for limited use but distracting when you are concentrating on a problem, watching the waveform for changes. This is mine, which has the knobs it needs most and handles the less used functions in software with the F1-5 buttons, a reasonable compromise.
https://www.amazon.co.uk/OSCILLOSCOPE-50MHZ-1GSPS-72-8705-TENMA/dp/B018CQ6ZCK
I'd rate it good enough for general hobby and troubleshooting, less than fully adequate professionally. The seller had bought it to monitor one function in a test setup and unloaded it at half price when done. I collect test and measurement equipment, usually second-hand at flea markets and auctions or their resellers.
The tag on that MCP photo gives the I2C address as 66 or 67. Those are hexadecimal numbers, base 16 instead of 10, that handily represent blocks of 4 bits in more human readable form. 66 is 110 0110. The bit weights are 8 4 2 1 and the hex value is the sum of those that are 1, 4 + 2. A-F represent 10-15. Sometimes they are prefixed with 0x  or such to indicate hex instead of decimal.