I see that there's a tiny 20x20 fan in these modules. Do these make audible noise or are the fans in these running rather slowly just to have air movement "better than convection" through the sensor?
The person who did the original hack on these says they are audible and the controller is constantly switching the fan on and off so they reconnected it to 3.3v all the time. So it runs at a lower speed and constantly.
