I suggest pcbway.com .

Hi keithav,

Yes it is possible. 7. pin seems empty on Sense Hat. Do you have long pin 40pin header?

Also you need 4.7k resistor. This set fit for you.

https://www.adafruit.com/product/381

I suggest use Optocoupler for relay control. Like this way your R.Pi will be isolated from any damage.

I think you need bidirectional voltage level converter. Because your sensor has 5V logic level. RPi pins has 3.3V logic level.

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