3.7 Lipo battery

I'm trying to make a rechargeable health band/watch which is targeted for sick elderly's whom stay alone at home.

The Plan:

  1. to sense the temperature of the elderly, in which the temperature's will be sent through Blynk IoT, so that their love ones can see their temperature from work or from school.

  2. to sense sudden drops with the DPS310 as that elderly's are commonly very frail and prone to falling or collapsing.

PaulRB:
The DPS310 sensor should be 3.3V compatible, but post a link to the board you want to use before you buy it.

This DPS310 sensor board looks like it might be compatible with Wemos, but I do not think it is, so do not be fooled by its appearance.
s-l300 (34).jpg

It is quite an expensive sensor. Why did you choose it? What is the application? There may be less expensive alternatives, which might even be available as a Wemos shield.