Temperature Module New Battery and Case

thingiverse

I have a simple internal and remote temperature station with an LCD display by Ascot. My remote temperature sensor is battery powered with two AAA batteries that don't last long, typically less than six weeks, and become ineffective when the battery level drops to about 1.4 volts per cell, especially in colder months. My solution to this problem is to replace the AAA batteries with a single rechargeable 18650 LiPo battery that should last for many months of use. However, the new thermometer and LiPo battery require a new enclosure to protect them from the elements, so I designed a custom 3D printed case. The temperature module has a measured quiescent current of 650 microamps with regular power spikes during temperature signal transmission. To note, a fully charged LiPo battery will have a voltage in excess of four volts, and I included a diode in series with the LiPo to drop the voltage by 0.6 volts. Possible design improvements include: 1. Including a LiPo charging circuit with an external DC charging connector. 2. Improving the case to provide flex support for the front panel. 3. Re-positioning the case side airflow vent to accurately align with the thermometer module. My print is made in PETG 1.75mm Aurarum silver filament with a 0.2mm layer height and 25% infill on a PRUSA I3 MK3S printer.