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2: you can see the buck converter on the main PCB - it's the component that outputs 3.0 volts.Very nice - it looks so much neater with the custom PCB compared to wires.
I have 2 questions:
1. Any ideas about how to neatly direct the gas to the sensors? Do you use some kind of pipes or ??
2. How do you provide the 3V required by the helium sensor on top of the 3.3 or 5V required by the Lolin board?
Cheers