Seeing like a bike


Gas sensors calibration

Material used:

  • Wine preserver gas + vacuum bag
    • Baseline calibration

As we mentioned in our previous blog, our first try to calibrate the gas sensors was using helium balloons and it did not work. It took a while for us to get the material we needed to do the calibration but now we are finally done with this process and we are ready to move on.

Gas sensors calibration process : N2O, CO, O3
Gas Sensors base line values 
After putting the wine preserver gas which consist of Nitrogen dioxide (N2O), Argon (R), and Carbon Dioxide (CO2), into the vacuum bag, the gas sensors gradually responded and they are the base line values. The following graph illustrates these values.

Gas sensors base values.

          A new 3D-printed case

We made a stronger  3D-printed case. Our previous version of this case was made of      ABS plastic which is a low quality material for our our case needs. Now, our  new case id made of Uv cure resin plastic which is much better than the previous one. Our new 3D-printed case is stronger, soft, and manageable.

3D-printed case.

         Our system broke

 On the way to our midterm presentation we dropped off by accident the box that goes in the back of the bike. This was the only one box that we have ready to collect data and some of the components inside  were damaged. We were sad because we were not able to show our system working in the presentation, but actually  the dropping  was a good happening since  we were able to detect some weaknessess  in our setting. So, now we are being working on the damages in our system and figure it out how to make it stronger. 


Our goals for week 7th are:

  1. Fix our broken box and build at least 3 more
  2. Collocate sensors at the Atlanta sensing station
  3. have at least three equipped bikes
  4. Get data and pilot data


Cycle Atlanta: Seeing Like a Bike

Goal accomplished. The goals of this week (May 29 – Jun 2) were to understand the project, get familiar with the bike-based sensor platform which was developed by previous students working on this project, and decide how to move forward with this platform.  This bike-based sensor platform consists of four systems; proximity, surface quality, air quality, and gps. During this week, we went through the functionality of all the systems. Additionally. it was important to figure out how to simplify those systems individually, and how to put them together to have a significant improvement of the platform. This way, we have reduced the size of sensing box located in the back of the bike by connecting all the sensors to a single Arduino connected to a single battery, which will power as well the sensing box in the front. By now, one of the previous wooden boxes is used for prototyping and testing purposes, but a completely new case is planned.

Member roles this week.

Erica.      Solder

Noel.       Air quality kit – design and implementation

Javier.    Proximity kit –  design and implementation.

Myeong. Surface quality kit – design and implementation

The images below illustrate part of the work from this week 🙂
Components of the new single back box (left). Assembled components in the wooden box (center). New breadboard which centralizes all the connection in an easier way (right).

Goals for next week: 

Our goals for next week are to implement and test the new proposed architecture of the platform, design the new box for the aggregated kit of the proximity and air quality systems, and, have the GPS and surface quality kit working together in the sensing box situated in the front of the bike. Additionally, a new model of PM2.5 sensor may require a completely new implementation than the existing one designed for a different model.

Work distribution for next week:

Erica.  GPS implementation

Noel.   Design of the box for the implementation of the proximity and air quality systems

Javier. Proximity kit

Myeong.  Surface quality kit

Diagrams of the new connections. PM2.5 sensor is still missing (top). New integrated back sensing box (bottom left). New breadboard for connections linked to Arduino UNO (bottom right).


We are a happy team!

Written by Erica Pantoja