A baby phone running on MicroPython. This is currently work in progress.
All baby phones suck, but some are useful! Most baby phones available come with a lot of unnecessary features, unwiedly client devices, heavy power consumption, and insufficient range. This is challenging in most outdoor scenarios, when your kid is just around the corner, but not within earshot. The functionality of the µPhone is as slim as possible to provide reliable baby monitoring in situations when there is no outlet in sight. I try to make the client as slim as possible as well to allow any possible end devices (technically speaking, any device which is able to open network sockets).
I currently use a Pyboard D-series with WiFi and attached a reasonably priced noise sensor to it (Max4466).