My friend has sensitive skin and high humidity makes life difficult for her. I want to make a necklace for her which changes color depending how humid the air around is.Ive made my fair share of electronic projects using mostly arduinos and RPis so the concept isnt challenging, however fitting it in the form factor suitable for jewellery is something I just cannot imagine how to accomplish.Im thinking of using an attiny85 based board, a RGB LED module, an SI7021 Temperature and humidity sensor and power using a CR3032 Coin cell. I will hopefully get a large enough pendent online in which I'll be packing all of it.There are a few points of concern:Since all of the components are so close together, would the heat generated affect temperature readings?Is there any other microcontroller that is more suited to this project?How long can the coincell last in this setup? via /r/DIY https://ift.tt/2MZ1yIq
