This is a 28 pin DIP adapter with SOIC(W) on one side and TSSOP on the other. Each side has a ground plane and each pin can be attached to it with a solder jumper.
This is a dual positive power supply PCB, designed by M. Simon of Space-Time Productions. More information, including a schematic and parts list is available at the author's webpage.
HeaterMeter is a system for hands-off monitoring or control of BBQ smokers and grills in both standalone and Raspberry Pi integrated web-based automation.HeaterMeter is open source hardware! Documentation, schematics, and more are available at https://github.com/CapnBry/HeaterMeter/wiki/HeaterMeter-4.0-Hardware