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enter image description hereI found this post:

Slow rise time for a temperature sensor

enter image description hereI have the same problem. I don't think mine even has a hole for the sensor, which is even more crazy.

Why on earth didn't they go with the original plans that you showed which makes perfect logic?

I will have to drill a new hole for my sensor, but I am not sure which which part is the sensor. I have removed the board hoping you or someone can identify it. If I had to take a guess I would say the black square or the smaller silver square next to it on the right at the top on the blue square chip. It would be hard to use without the case due to the battery's and expect could easily get damaged so this is my only option.

What size holes would your recommend? I am guessing bigger would be better from what you said, but yours didn't look that big. Was the very small hole already there for a reset button or something?

Thanks

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    \$\begingroup\$ You have several references to "you" and "yours" in your post. To whom are you speaking? \$\endgroup\$ Commented Sep 9 at 21:57
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    \$\begingroup\$ Regarding your question, why not probe the board with something warm - your finger perhaps - while monitoring the output. You should be able to find the sensor quite easily. I'd guess it's U5. \$\endgroup\$ Commented Sep 9 at 22:01
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    \$\begingroup\$ The blue "chip" (module) is for communications and the chip you circled almost certainly has nothing to do with sensing the temperature. The other black chip with 16 pins is likely a cheap MCU and they are probably using its internal die temperature sensor. If the chip runs at a low enough duty cycle, this will track ambient temperature closely enough -- and also explains why the time constant is so long. This type of product is not meant to be carried around; it's supposed to sit in one location and report to a control/status center. \$\endgroup\$ Commented Sep 9 at 22:53
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    \$\begingroup\$ A hole will make little difference. There are ways to make an air temperature sensor with rapid response but a device on a pc board with a plastic cover, holed or not, is not it. \$\endgroup\$ Commented Sep 10 at 1:05
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    \$\begingroup\$ Why on earth didn't they go with the original plans that you showed which makes perfect logic? ... is this really the question you want answered? ... please don't be thinking that you are at a chat forum ... this is a question and answer site, so questions are taken as written, not as conversation starters \$\endgroup\$ Commented Sep 10 at 2:05

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The chip that you circled is the SoC/MCU for the Bluetooth communication. Has nothing to do with temperature measurement.

Based on the silkscreen and photo of the PCB. The temperature sensor is the U5 at the bottom. It is a CHT8310.

Drilling a hole might provide better air circulation, but I doubt it will improve the slow change in reading, as it might be by-design that the MCU only take a reading in every one hour to reduce the battery consumption. You can probe the SDA line with a logic analyzer to see how often it wakes up to read the temperature.

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