Ground connection in schematics

ostaquet / Arduino-MQ131-driver

Arduino driver for gas sensor MQ131 (Ozone / O3)

MIT License

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Ground connection in schematics #53

Closed ostaquet closed 2 years ago

ostaquet commented 2 years ago

Hello. Thanks for offering this helpful library. If I connect external (not from Arduino board) 5V to MQ-131 sensor and heater pins, and also connect MQ-131 ground pin to external Ground, will I still need to connect external Ground to Arduino board Ground?

Originally posted by @NXTkoji in https://github.com/ostaquet/Arduino-MQ131-driver/issues/49#issuecomment-1207338083

ostaquet commented 2 years ago

Hi @NXTkoji,

All ground connections (black wires in the schematics) must be connected together. If not, you will not have a difference of electric potential.