VALAR WH1: Smart Window Opener (Kit)
VALAR WH1: Smart Window Opener (Kit)
VALAR WH1: Smart Window Opener (Kit)
VALAR WH1: Smart Window Opener (Kit)
VALAR WH1: Smart Window Opener (Kit)

VALAR WH1: Smart Window Opener (Kit)

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Model-H: Automated Horizontal Window Opener

The Model-H is a smart window opener that uses HTTP requests to open and close your windows. Combine it with Node-RED, Home Assistant, or any other system capable of sending HTTP requests and get your window to open and close automatically.

This kit includes everything necessary to build the window opener. You will have to build it before it can be used.

Included with every Model-H Kit:

3D-printed parts (optional purchase)

  • Motor housing
  • Motor cover
  • Sill mount base bottom
  • Sill mount base top
  • Sill mount base vertical
  • Lead screw end
  • Window mount
  • 3x cover
  • 2x cover holders
  • Cover end cap


  • Pre-Programmed electronics assembly
  • 2x Hall-effect limit switches


  • 1x 12V 3A AC/DC wall adapter with 6ft cable
  • 1x 10ft power cable extension
  • 1x Long PCB to limit switch cable
  • 1x Short PCB to limit switch Cable


  • 1x 15" aluminum extrusion with pre-drilled holes
  • 1x NEMA 17 60mm stepper motor
  • 1x 400mm lead screw
  • 1x Delrin lead screw nut
  • 1x 5mm to 8mm coupling
  • 1x Mini magnet
  • 1x Magnet set screw
  • 1x M8 bearing
  • 3x M3 square nuts
  • 4x #2 sensor nuts
  • 4x #2 sensor screws
  • 4x PCB plastic screws
  • 2x M3 x 25mm screw
  • 5x Metal screws
  • 1x M3 x 8mm screw
  • 1x M3 x 10mm screw


  • 2mm Allen wrench
  • 2.5mm Allen wrench

You can find full assembly instructions on our Github.

To complete the assembly, you’ll need:

  • A Phillips head screwdriver (#1 or similar size)
  • Wire stripper

Use cases

While you can use Alexa, Google, or other voice control, home automation is where this device shines.

1. Use an indoor air quality sensor (like an Awair) to trigger the window to air out the room
2. Check Purple Air sensors hourly and close your windows when bad outdoor air is detected
2. Measure indoor and outdoor temperatures and cool your room when necessary
3. Check weather APIs if it's raining to open/close your window
4. Set a schedule to listen to the morning birds chirp

How it works

This video has the top cover removed to help you see it better.

![window opener top](/media/top-gif.gif)

The Model-H uses a NEMA 17 stepper motor that is connected to a lead screw. A custom PCB with ESP32 and TMC2209 drives the motor. Two hall effect limit switches on each end stop the motor when it reaches the end.

Safety features

Safety is the primary concern with this device.

In case of emergencies, the entire device can be instantly removed from your window. (see GIF above)

In case an object or limb gets in the way during window operations, the device will automatically stop and save its location.

In the event that you leave the window locked, the device will automatically detect a locked window and stop the motor.

Will it work on your window?

Before you get too excited and buy/build this, please be sure it will work on your window. The height of your window sill is the primary factor to consider.

Is your window sill the correct height?

The maximum distance from the top of the window frame to the sill is 2 inches (Red text in the image above). Any more than 2 inches and you will need to raise the window opener. One solution is to use a piece of wood such as a 1x4 or 2x4 in order to elevate the entire device.

In order to properly attach the window mount (the white piece in the above photo), your window needs 14mm of the lower sash of the window to be exposed.

Is your window wide enough?

The device is just under 22" from end to end. Which means your window needs to be at least 44" wide. Also, add in 2 inches to be safe. So your window needs to be 46" wide from end to end.


Is your window too heavy?

The motor has been tested to move up to 40 lbs. However, this is extremely heavy and may cause problems. If your window is this heavy, lubricate it with dry silicone spray and check if that helps.

How to build it

To decrease your price, you can 3D print the parts in the "hardware" folder on our GitHub page. If you do not have a 3D printer, you may purchase a kit with 3D printed parts.

How to 3D print it

Your window might open from the left to the right, or it might open from the right to the left.

The only version available is the ability to open from right to left. The other version will be added later.

Go to this page to learn more

How to install it

Installation is super easy. The total install time is just a few minutes. Attach 2 mounts, wait 24 hours for the adhesives to build some strength, and start using.

There are 2 mounts that are attached with adhesive. If necessary, you can also use a screw into the sill, but that has been required.

First, attach the window mount.

Next, attach the sill mount.

Wait 24 hours for the adhesives to set and you can now use the window opener.

Sending commands

Commands are sent via HTTP requests

Follow the instructions outlined in the firmware folder.

Node-RED workflow

Use Node-RED in Home Assistant to automate everything. Click the image below to watch a YouTube video on how it works.