---
layout: presentation
title: FOOBAR --Week N--
description: Accessibility
class: middle, center, inverse
---
background-image: url(img/people.png)
.left-column50[
# Welcome to the Future of Access Technologies
Week N, FOOBAR
{{site.classnum}}, {{site.quarter}}
]
---
name: normal
layout: true
class:
---
# Important Reminder
## This is an important reminder
## Make sure zoom is running and recording!!!
## Make sure captioning is turned on
---
[//]: # (Outline Slide)
# Learning Goals for today
---
# Phone as embedded computer
.right-column60[
Tactile map for the blind
]
.left-column40[
Phone as embedded computer
- Better solution because reprinting a map is faster than making a whole new portable map for each region
- Similar to new interaction techniques, uses conductive plastic
]
---
# Adding in physical computing
.right-column60[
C. Lee, [Intellisplash](https://www.christopherslee.org/home/cadiot#h.pstiqwwsc6zp) water purity tester
]
.left-column40[
Combination of microcontroller, 3d printing, and phone
Uses WiFi, Bluetooth and other communication protocols
]
---
# Other Sensing Adaptations
.right-column60[
]
.left-column40[
[Biotoxicity
sensing](https://www.sciencedirect.com/science/article/pii/S0925400515305992)
Dark box
Phone case
Many similar options -- e.g. [Ph
Meter](https://ieeexplore.ieee.org/abstract/document/6916991);
[Sensing sweat
make-up](https://pubs.rsc.org/en/content/articlehtml/2014/an/c4an01612b);
[Nanosensing by
Nasa](https://www.nasa.gov/centers/ames/news/features/2009/cell_phone_sensors.html)
[more examples](https://www.sciencedirect.com/science/article/pii/S0167779914000572)
]
???
By clicking the “start” button (b) the application runs and several
tabs can be selected (c). The “Procedure” box (d) provide to the
user the instructions to perform the assay, then the Begin button
allow to proceed to the “Checklist” box (e) where preset timers
guide the user through the correct incubation times before BL image
acquisition. The instructions can be also eluded by selecting “Test
sample” in the home page, which jumps the user directly to the
checklist. At the end of the countdown the smartphone camera is
activated and the user can simply touch the “Acquire” button to
capture the BL image of both the test and control wells. (f) The
acquired images are rapidly analyzed on the smartphone and the
sample toxicity result is displayed as “Cell viability” value and a
warning message (Safe, Harmful, Highly toxic). BL image and results
can be also saved for downstream application (i.e. sending results
to a central laboratory).
---
# Printing to enhance a mobile phone
.right-column60[
![:youtube Printed objects whose use can be sensed, W1V2AgDbgTQ]
]
.left-column40[
Printed Analytics: Sensing prosthetic device use
- Uses backscatter technology
- Works in range of a modified wireless router
]
---
# Summary
What does physical computing offer us?
.left-column-half[
New ways to interact
- capacitive sensing facilitate by conductive plastic/thread
- microphone + machine learning
New ways to sense information
- fluid properties
- audio
- backscatter
]
.right-column-half[
New ways to combine devices (e.g. through bluetooth sensing of physical hardware)
Benefits:
- modify a device beyond what the manufacturer expected
- rapid prototyping of novel solutions
]
---
# In-class build exercise…
We will make something blink!!
---
# Preparation
Distribute Arduinos and parts…
If you haven’t downloaded and installed the Arduino IDE, drivers (for Macs only), do that now while we are getting parts distributed. See the AdaFruit website BlueFruit page
If you are on a mac, you will additionally need to install the USB to UART bridge drivers provided by Silabs
By Wednesday you will also need the Bluefruit LE Connect app, and here is the AdaFruit website describing how to install that
Your circuitry kits are from amazon: https://smile.amazon.com/gp/product/B01EROKLBC
---
# Solderless Breadboard
.left-column[
]
.right-column[
Allows you to quickly make electrical connections by pressing wires into holes
]
---
# Solderless Breadboard
.left-column[
]
.right-column[
Allows you to quickly make electrical connections by pressing wires into holes
Central rows of holes are connected like this
```
A1 is connected to
B1, C1, D1, and E1
F1 is connected to
G1, H1, I1 and J1
Etc. for rows 2…63
```
]
---
# Solderless Breadboard
.left-column[
]
.right-column[
Allows you to quickly make electrical connections by pressing wires into holes
Side columns (‘bus’) (typically for power) are connected like this
]
---
# Step 1: Connect Power Bus Sides
.left-column[
]
.right-column[
Connect Red to Red and Blue to Blue at the bottom (using red & black wires from kit)
Double check that it’s Red to Red and Blue to Blue (!)
]
---
# Step 2: Arduino into breadboard
.left-column[
]
.right-column[
Arduino is about in the center of the breadboard (just to the left) at low numbered end, with USB connecter towards the outside (top)
Check: You should see “a b” and “j” at the top and pins in rows 1…16
]
---
# Test
Plug the USB cable between computer and Arduino
Should see a bright blue or green (power) LED
on constantly, indicating we are powered
and red LED should flash once per second
a “blink” test program already loaded (will be replaced)
Side note: Computer should recognize device
May need to install drivers if you haven’t already (Macs). Not necessary today.
---
# Step 2: Power from Arduino
.left-column[
]
.right-column[
For this project, USB is powering Arduino, Arduino is powering the rest of the circuit
Connect Arduino GND pin
]
---
# Step 3a: Power from Arduino
.left-column[
]
.right-column[
For this project, USB is powering Arduino, Arduino is powering the rest of the circuit
Connect Arduino GND pin
Can do this from a4 because breadboard ground pin is plugged into row 4
]
---
# Step 3b: Power from Arduino
.left-column[
]
.right-column[
Now connect Arduino 3V to power using a red wire (A2 to power bus)
At this point, power and ground are connected in both buses. All further wiring will take place in the f-j columns if not specified.
]
---
# Note
This part of the wiring will be used for the rest of your projects in this class, so leave it in place after you are done with this build
---
# What is in your [Kit?](https://www.amazon.com/SunFounder-Electronics-breadboard-Resistor-Raspberry/dp/B07QT78FXF/ref=sr_1_9)
TODO: finalize kit. Considering [seeed](https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html?gclid=CjwKCAjw8-OhBhB5EiwADyoY1a8K4v1cJxiLIgz-Sbs9VeUn85knaTEDPpocYsO-Xt7SOcKo51SkbBoC-I4QAvD_BwE) and which board? [nano 33ble](https://www.amazon.com/Arduino-Nano-33-BLE/dp/B07WV59YTZ?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=AA57DDZKZUZDL) or [nano 33 iot](https://www.amazon.com/Arduino-Nano-33-IoT/dp/B07VW9TSKD?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=AA57DDZKZUZDL)
---
---
# Step 4: Current Limiting Resistors
.left-column[
]
.right-column[
Find 2 220Ω resistors
Unplug Arduino while wiring!
Connect resistors
J9-J19
H24 to ground
[Wikipedia article on color codes](https://en.wikipedia.org/wiki/Electronic_color_code)
]
---
TODO finish this deck from [here](https://drive.google.com/drive/folders/1NA1ajSwodJy6g9jDeMe1QLLflgE9_dnl)