EasySense Android software guide - Data...

EasySense Android

software guide

This manual may be freely copied for use with the EasySense software.

Copyright: all rights reserved.

Data Harvest's policy is to continually improve products and services, so we reserve the right to make changes

without notice. It is acknowledged that there may be errors or omissions in this publication for which

responsibility cannot be assumed. No liability will be accepted for loss or damage resulting from use of

information contained in this manual or from uses as described.

Data Harvest Group Ltd. 1 Eden Court, Leighton Buzzard Bedfordshire LU7 4FY [email protected] www.data-harvest.co.uk

DO254 Issue 2

EasySense Android software DO254 (2)

© Data Harvest Ltd. 2

Contents

Compatibility .......................................................................................................................................................... 2

To connect to a data logger .................................................................................................................................... 3

The logging window ................................................................................................................................................ 4

Recording data ........................................................................................................................................................ 4

New recording ........................................................................................................................................................ 4

Sensors................................................................................................................................................................ 5

Test Mode ........................................................................................................................................................... 5

EasyLog ............................................................................................................................................................... 5

Manual ................................................................................................................................................................ 5

Snapshot ............................................................................................................................................................. 6

Timing ................................................................................................................................................................. 7

Analysing captured data ......................................................................................................................................... 9

Values ................................................................................................................................................................. 9

Interval/ Difference ............................................................................................................................................ 9

Gradient ............................................................................................................................................................ 10

Area .................................................................................................................................................................. 10

Statistics .................................................................................................................................................... 11

Best Fit Line ...................................................................................................................................................... 11

Displaying data ..................................................................................................................................................... 12

Data Value boxes .............................................................................................................................................. 12

The Table display .............................................................................................................................................. 12

Zoom ................................................................................................................................................................. 12

X and Y axis ....................................................................................................................................................... 12

Show/Hide sensor, Autoscale, Sensor settings ................................................................................................. 13

Options: Grid, Overlay, Line thickness, Line or Bar graph, Show Data As ........................................................ 13

Title ................................................................................................................................................................... 14

Changing a sensor’s range .................................................................................................................................... 14

Retrieve ................................................................................................................................................................ 14

Share ..................................................................................................................................................................... 14

File options ........................................................................................................................................................... 15

Open file ........................................................................................................................................................... 15

Delete file ......................................................................................................................................................... 15

Saving files ........................................................................................................................................................ 15

File name .......................................................................................................................................................... 15

EasySense Software Multi-user Site Licence ........................................................................................................ 15

Compatibility

Computer

Model Operating System

Android OS 4.4 or later For Bluetooth device must support Bluetooth Low Energy (BLE)



Data Loggers

Model Product No. Connection

VISION 2020 BLE Requires a Bluetooth Smart USB Adaptor (Product No. 2070)

VISION Wi-Fi 2021 Wi-Fi Built in Wi-Fi

BLE Requires a Bluetooth Smart USB Adaptor (Product No. 2070)

V-Log 4 or 8 2404 or 2408

Add either Wi-Fi or Bluetooth module

Wi-Fi Requires a Wi-Fi module (Product No. 2401)

BLE Requires Bluetooth BLE module (Product No. 2400VL)

V-Log 4 or 8 Wi-Fi 2405 or 2409 Wi-Fi Built in Wi-Fi

V-Hub 4 or 8 2504 or 2508 BLE Built in Bluetooth

Wi-Fi Requires a V-Hub Wi-Fi module (Product No. 2501)

V-Hub 4 or 8 Wi-Fi 2505 or 2509 BLE Built in Bluetooth

Wi-Fi Built in Wi-Fi

Vu+ 2305 BLE Built in Bluetooth

To connect to a data logger

1) When connecting via Wi-Fi ensure the Android is connected to the same network as the data logger

(Settings, Wi-Fi). If connecting via Bluetooth ensure Bluetooth is On but do not pair the device.

2) Start the EasySense App on the Android.

The first device (Android, iOS or PC Windows) that connects to a data logger becomes the Controller and has

access to set up a new recording and start and stop logging. Subsequent devices that connect will have

Viewing rights only.

Notes: Once a connection is established the connect icon will move to the overflow list. If you select Connect to..

while Controlling or Viewing xx, it will automatically disconnect the logger.

3) Tap on the connect icon

4) Select a data logger

from the list that opens

5) The status information will change

from Not Connected to show it is

‘Controlling xx’ or ‘Viewing xx’.

(12.3.4.56)

(12.3.4.55)

(12.3.4.76)

(12.3.4.66)

(12.3.4.11)

(12.3.4.10)



The logging window

Recording data

To begin recording, simply tap on the Start icon.

During logging the icon will show a square. Tap on this icon to stop data being recorded before the

selected duration has passed.

If you want to repeat the last experiment (clear data but keep all the settings the same) simply tap on

the Start icon again.

If you want to graph a new set of data, without the previous set of data being erased select Overlay

before you select Start.

New recording

Select the New icon to set up a new investigation e.g. to change logging mode, duration of a recording, or to

identify a change of sensors or change a sensor’s range

Set up a New recording (Test Mode,

EasyLog, Snapshot, Manual and Timing)

This icon is only available to the device

controlling the logger

Tap here to Start

or Stop logging

Analysis tools (Values, Interval /

Difference, Gradient,

Area, Statistics, Best Fit

Line)

Connected logger’s name

Sensor (Hide/Show,

Scale axis)

Open (Saved Files)

Overflow:

Options for display (Grid,

Overlay, Line Thickness, Graph type)

Share (e.g. Dropbox, Gmail,

Beam, Save to Drive)

Retrieve (a stored data set from a

logger)

Connect to … (to disconnect and

connect to a logger)

About (Network currently

connected, Version No.)



Scroll to the

interval

between the

samples being

taken

The number of samples that will be taken with

this set up will alter automatically

Scroll to the

time span

required for

the experiment

Sensors – use to deselect any sensors from which readings are not required or to change a sensor’s range

Choose your mode of logging:

Test Mode – use to establish the sensor/s current value.

EasyLog

Pre-set to record sensor values continuously as a line graph until stopped.

With EasyLog selected tap on Done.

To begin recording select the Start icon ►. Logging will start with a time

span of 30 seconds and when it has elapsed the time span will double

automatically. This will continue until the recording is stopped by selecting

the Stop icon .

Manual

Use to record sensor values against a chosen time span as a line graph display. Choose the time span and interval between samples.

To change a sensor’s

range, tap on the arrow

Drag left to switch a

sensor OFF (so no

readings will be taken

from this sensor)

A tick will mark the

range currently

selected

Select a new range from the list that

opens, then either Back to return to

the previous screen or Done to finish

Tap in the

Sensors: x row

Select

Manual Select

duration

or sample

rate

Select Done at any

stage when your

selection is complete



If FAST logging (with a sample rate of less than 20 ms) then the option to set a start condition will become available.

Select the Start icon ►. Recording will start when the start condition is met. The recording will stop when the selected time span has passed.

Note: While FAST logging there is no screen display of data until the recording has finished.

Select the Stop icon ■ to stop data being recorded before the selected duration has passed.

Snapshot

Use to record sensor values on demand (manual sampling) with a bar graph display.

Click on the Start icon ► to begin recording. Click within the graph area to collect a sample. Click on the Stop icon to stop data being recorded.

If you click on the Start icon again you will be given the option to add the new readings to the end of the existing data (if No is selected the existing data will be deleted).

Higher than - start recording when the value is above the set level.

SET LEVEL

Lower than - start recording when the value is below the set level.

SET LEVEL

Rises above – logging will

not start until the value

from a sensor rises up

above the set level.

SET LEVEL

Falls below - logging will

not start until the value

from a sensor falls below

the set level.

SET LEVEL

Select ‘None’ for recording

to begin as soon as you tap

on the Start icon.

(Default condition)

b

Select ‘On Level’ to delay the start until a set condition is reached.

Select: a. The trigger sensor b. Whether the value should be higher

than, lower than, rises above or falls below

c. Enter the sensor’s trigger value

c

a



Timing

Timing is used to handle data from switch-type sensors such as Light gates and Timing mats. Measurements can

be taken from either a single sensor connected to Input A, or from two sensors connected to both Input A and B.

Select New to set up an investigation. To perform calculations for Speed/Velocity, Acceleration, Distance,

Momentum and Kinetic Energy, select the type and size of apparatus used in an experiment.

Select New

Select Timing,

then Timing type

to open the

choices available.

Select Done at

any time to finish

your selection

Tap on the apparatus row

and select the type to be

used and enter any

measurements required

for calculation

Select Columns to display any data used in calculating this timing type from the list (this will vary depending on the timing type selected).

Select Display to alter the number of decimals

displayed and the unit of measurement

From Experiment tap on a row to select what

it is you want to measure

Step 1

Step 2

Step 3

Step 4



Choices are:

Apparatus Measurement to enter

Time at A - -

from A to B - -

from A to A e.g. Stopwatch - -

at A or B - -

at A then B - -

period at A e.g. Pendulum - -

Speed /Velocity at A Single interrupt card - length of card (m)

Double interrupt card - segment length (m)

Picket fence - fence pitch (m) & calculation increment

Pulley - none

from A to B - - distance from A to B (m)

at A or B Single interrupt card - length of card (m)

at A then B Single interrupt card - length of card (m)

Distance at A Picket fence - fence pitch (m) & calculation increment

Pulley -

Acceleration at A Double interrupt card - segment length (m)

Picket fence - fence pitch (m) & calculation increment

Pulley - none

at A or B Double interrupt card - segment length (m)

from A to B Single interrupt card - length of card (m)

at A then B Double interrupt card - segment length (m)

change from A to B Double interrupt card - segment length (m)

Momentum and Kinetic Energy

at A Single interrupt card

- length of card (m) - mass of object through A (kg)

Double interrupt card

- segment length (m) - mass of object through A (kg)

Picket fence

- fence pitch (m) - calculation increment - mass of object through A (kg)

Pulley - mass of object through A (kg)

at A or B Single interrupt card

- length of card (m) - mass of object through A (kg) + B (kg)

from A to B - distance from A to B (m) - mass of through A (kg)

at A then A Single interrupt card

- length of card (m) - mass of through A (kg)

change from A to A Single interrupt card

- length of card (m) - mass of object through A (kg)

at A then B Single interrupt card

- length of card (m) - mass of object through A (kg) + B (kg)

change from A to B Single interrupt card

- length of card (mm) - mass of object through A (kg) + B (kg)

Raw Times (interrupt edge

times)

at A - -

at A or B - -



Analysing captured data

The Tools menu has a number of Analysis tools to study captured data.

Values

Drag the marker to select a data point.

Interval/ Difference Drag the 2 markers to choose two points. (Not available in Snapshot or Timing mode)

The Difference

between the data

at these two points

is shown here

The time elapsed between the two points is shown here

2 markers

Marker

The Value at the marker point is shown in the data box and highlighted in the table



Gradient Drag the 2 markers to choose two points. (Not available in Snapshot or Timing mode)

Area (Not available in Snapshot or Timing mode)

This feature is used to calculate and display the area under a chosen section of the graph. The calculation for area is performed on the data from all channels. The units correspond to the product of the Y and X-axis.

2 markers

The gradient line indicates the

slope for whichever sensor is

selected on the Y-axis

To alter the sensor displayed

on this axis, tap in the area

left of the axis and select.

This should be done before you

select the Area tool

The Area is

shown here

The Gradient for the data between

the two markers is shown here

To alter the sensor displayed on this axis,

tap in the area left of the axis and select

This should be done before you select the

Gradient tool

Drag the markers, shading lines will mark the section under

the graph for whichever sensor is selected on the Y-axis



Statistics (Not available in Snapshot or Timing mode) Calculates and displays statistical information about the data collected from the data channel currently selected on the Y-Axis.

Best Fit Line (Not available in Snapshot or Timing mode)

Automatically calculates and draws a linear best fit through the data at the two points selected for the data

channel currently selected on the Y-Axis

y = (mx + c), r2

y = the data channel selected

x = how far along (i.e. time or reading number)

m = the constant of the slope (gradient between two points)

c = the y axis intercept

r2 = the coefficient of determination and is a measure of goodness of fit

e.g. when r2 equals 1.0, all points lie on a straight line with no scatter.

c = the intercept

m = constant

Max: the highest value

Min: the lowest value

Arithmetic Mean and

Standard Deviation (the

scatter of a series of

measurements about

their mean value)

To alter the sensor displayed on this axis, tap in the

area left of the axis and select.

This should be done before you select the Show Statistics tool

Drag the markers to the two points

between which to fit the line



Displaying data

Data Value boxes

The value recorded by a sensor is displayed in a data value

box. The colour used in a data value box corresponds to the

colour of the plotted line and the y-axis label on the graph.

The Table display

When the Android is landscape the graph area will automatically

fill the window. To expose the table rotate to portrait.

Drag in the table area to scroll the data.

When the Values tool is used, data selected on the graph will be highlighted in the table.

Zoom

To magnify an area so that it can be seen in greater detail, pinch two fingers and move apart to zoom in or

pinch together to zoom out on both the X and Y axis. To expand the magnified area further, repeat the above.

Double tap to switch zoom OFF and return to the original graph.

X and Y axis

(2) Select the sensor to

display from the list

This option will not be available

while an Analysis tool is in use

Drag left (OFF) to hide this sensor’s graph line and

value box from view, drag right (ON) to show

Tap below the graph area for the x-axis options.

Time:

• Time - elapsed time in milliseconds (ms), seconds (s), minutes (m), hours (h) and days (d)

• Absolute Time - clock time for the duration of the recording [Absolute Time (hh:mm:ss)

• Seconds - elapsed time in seconds

Reading Number

(1) To alter the

sensor displayed

on the axis, tap in

the area left of

the y-axis.



Show/Hide sensor, Autoscale, Sensor settings

Tap in the

sensor’s data

value box.

(Data value box)

Options: Grid, Overlay, Line thickness, Line or Bar graph, Show Data As

In Timing mode a Show Data As option will also be available. It can be used to recalculate data in another form

without having to repeat an experiment. Select how you want to show the current data and enter any

measurements required for the calculation. E.g. recalculate Distance data collected using a picket fence to

show Speed.

Drag left (OFF) to hide this sensor’s graph line and value box from view.

To show again tap in the area left of the y-axis and drag to ON

Applies Auto scale to this sensor’s data using

the minimum and maximum value

a minimum of zero to maximum value

Select User to let you alter this sensor’s minimum and maximum limits manually

Apply the same scale to any sensors of the same type connected

Set to its original scale

Tap Options for Overlay,

Grid, Line thickness and

graph type menu

With Overlay selected a new set of data can be added to the graph without the previous set of data being erased - useful for repeating an experiment to compare data

Select Grid to mark the graph area

with a faint grating

Overflow icon

(top right of

screen)

Drag to increase or decrease

the thickness of the graph line Use to change between

a line or bar graph



Title

Tap in the area above the graph to enter or edit the Title.

Changing a sensor’s range

Some Smart Q sensors have multiple ranges e.g. a Light Level sensor. The way to change a sensor’s range to one more suitable for an experiment is

Retrieve

Select Retrieve (from the overflow menu ) to collect stored data from a logger. A dialog box will open showing a list of the data files stored in the data logger’s memory, tap on a file to open Retrieved data can be used in the same way as real-time data i.e. it can be analysed, saved and printed.

Share

Use to access share file transfer tools e.g. if your Android is connected to a network with Internet access you

can send a data file via email or add to Dropbox. The list available will depend on what apps are installed on

your tablet.

1. Select the New

recording wizard icon

3. Tap on the sensor’s arrow

The current

range is marked

by a tick

2. Tap on the

Sensors: x arrow

4. Select a new range from the list

that opens, then either Back to

return to the previous screen or

Done to finish



File options

Open file

To load previously saved data files select or Open from overflow menu and tap on a file to open.

Delete file

Select Open file, locate the file in the saved file list, touch and long hold the file and select Delete.

Saving files

Data is auto-saved within the program. The file name auto-defaults to the creation date & time.

File name

Select Open file, locate the file (default name is the creation date & time), touch and long hold the file, select

Move, then Rename and type in a new name.

EasySense Software Multi-user Site Licence

Definitions

The following expressions have the meanings given here:

‘DHG’ means Data Harvest Group Limited, being owner of all intellectual property rights in the Software

‘Documentation’ means both printed and electronic user documentation.

‘Software’ means the program supplied.

Licence

This software package may be freely used, copied, and disseminated. This includes any associated documentation and user guides.

The software may not be amended, changed or altered in anyway.

Limited Warranty and Disclaimer of Liability

The Software is supplied ‘as is’; DHG makes no warranty, whether express or implied, as to the merchant ability of the Software or its fitness for any particular purpose. In no circumstances will DHG be liable for any damage, loss of profits, goodwill or for any indirect or consequential loss arising out of your use of the Software, or inability to use the Software, even if DHG has been advised of the possibility of such loss. General

These conditions supersede any prior agreement, oral or written, between the licensee and DHG relating to the software.

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