2 layers127 × 117.5 mm

Diy ert
CainPatel/diy-ert
A $150 four-electrode earth resistivity meter (Wenner array): Arduino, AD620, ADS1115. Documented failure-first as an engineering log.
44 parts1MIT
Open-source boards designed in KiCad by CainPatel on GitHub, from 1 repository. A board’s address here is its repository’s there.

CainPatel/diy-ert
A $150 four-electrode earth resistivity meter (Wenner array): Arduino, AD620, ADS1115. Documented failure-first as an engineering log.