Wemos Lolin S3

Lolin-Adafruit I2C cable adapter

The Lolin S3 Mini Pro (and variants) use the same 4-wire connector as Adafruit and Sparkfun (StemmaQT and Qwiic), but the wiring is different.

The wiring on JST SH1.0-4P connector on the Lolin is incompatible with the wiring on STEMMA-QT/Qwiic I2C connectors on Adafruit/Sparkfun stuff, even though it physically fits (I tried and burnt things).

You'll need to fashion one I2C adapter cable out of a Qwiic/StemmaQT cable. Here is how:

Reading material:

• https://learn.adafruit.com/introducing-adafruit-stemma-qt/technical-specs
• https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt
• https://docs.wemos.cc/en/latest/_static/files/sch_d1_mini_pro_v2.0.0.pdf