hackster.io
In short: Hackster.io (hackster.io) accepts discoverable technical project tutorial. It is free to submit, takes real preparation and a written pitch, and scores 63/100 on our impact ranking (useful).
Publish a detailed hardware or IoT project that genuinely uses your tool, with code, parts, instructions and an external tutorial link where useful.
Hardware-specific; sales pitches and non-project blog posts are prohibited, and discoverable projects must be complete.
Priority is medium, which sets the band. It is free and involved to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.