I want to use an Adruino with a temperature/humidity sensor and battery in high heat and possibly high humidity environments in the range of 120-170F. The time spent in this range will typically be under 30 mins per exposure.
Is there any kinda of enclosure or insualtion that will allow me to do this and also allow me to expose the sensor? And is there a speical kind of battery that woud work better for this?
Thanks
If you can’t run the sensor itself outside … then a highly insulated box would do it with an ice pack inside .
An authentic Arduino board wouldn't have a problem with that temperature range as long as you don't overload the voltage regulator(s). 18650 lithium ion batteries are rated to 85ºC.
You could try, I think your arduino will be ok with this temp range if powered correctly and only powering th sensor. Insulated enclosure would work great to slow down that exposure temperature, but it would prevent natural cooling of arduino on the other hand.
Overall, I would be more concerned about that humidity sensor, verify temp range of that.
You could possibly pack it in a phase change material such as wax. You will need enough so it keeps it cool for your max time at max temperature. Keep your power dissipation to an absolute minimum. I would bypass the Arduino regulator and power it with an external SEPIC converter, much more efficient then the linear regulator.
What sensor are you considering?
While I think temperature of the board is not much of a problem, humidity likely will be. It will depend on how fast the temperature changes and where the humidity occurs in the thermal cycle.
As for a housing, I would try a "sealed" housing that ebay has a ton of. See here.
You may need a tube from the housing to the room ambient to relieve the pressure in the box. You can use:
P1T1/V1 = P2T2/V2 to estimate the internal pressure.
I would also put a small desiccant pack it there as well. For the External sensor, drill a small hole for each wire required and use solid wire through the wall sealed with RTV.
I was looking at the Seeed Studio XIAO ESP32C3. I want it to be small and also needs BT. What would be the smallest battery I could use that woudn't have a problem with the heat? Thanks
I was looking at Teyleten Robot SHT31-D SHT31, SunFounder DS18B20 to use with Seeed Studio XIAO ESP32C3. If I seal the case and expose a hole for the sensor, will the heat not be an issue? What kind of battery would be suitable? I'm trying to make it as small as possible. Thanks
Hi, @elektrobank
Is there a reason you are going to this trouble when you can purchase a tried and true logging battery powered humidity/temperature sensor?
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom.. 
My suggestion was to have the sensor outside the box with the processor. If you use a SHT31-D SHT31 you will need to protect it from moisture.
Have you considered an NTC resistor. They come in some very rugged configurations.
As for the battery, I've not use batteries at these temperatures. You should use google to find the temperature ranges for different battery types.
I'm looking for one that can handle over 140, most of the ones I've seen top at 120-140, and be able to handle high humidity. I also need it to be bluetooth enabled and offer an SDK to interface with it. Ideally also one that can be whitelabeled. I haven't found one that meets all these requirements, so I looked into prototyping my own. If you know of one, please let me know, I would much rather buy one than build my own. I have built many projects with the arduino before, and am a very experienced developer. I know I can build this myself, I have built many similar projects before, I'm just not sure how to protect it againt heat and moisture.
Thanks
I forgot to mention when fully encapsulated in a phase change material by default moisture etc is sealed out.
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