Brenda Armour10/10/2016 at 22:36 0 comments

I know I did not make the finals and have licked my wounds :C I am excited over the progress made. I have used node red and Dweet.io to calculate a Dynamic Threshold to determine if a step has been taken and so calculate distance. The video shows I have not yet incorporated this algorithm for distance for the next longitude or latitude. The path jumps all over my province. But the graph to determine if a step has been taken seems accurate. Yes Outside Weather conditions is accurate - Hurricane Matthew came to visit and the winds are brutal.

• ### IBM BlueMix Node Red went down

Brenda Armour10/03/2016 at 11:37 0 comments

So IBM Blue Mix had issues with Red Node all weekend and my app would not connect. I spent Sunday building one from scratch and that would not connect. So time is up. I will continue with this. Guess the apps still are not running this morning:

The project will still continue. One of the challenges will be to test the code which I could not do this weekend. My backup nodes were on the Node Red page. Which I cannot reach. If I click on a route , I receive a message Page Cannot Be Displayed :C

But here is my initial calculations:

R = 6378.1 #Radius of the Earth

brng = 1.57 Math.ATAN(accelY/accelY)

d = Stepper Function

lat2 = math.asin( math.sin(lat1)*math.cos(d/R) + math.cos(lat1)*math.sin(d/R)*math.cos(brng))

lon2 = lon1 + math.atan2(math.sin(brng)*math.sin(d/R)*math.cos(lat1), math.cos(d/R)-math.sin(lat1)*math.sin(lat2))

Convert back to degrees:

lat2 = math.degrees(lat2)

lon2 = math.degrees(lon2)

Stepper Function - Raw Data. I will be using Moving Average for the Threshhold.

(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {const float violence = 1.2;

static BOOL beenhere; BOOL shake = FALSE

if (beenhere) return;

beenhere = TRUE

if (acceleration.x > violence || acceleration.x < (-1* violence)) shake = TRUE;

if (acceleration.y > violence || acceleration.y < (-1* violence)) shake = TRUE;

if (acceleration.z > violence || acceleration.z < (-1* violence)) shake = TRUE;

if (shake) { steps=steps+1;} beenhere = false; }

step = step + 1

So distance would be steps * stride

• ### Dash Board of Things

Brenda Armour10/01/2016 at 15:38 0 comments

Below is my revised Node-Red flow:

My first trial of the Dashboard:

• ### Trigonometry of Tracking

Brenda Armour09/25/2016 at 14:51 0 comments

The sensor tag includes MPU-9250 and a 3-axis gyroscope, 3-axis accerometer and a 3-axis magnetometer. This is sometimes referred to as 9 degrees of freedom. If given the initial latitude and longitude can the sensor with some trigonometry predict the next position ? Can you map a moving animals or human animals without GPS ? Can this system assist humans with indoor navigation ? Such a system is called an Inertial Navigation System or Dead Reckoning. A great source of information can be found on Wikipedia.

There are two variables in the algorithm. The first one is easy. We want to calculate bearing or the direction the animal is moving in. The second variable is more tricky. We need to calculate if a step has been taken in order to determine distance.

1. Determine Bearing from the Magnetometer

Here's a screenshot from my Blackberry showing the current position of my location.:

So to use the magnetometer from the sensor tag for bearing , I am using the calculation ATAN2 (Y,X).

Here's my calculation of bearing in Node Red:

If I convert the readings back to degrees than I receive : -63.772673.

2. Calculate Distance

I have used two white papers to try and determine when a step has been taken and then calculate distance .

http://www.eecg.utoronto.ca/~johns/nobots/theses/pdf/2014_hao_yan_masc.pdf

My Node Red Flow needs to adjust the threshold to a moving average rather than a static number.

• ### Hardware and Software for the Tracker

Brenda Armour09/23/2016 at 17:58 0 comments

I am using IBM Bluemix , CC2650 Sensor Tag and Raspberry Pi 3 to deploy motion data to the IBM Cloud. I will be using Node Red to wire the data and calculate next Longitude and Latitude based on Motion data . I will also need to predict when a step has been taken for distance. Below is a nice visualization of the motion data from the Sensor Tag. I'm moving the sensor tag around for this demo.

I have installed iot-sensor-tag from Git Hub. Information can be found here. This code is licensed under Apache v2. I'm using the newest Sensor Tag and the Raspberry Pi 3 rather than a Beagle Bone. The program allows me to connect to IBM BlueMix.

My initial Node Red setup looks like this:

The Trigger ISS Distance Check is a flow available from the node red library and triggers a msg payload to tell you how far you from the International Space Station from your current location. It also is a great learning tool for using Math functions in Node Red. You can find the flow here. The rest of the setup is my work. I kept nodes with different calculations for testing. The debug tabs are used to check the output and also check for errors in the flow.

I will be using FreeBoard's Thingproxy to create a data source for the FreeBoard dashboard and map the output on Google Maps. More information on Thingproxy can be found here. The license info can be found here.

I recently upgraded to Raspberry Pi 3 and now I don't need a WIFI or Bluetooth dongle. I had no issues with the new Pi and was impressed with the speed. The only dongle I have installed is for my wireless mouse and keyboard. The Sensor Tag had no problems connecting to the onboard bluetooth.

You can find details of the sensor tag here. The Raspberry Pi 3 details can be found here.

My next log will explain more of the math behind the calculations and the Dashboard.