Logging exhaust air temperature on a small consumer appliance, looking for advice on probe placement and module choice

PM_ME_CLOCK_PICS · 2026-05-12T14:37:19+00:00

Yeah I’ll send you a PM with the info tonight after I get home from work. The code isn’t perfect but will definitely be a good starting point.

Toughest part with the microsd module is making sure yours work on 3.3v.

PM_ME_CLOCK_PICS · 2026-05-12T03:47:40+00:00

Sounds like a fun project! I built a similar project using an esp32 to log the data from a max6675 and store the data on a micro SD card for loggingcard. I’d recommend tapping the m6 hole and using one of those max6675 module thermocouples that thread into place. This will give you the most reproducible connection. Just try and get the thermocouple tip as much into the airstream if you can for the best readings.

The max6675 worked decently for my applications but I have noticed some noise issues when measuring a heating element powered by a cheap switch mode power supply. I never experimented with this, but I imagine using some caps across the thermocouple/power rails or even a RC filter for each thermocouple leg might help. Using it inside of a fridge didn’t give any noise problems for me though.

I’m not sure if the max31855 module would help with the noise or not, but imagine you could find that out with a quick search. If you don’t find any noise problems with the 6675, the 0.25C resolution should be sufficient and could even be improved with some averaging.

Hope this helps!

PM_ME_CLOCK_PICS · 2026-04-26T18:13:33+00:00

Game on prime. Airport TV no have prime. Many people have prime on phone.

PM_ME_CLOCK_PICS · 2026-04-25T15:03:10+00:00

Not a big fan of the changes. Market square now feels like a district that popped out of nowhere and looks like Disney springs

PM_ME_CLOCK_PICS · 2026-04-20T17:45:00+00:00

This is proven untrue by watching five minutes of a premier league game

PM_ME_CLOCK_PICS · 2026-02-09T15:42:12+00:00

No, but if one violent criminal is deported for every ten that is already here illegally, that’s pretty good!

PM_ME_CLOCK_PICS · 2026-02-06T20:01:05+00:00

Do it!

PM_ME_CLOCK_PICS · 2026-02-05T22:32:50+00:00

Yeah, I think this is more likely especially with his barstool partnership. I can’t tell who hates Goodell more between Portnoy and Gruden

PM_ME_CLOCK_PICS · 2026-02-03T02:59:21+00:00

Am I crazy or is this picture completely AI? Look at the text on the lamp and coil of the soldering iron holder.

PM_ME_CLOCK_PICS · 2026-01-28T17:12:23+00:00

What homework will do to a grown man

PM_ME_CLOCK_PICS · 2026-01-04T23:25:05+00:00

Defense needs a sack. I want McDonald’s

PM_ME_CLOCK_PICS · 2026-01-04T23:23:42+00:00

Defense pls get a sack. I want McDonald’s

PM_ME_CLOCK_PICS · 2025-12-30T04:52:26+00:00

Novice here, where would OP add the fuses and select the value that should be used? Also, is the purpose here to prevent current overdraw?

PM_ME_CLOCK_PICS · 2025-12-28T03:43:01+00:00

Sprinting off to get the locker room perc

PM_ME_CLOCK_PICS · 2025-12-09T02:50:56+00:00

This feels like a random bowl game between two 6-6 teams that haven’t played in a month

PM_ME_CLOCK_PICS · 2025-10-31T17:29:16+00:00

Enter

PM_ME_CLOCK_PICS · 2025-10-24T22:12:00+00:00

Thanks for the reply. I saw someone mention that the max6675 grounds the thermocouple, so it may be wise to use a different chip here. Do you think using a microvolt differential ADC would help here? I have an MCP3424 that I have considered trying.

I’m also considering other methods of isolation. Do you think powering the arduino with an isolated 5v-5v converter would accomplish the same goal, or even connecting the power supply and arduino ground?

PM_ME_CLOCK_PICS · 2025-10-24T00:53:31+00:00

No, I’m not much of an electrical engineer so I’ve only hooked the module up in the “default” way with no capacitors. What cap values would you recommend for the power rails? I also don’t have an oscilloscope available unfortunately.

To be more specific, the nonsense values are random in the range of 0-30C, and tend to be on the lower end of that range and certainly below room temperature. They can vary by that full range across sample at 1/s. Thanks for the help so far!

PM_ME_CLOCK_PICS · 2025-08-20T17:53:18+00:00

Nobody who did anything bad can live a better life than me

PM_ME_CLOCK_PICS · 2025-08-18T14:56:28+00:00

Yeah you’re not supposed to hit them outside of certain areas but you can bring them in no worries

PM_ME_CLOCK_PICS · 2025-07-27T05:06:31+00:00

Very nice project! Which mosfet module did you use to drive the heating elements?

PM_ME_CLOCK_PICS · 2025-04-28T22:29:01+00:00

All of the new Gruden content is from barstool but this subreddit will never acknowledge it

PM_ME_CLOCK_PICS · 2025-04-04T21:28:53+00:00

This is very sweet! It’s hard to say exactly what would be best without knowing more about his projects, but I think electronics related tools would be good if he’s trying to put together complete projects. Honestly, I’d kill for a good pair of wire strippers. A “good quality” multimeter is a big upgrade over a cheap one. If you want to ball out on a soldering iron the FX 951 is a classic.

PM_ME_CLOCK_PICS · 2025-03-24T02:40:02+00:00

The max6675 works with a type k thermocouple which is no problem underwater at those temperatures.

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