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2 - Switch

This part is best understood by watching the video, but if you prefer, here's a breakdown of the steps in written form.

Step 1: Preparing the box​

We'll start by preparing the container that will house the switch, USB-C adapter, and wiring.

  • 1.1 Choose a container: Choose a clean container that matches in size and color according to your preference. We used a small plastic topper/box from a bazar shop found everywhere in Spain.

  • 1.2 Plan the hole layout: You need three holes:

    • Top hole → for the switch
    • Bottom hole → for the USB‑C power adapter
    • Small side/bottom hole → for the pump cable to enter the box

    The switch will sit on top; the box will sit on either side of the sink depending on the child's preference.

  • 1.3 Measure and drill the holes: Select the drill bits according to the sizes of your switch and USB-C adapter. Using a step bit helps. Drill a small hole for the pump cable to pass through.

Result: The USB‑C adapter fits snugly. The switch fits cleanly. The pump cable can enter smoothly.

Choose a clean container that matches your preference
Choose a clean container that matches your preference
Choose a clean container that matches your preferencePlan the hole layout: top for switch, bottom for USB-C, side for pump cableMeasure and drill the holes using appropriate drill bitsAll pieces fit snugly into their holes

Step 2: Install the pieces together​

Now we'll wire the switch, USB-C adapter, and pump cable together inside the box.

  • 2.1 Feed the pump cable: Insert the pump cable through its hole into the box and feed it through the switch hole for soldering.

  • 2.2 Install the USB adapter: Insert the USB adapter into its hole. Use the included front and back pieces and rotate/tighten to lock it in place. Feed its cable through the switch hole as well.

  • 2.3 Prepare the wiring: Open the cable ends and place them into the switch pin holes before soldering.

  • 2.4 Solder the connections: The switch has three pins:

    • Different‑colored pin → Ground
    • Opposite side pin → Power input
    • Middle pin → Switched output

    Connections:

    • USB‑C ground (black) → Ground pin
    • USB‑C positive → Power input pin
    • Pump ground (black) → Ground pin
    • Pump positive → Middle pin (controlled by the switch)

  • 2.5 Insulate the pins: Make sure the soldered pins don't make a short circuit. Use a plier to create more distance between the pins and use electric tape to cover them.

Result: The electric circuit is soldered and fixed. At this point, the switch electrically works if connected to a 5V outlet with a USB-C cable.

Insert the pump cable and feed it through the switch hole
Insert the pump cable and feed it through the switch hole
Insert the pump cable and feed it through the switch holeInsert the USB adapter and lock it in placeOpen the cable ends and place them into the switch pin holesSolder the connections to the three switch pinsUse a plier and electric tape to prevent short circuits

Step 3: Assemble the box and install on the base​

  • 3.1 Tuck cables: Tuck excess cables inside the box neatly.
  • 3.2 Insert the switch: Insert the switch into its hole.
  • 3.3 Close and mount: Close the box and assemble it to the base using screws and 2 additional holes drilled on either side of the base.

Result: The switch box is complete and ready to use with the Piqpoc sink.

Drill holes on the cover of the box
Drill holes on the cover of the box
Drill holes on the cover of the boxMark the drill points on the baseDrill the holesFix the top cover to the baseFit the box