Any home improvement that can be treated as a DIY will be included in this section. DIY can also be very useful!

How to remove moisture from your home: Part 2 of 2 - Extractor fan

Ventilation hole and probe finish
The automatic ventilation system finished and working

As we indicated in the previous post, in this one we will talk about the positioning of the extractor and details to be taken into account for the system to work properly.

It is possible to extract moisture directly by placing an opening to the outside in the lowest part and placing the fan directly (the coldest and most humid air tends to be in the lower part of the room), but in my case, being a ground floor in contact with the mountainside, I had to bring the humid air from below to the top, so I used 90 mm diameter PVC pipe, with a fan connected to it in the lower part.


How to remove damp from your home or premises: Part 1 of 2 - Arduino

Moisture extraction tube and external sensor

In this tutorial we will explain how to dehumidify a room in two steps; first we will detail the preparation and programming of the Arduino board. with which, by means of a relay and two inexpensive DHT11 sensors, we will control a small fan that will do all the work, checking temperatures and humidity. Then, in a second entry, we'll get our hands dirty by drilling holes in the wall and placing a PVC pipe with the fan connected to the Arduino. to extract the colder and more humid air from the lower part of the room, as well as placing the humidity sensors and the box with the Arduino, power supply, etc. I hope you enjoy reading it as much as I have enjoyed installing it; it has been a success; the humidity in a storage room that is in contact with the ground has dropped in one day from 90% to 70% saturation (while in the street there was a 65%).

Introduction and preparations


Build your own decorative homemade multi-focus LED lamp

LED lamp
Multi-focus homemade LED lamp

With LED technology becoming cheaper, as we saw earlier when we built a practical LED lantern and transformed an old lantern into an LED lantern, and lamps becoming more affordable, we can build a homemade energy-saving multi-focus LED lamp with very little money, around 30€.. And safe, as it will work at 12V. To do this we will recycle an old transformer used in 12V halogen lamps, but any transformer will do. to convert from mains voltage (in my case 220/240V) to 12V AC. (alternating current, but also DC direct current).

 ATTENTIONAlthough this handicraft is safe as it works with 12V, great care must be taken when connecting the transformer to the mains.observe proper safety precautions (insulated tool, gloves, or remove the light and use a torch in this task are some options) to avoid receiving an electric shock.


A handmade knife, learn how to make it yourself

Finished handmade knife

Man has always been passionate about swords and knives for centuries, which is why in the ComoHacer.eu we want to transfer that time to the present, following the steps we are going to show you, you will be able to create your own handmade knifeWhether as a gift for a friend or for hunting or fishing...

Materials and tools

  • Crossbow or steel plate (of the thickness you want the knife to be).
  • Grinder or radial grinder, with steel cutting disc. (Buy it on eBay)
  • Sanding disc or belt sander. (Buy it on eBay)
  • Drill with metal drill bit. (Buy it on eBay)
  •  A deer antler or hard plastic.
  • Rivets or blind rivet screws.


Incredible, like sleeping kittens fast!

From time to time the Internet leaves us with some amazing user uploads. In the video above we can see how the puts little kittens to sleep very easilyA couple of turns, a few cuddles and these beasts surrender as if by magic.

Do you know this trick, do you know other tricks for different animals?I personally remember one for sleeping little lizards with a massage and a little air blowing.

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