Build an automated dehumidifier sump pump


A perfect project for those too lazy to walk down to the basement to empty their dehumidifier… or who forget to give their in-laws a gift on the holidays. 


This winter, Zachary J. Fields went home to visit his family, but neglected to buy a present for his in-laws for Christmas. After they asked him to go to the basement and empty the dehumidifier, he decided that instead of just doing the task once, he’d make a device that would do it automatically for them.

WP_20151231_13_39_31_Rich_LI (2).jpg

To accomplish this task, he used an Arduino Uno (ATmega328) to control a water pump via a relay. For water sensing, he employed two pairs of bare electrical wire. When each pair of wire is immersed, it conducts electricity from one lead to another. Unfortunately, water is a fairly poor conductor of electricity, so to compensate for this, each signal is amplified by a Darlington transistor pair before it is input into the Arduino.

Arduino-Uno-R3-top-600x600.jpg

Each pair of wire is set up on top of each other (in a nice braided configuration) so that water level can be read as “full” when both sensors are made, and “empty” when both are off. This allows the pump to start at the full level, then cut off when water is below the lower sensor. This is important so that the pump doesn’t suck air for a long time, possibly damaging components and wasting electricity.

If you’re tired of walking down to the basement to empty your dehumidifier, then you’ll probably want to take a look at this project.

One thought on “Build an automated dehumidifier sump pump

  1. captnmike

    what happened to the old two contacts in a plain old magnetic reed switch float switch?? – used to use them a lot – start on the upper switch and stop on the bottom switch – sealed and just a float going up and down on a rod with the switches in it

    Like

    Reply

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s