Introduction: How to Code "A Hiker's Scrapbook"

Picture of How to Code "A Hiker's Scrapbook"

People tend to be nostalgic about hobbies that are important to them, such as hiking.

But how do you keep memory of a hike?

Pictures are an option, yes. This device would allow another option to be data archives from the trip. The person would have a graph plotting the time the hike took compared to the altitude they hiked. In addition, it would tell them the max, min, and average pressure they were exposed to throughout the length of the hike.

This uses Internet of Things Altitude and Pressure sensor to monitor and record data about the hike. MATLAB is then used to analyzed the data to output key pressure readings and a graph of time vs. altitude.

Step 1: Parts and Materials

Picture of Parts and Materials

Sparkfun ESP8266

Compatible altitude/pressure sensor

Wires

USB to micro-USB cable

ThingSpeak account

Arduino software

MATLAB software and ThingSpeak tool box

Step 2: Setting Up Software

Create an account

Create a "New Channel"

Label Field 1 as Altitude and Field 2 as Pressure

Save channel

Go to "Sharing" and select "Share channel view with everyone"

Paste code from [https://ef.engr.utk.edu/ef230-2017-08/projects/ard...] into Arduino

Change WiFi network "ssid" and password

Change "streamID" and "privateKey" to match API Keys on ThingSpeak

Step 3: Setting Up Hardware

Picture of Setting Up Hardware

Wire hardware according to the above picture

Plug USB into laptop and ESP8266

Step 4: Connecting to Your Device

Look for and flip the small, black switch on the ESP8266 to turn on

Click the right-facing arrow at the upper left corner of Arduino program to upload code (this may take a few minutes)

Now the sensor readings should be outputting data to the ThingSpeak website, which is represented graphically

Step 5: MATLAB Coding

Copy the following code for the function "microcontroller_project" into MATLAB

Alter the bold text to fit the specific ThingSpeak channel

(The "90" in bold refers to the minutes worth of data taken into account from the channel. Change this manually according to how long the channel has been running.)

Call the function by typing "microcontroller_project" into the Command Window

Code:

function [graph Pressures_Pa] = microcontroller_project ()
data = thingSpeakRead(364102,'Fields',[1,2],'NumMinutes',90,'OutputFormat','table');

readChannelID=364102;

readAPIKey='U9AJ9S68KVNYQKQV';

altitudefieldID=1;

pressurefieldID=2;

writeChannelID=364102;

writeAPIKey='6H8W3UNH6HMT1TCZ';

for i=1:max(size(data))

timestamp=data(i,1);

time_cell_array=table2cell(timestamp);

time_string_array=datestr(time_cell_array{1,1});

hour=str2num(time_string_array(13:14));

minute=str2num(time_string_array(16:17));

second=str2num(time_string_array(19:20));

time(i)=3600.*hour+60.*minute+second;

end

alt=data(:,2);

alt2=table2cell(alt);

altitude=transpose(cell2mat(alt2));

p=data(:,3);

pressure=cell2mat(table2cell(p));

plot(time,altitude)

title('Hiking Trail Data: Time vs. Altitude')

xlabel('Time (sec)')

ylabel('Altitude (ft)')

str=date; legend(str)

Pressures_Pa.max=max(pressure)

Pressures_Pa.min=min(pressure)

Pressures_Pa.avg=mean(pressure)

end

Comments

inconceivable1 (author)2017-11-17

cool

Swansong (author)2017-11-17

That's a neat way to keep a record of your hikes :)

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