Final Project: Flappy Hat

Majeed Kazemitabaar, Seokbin Kang | HCIL, University of Maryland
Link to Github


An overview of your mini-project with pictures and embedded YouTube video.

Materials and Parts

A table with estimated costs of your materials and parts and links to the source material at an online store such as,,, etc. The last row should provide the total cost.
Describe the Part's Role In Your Project
Total Cost
Blend Micro
The main brains of our project that interfaces the sensors with our computer and performs some simple on-board signal processing
UV Light Sensor
An easy to use ultraviolet light sensor. This sensor detects 280-390nm light most effectively whenever in front of the sun the values increase substantially and we could use these values to make a shade using the wings.
Humidity Sensor
a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components. We used this part to measure the humidity + temperature.
Wiring, Glues, Fabrics



Making The Wings
The wings needed to be lightweight so that the low-current servo motors would be able to move them. But at the same time we wanted them to look fancy and 3D! That's why we mixed 3D-Printing with Laser-Cutting (which is also faster!)

How we wanted the wings to look like!
The file that we used for laser cutter


Connecting the wings to the servo motor was a big challenge. as this was a wearable device and our head moves a lot, we required a strong connection between the servo motors and the wings. That's why we 3D printed a shaft that was able to be screwed into a servo horn.

Future Work Ideas
- Instead of wings, we could try moving the cap up and down when the user is in front of the sun.
- Although not part of the tangible interactive + reactive wearable theme, it would be a nice idea to push these data with the location GPS data to a web server to make a real-time crowdsourced weather map.