2 layers76.8 × 94.9 mm

Boards in 1 GitHub repository, designed in KiCad, that use the MQ-3 by HANWEI ELECTRONICS (High Sensitivity to Alcohol and Small Sensitivity to Benzine Sensor). See how each wires it, with its parts, size, README and files; the MQ-3’s symbol, footprint and pinout are on its own page.
