Developing wearable gear for hazardous gas detection using PIC preprocessing and modular sensors kits
Using an ESP01 unit programmed by an arduino sketch to auto log in to the wifi I got the ESP to publish a webpage in Chrome on the android phone that triggers an alert when the gas sensor (LPG) signal goes logic low.
All wearable running off a phone power bank. Everything boots up in about 10 seconds.
I like the webpage approach as it means anyone on the wifi can be in the loop with a simple link.
A custom app to do graphing/gps and data logging etc. is being looked at.
This looks very useful as an RF tool: