Module 2 Activity Research

Weekly Activity Template

Abigael De La Rosa

Project 2

Module 2


Workshop 1: Guerrilla Prototyping I

The photos below are from the Phone Stand Guerrilla Prototyping Workshop from Week 7:

The phone stand we built following Maker Brain's tutorial on YouTube: https://www.youtube.com/watch?v=3LgJ7QjEKZs The 'geometry net' of the phone stand laid flat before assembling it Step #2 of the activity where we iterated based off of Maker Brain's tutorial (the phone stand on the right is the original) The back of both phone stands. The main iterations we made included a lip on the front of the stand to prevent the phone from slipping off, and an adjustable height with the use of the 2 arms The final look: what the phone stand looks like while in use/with the phone on it

Workshop 2: Guerrilla Prototyping II

The photos below are of the stuffed animals/plushies we chose from. The group, as a whole, decided on this together, before diverging into 2 separate pairs to work on our own assigned tasks:

The first plushie we considered: a penguin stuffed animal (easy fault lines to dissect and sew, as well as short fur that is ideal for the sensors) The second plushie we considered: a teddy bear (small-sized with short fur, good limb pads, and clothing to hide wires) The third plushie we considered: a bunny stuffed animal (great candidate due to its size, light fabric, long ears that can hold sensors, and can stand on its own) Cutting the teddy bear open Adding a heart patch on each plushie to test and see if users would hold them differently based on their placement and how they look

Activity 1 Research: Testing the Pulse Sensor

Completed with: Emily Revell

Planning out Activity 1 by identifying knowns & unknowns Before we watched coding tutorials, we had to learn first exactly how our pulse sensor worked, as we were completely unfamiliar with it. <br><br> The HW-827 heart rate sensor works by shining a green light onto a thin part of our body, such as a fingertip or earlobe. This light then travels through the skin where some light is absorbed by the blood, and the rest is reflected back. The amount of light bounced back is then measured by measuring the changes in blood volume. We watched multiple different coding tutorials for Arduino so that we can see the data being retrieved (i.e. the BPM) on our computer. <br><br> This is an example of us testing 1 of 3 sketches we found to see if both our wiring and code were correct. Many Arduino sketches that we explored for measuring heart rate using the HW-827 Pulse Sensor utilized similar wiring. In these tutorials, the white wire (Signal) was inserted onto Pin 0; the black wire onto Ground; and the red wire onto the 3.3V power input pin, to activate the sensor. In this sketch, the heartbeat data (in BPM) is abnormally high. This tells us that there might be issues with the code, the sensor, the wirings, or all of them.

Activity 2 Research: Testing the Temperature Sensor

Completed with: Emily Revell

Planning out Activity 2 by identifying knowns & unknowns Attaching the Grove Temperature Sensor V1.2 to our Arduino board Exploring one of the sketches we found online. While we tried our best to fix problems we encountered (such as the Serial Monitor displaying incredibly high temperatures and switching to a different Baud Rate to see if it changes anything), we unfortunately had to look for another sketch that would work. The next sketch we used, based on Seeed Studio's tutorial for the Grove Temp Sensor. This time, we did not encounter any problem, although we did apply some changes (such as the addition of Fahrenheit and increasing the delay). Sketch #3 working successfully. This is where we decide that we will be using this code as we move forward to Project 3.

Additional Research or Workshops

Completed with: Emily Revell

<b>Part of our Activity 1 Research:</b> While we have used Serial Monitor to read sensor data sent from the Arduino Sensor Kit, we also used Serial Plotter to see if it is possible to visualize our data (i.e. the heartbeat signals) and to see if the sketch/code we used worked perfectly. <br><br> In the above graph, the signals looked unstable, with irregular peaks and dips in the graph. Like other sketches we've experimented with for Activity 1, we will need to figure out exactly where the problem is coming from. Discovering a variety of resources through the Seeed Studio Wiki Platform. This page is specifically for the Grove Ecosystem, and our goal is to continue exploring this website for Project 3. Learning how Capacitive Touch works during our Week 9 Workshop The circuitry for Capacitive Touch Watching how the Capacitive Touch works through ProtoPie Connect

Project 2 Prototype

After we finished working on separate activities, all 4 members of our group converged to bring our work together and integrate them into a singular prototype.

Below is our stuffed animal with the Temperature Sensor inside the pocket sewn into its left ear. (The Pulse Sensor was excluded but will be tested again at a later time after we find a solution to our issue.)

On the laptop screen is the data (the temperature values) retrieved from the Arduino.

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