The W1701 is a cheap thermostat that's designed as a "set-and-forget" temperature controller.

At a price of $2.22 it's more expensive than the W1209 ($1.41), and only a bit cheaper than the surprisingly well designed W1401 ($2.48).

The module comes without operating instructions - but that isn't the point - I wanted to find out if it can be used as cheap programmable control device. Of course it can be used (here are the details - if anybody needs code, please let me know), but it lacks the versatility of its more generously designed siblings, even if it's more expensive, and looks like it could be produced for less than $1. It's needless to say that it should never be used for high voltage.

The W1701 is an ugly duckling that won't turn into a swan. I consider it a collector's item.

EDIT: I just closed the "enhancement" issue on GitHub for W1701 board support with "won't fix". However, I also published some Forth code, and a W1701 SWIMCOM binary with initialization, OUT!, and DIP. For collectors, or for those who really need a board that can be configured with DIP switches.