How To Waterproof a Sensor

We've started working on a weather station project and would like to give you a glimpse into the first step of building it - making your sensors waterproof!


Once a sensor is waterproof you are able to place it anywhere outside and receive real time readings from it. The real treat about this one is that it’s simple and achievable with regular items you find around the house. We’ve put together an easy to follow step by step tutorial. So.. are you ready?


Waterproofing supply list

to waterproof a sensor you'll need


Before we start, here’s what you’ll need in order to make your sensor waterproof:

  • A Kinder Egg
  • A drill
  • A 5mm drill bit
  • A drinking straw
  • A utility knife or scissors
  • A pen
  • A caliper or ruler
  • A hot glue gun

The process

Start by opening your kinder egg. Eat the chocolate and extract the little surprise container.
Next, empty the surprise container.

Sensor waterprooofing step 1


Use a caliper or a ruler to measure a 6 mm gap from the rim of the surprise container.


use a caliper or ruler


Use a pen and then your utility knife to mark the spot and drill a hole at the specified spot. Careful not to hurt yourself!


Drill a hole


Next, take a straw and measure around 15-20 mm from the edge of it. Cut the straw diagonally.


measure 15mm


Take your humidity and temperature sensor and place the straight side of your straw on top of the sensor.


put the straw on the sensor


Secure the straw with hot glue. You can simply place two drops on opposite sides of the straw then go around it to secure it in place.


hot glue the straw in place


Next, insert the straw into the hole as exhibited.


Insert the straw into the surprise container


You may need to make some adjustments to the length of the straw... careful not to cut your fingers.


Trim the straw as needed


Make sure that the sensor's button is facing upwards and that the battery holder is accessible.


position the sensor inside the container


Secure the position of the sensor in the plastic case with the help of hot glue.

Next, apply some hot glue around the straw to make sure the system is well sealed.


hot glue around the straw


Cut off the top of the straw- just to give it a cleaner look.


cut off the extra length of straw


And... you are done!


The sensor should now be waterproof


Now drop the box into a glass of water to test it.


drop the container in water to test


You are able to use the same technique for the Master Module with the help of an old Film canister as well as for the light and proximity sensor with the help of a tic-tac box.


waterproof a light sensor


And this is how you make your sensor waterproof!
Stay tuned for the next steps to create your very own weather station.