Let's start by putting together our CLUE Milk Freshness Checker. The CLUE and SGP-30 are the key parts. For the other items, we used some things that can hopefully be found laying around the house. If not, feel free to substitute for whatever is available to achieve the same general arrangement.

  • CLUE board
  • SGP-30 sensor
  • Battery
  • Stemma QT cable
  • Popsicle stick
  • Double sided tape
  • Rubber band

Put a piece of double sided tape about the same size as the SGP-30 at one end of the popsicle stick.

Place the SGP-30 firmly onto the double sided tape and attach the Stemma QT cable.

Use the rubber band to secure the CLUE and battery to the other end of the popsicle stick.

Plug in the Stemma QT cable and battery.

Do NOT let the SGP-30 touch the milk. It is not a moisture proof sensor.

Now move on to setting up the CLUE for CircuitPython usage and loading the code. It comes with some preset values we determined in our testing. We'll cover how you can alter these later.

This guide was first published on Mar 03, 2021. It was last updated on May 24, 2024.

This page (Build the Checker) was last updated on Mar 08, 2024.

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