A (slightly) modified version of Gangster45671's IFTT Dash Button.
- When constructing the querystring to submit data to remote server, be tolerant of the fact that the configured URL may already have a querystring (i.e. append an "&" if the URL already contains a "?").
- See pull request: IFTTT-Dash-Button/pull/1
- Add another configurable URL to dipatch a "Low battery warning" message when the battery voltage drops below a pre-determined threshold.