Bench Inspection

Bench Inspection


Poster:




Video of our system's operation:


It can be found here:



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Week Two

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  Week Two This Week's Overview: We effectively combined the different blocks of code for each component to create a coherent code that works in unison. We also constructed our first circuit containing most of our components. The completed alarm system was not yet implemented at this point. Flowchart We created a flowchart t o help visualize how the circuit operates and all its different functions. This system takes the inputted sensor values (carbon monoxide (CO), carbon dioxide CO2 and the temperature and humidity sensors) and continuously checks whether the CO and CO2 values are breathable  (9 - 10ppm and 400 - 1000 ppm respectively) . If they are safe to breathe, the system displays the measured sensor values on the screen. However, if the CO or CO2 levels are dangerous to breathe, the system sounds the alarm, opens the "window", by approximately 5cm, using the simulated mechanism comprised of the motor driver and stepping motor, shuts off the fan for quicker gas exch...
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Week Four

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Week Four This Week's Overview: We constructed the "window's" mechanism with our stepping motor and 3D printed gears and actuator. We also created a structure to help demonstrate how our system operates. It is composed of 2 parts: an enclosed box housing our circuit (to indicate that our system is embedded inside the car) and an acrylic box that acts as a gas chamber to help us test our system in a closed environment. Main Tasks: 1) We changed our air quality sensor to another calibrated sensor:  Figure 1: MQ-135 Gas Sensor [1]. This MQ-135 measures the CO2 and other organic compounds that are found in the air. As opposed our old MQ-135 sensor, we were able to measure sensible values because it was pre-calibrated.  We used this equation in the code: CO2 (ppm) = A x (R_s / R_0)^(-B) R_s = ((V_in - V_out) / V_out) / RL where  R_s:  sensor resistance at a certain gas level             R_0:  sensor resistance in clean air ...
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Week Three

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  Week Three This Week's Overview: We constructed the complete circuit and produced a cohesive code that performs the requirements of our gas safety system. Main Tasks: 1) We tackled the issues that arose last week: - Since stepper motors have high accuracies, they can be instructed to rotate to a certain position and easily return to their original position when needed. Therefore, in an attempt to avoid replacing them for another type of motor (servo motor), we changed its full-step sequence to a half-step sequence in the code which made the pace faster: half_step_sequence = [     [1, 0, 0, 0],     [1, 1, 0, 0],     [0, 1, 0, 0],     [0, 1, 1, 0],     [0, 0, 1, 0],     [0, 0, 1, 1],     [0, 0, 0, 1],     [1, 0, 0, 1], ] Additionally, we specified the number of steps it would take to open up the window by 5 cm ( 3200 steps) and the time between each step ( 2 ms) to control the motor's speed: STEPS_PER...
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