How to use this Water Detection Sensor?

Products
1

I just purchased the water detection sensor (sku PR46-14). I’m planning to connect it up to a Raspberry Pi 4 via I2C. I see it also has 2 GPIOs, which I’m planning to wire an on/off switch to. Can someone please point me to the API library compatible with this sensor and instruction on how to read the I/Os (preferably in Node Red)?

2

Hi,

That device utilizes a PCA9536. There will be sample applications available online for that IC specific to your software development language.

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3

Thank you for your answer, I think this is the repo you’re referring to (GitHub - ncd-io/ncd-red-pca9536: PCA9536 Library from ncd.io). How about the wiring for the extra GPIOs? There are 4 unused pins labeled “Pull Up”, I’m assuming I can hook up a switch to them to monitor its status?

4

Hi Brian,

The additional IO lines for the PCA9536 are not exposed via any accessible hardware connections on that product. It was developed only to be a water detection sensor.

Thank you,
Travis Elliott

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