You can find a cheap Chinese soil moisture sensor labeled YL-100. But it’s hard to find working instructions on how to use it. This article intends to fill this gap.
Sometimes it may be necessary to use old computers. Linux operating systems are perfect for this task. There are a lot of articles and recommendations on the Internet for selecting software and specific distributions for this task. But there is a key problem: recently all browsers (and some other programs) have ceased to support old processors (most 32-bit).