Results 3 issues of Douglas Hall

Have you given any thought to implementing a frequency demodulator that doesn't require atan2? The trigonometric calculations can be avoided by calculating the time-derivative of atan(imag(i)/real(i)): ![png](https://cloud.githubusercontent.com/assets/79724/12060593/8cdf7f66-af30-11e5-8971-8669137f877c.png) Which simplifies out...

Is there any particular reason the Timeout field in webauthn.Config isn't a time.Duration?

I believe this should be `DEPLOY_PROBE` rather than `STOW_PROBE` https://github.com/Turge08/print_area_bed_mesh/blob/53451c9dedd331c2ead0fbd0f55ee15c37d41b1f/print_area_bed_mesh.cfg#L151C13-L151C23