Difference between revisions of "Activities/Measure"

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[[Image:Measure-icon.svg]]
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== Measure ==
  
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==About==
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Read at https://help.sugarlabs.org/measure.html
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This Activity draws a picture of the sound heard by the internal microphone or of the signal present on the microphone socket. More specifically it draws a graph of this input versus time, the input is on the vertical axis and time is on the horizontal axis. That is, the laptop functions like a machine called an oscilloscope.  
 
  
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As well as graphing signal as a function of time, Measure can also graph as a function of frequency.
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The source file has been moved to [https://github.com/godiard/help-activity/blob/master/source/measure.rst GitHub]
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The XO-1 laptop is only capable of mono input, the XO-1.5 and XO-1.75 are capable of stereo input on their microphone socket and can graph two signals at once.
 
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'''Note:''' As of Measure Version 37, older versions of Sugar, e.g. 0.84, are no longer supported.
 
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[[File:Measure tut 1 24.jpg|center|300px]]
 
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===Where to get Measure===
 
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http://activities.sugarlabs.org/en-US/sugar/addon/4197/
 
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==Using==
 
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[[image:Measure-screen.JPG|600px|center]]
 
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1. Select secondary toolbar - allows the Activity's Journal entry to be renamed
 
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2. Select secondary toolbar - measurement settings
 
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3. Select secondary toolbar - tuning settings
 
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4. The selected input type - Sound (AC voltage), resistance or DC voltage
 
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5. The time scale
 
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6. Freeze the display
 
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7. Capture sample now - saves an image of the wave in the Journal
 
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8. Stop - exits the Activity
 
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9. Mute - mute/unmute channel
 
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10. Invert - invert the display
 
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11. Use these sliders to control the sensitivity
 
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12. The settings that are selected
 
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===Sensor toolbar===
 
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[[File:Measure2ndtoolbar.JPG|600px|center]]
 
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The sensor toolbar - measurement settings
 
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13. Sound - use this setting with the internal microphone, external microphone and external AC signals
 
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14. Resistance sensor - use with external resistive type transducers
 
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15. Voltage sensor - use with external sensors which generate a voltage
 
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16. Time base/frequency - graphs the signal vs. time or graphs amplitude vs. frequency
 
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17. Sample interval - a text file 'Measure Log' is saved to the journal, it contains one sample per interval
 
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18. Starts/stops saving a text file 'Measure Log' with measured values as readable text
 
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19. Trigger - synchronise the sample period to the waveform so that the sample will start on a rising edge or falling edge
 
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===Tuning toolbar===
 
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[[File:Measure3rdtoolbar.JPG|600px|center]]
 
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The tuning toolbar - frequency settings
 
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'''Hint:''' Adjust the time scale (#5) to increase the spacing between the tuning lines.
 
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20. Instrument - select instrument to tune
 
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21. Note entry - select a note for tuning
 
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22. Frequency entry - enter a frequency to mark
 
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23. Show/hide tuning mark
 
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24. Show/hide harmonics
 
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25. Play a note
 
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26. Measured note
 
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====Measuring A5 (880 HZ)====
 
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[[Image:Measure-tuning.JPG|600px|center]]
 
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====Guitar tuning lines====
 
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[[Image:Measure-guitar.png|600px|center]]
 
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==Applying==
 
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Let the children experiment with the internal microphone, try singing, whistling, musical instruments, the Tam Tam musical Activity. The Turtle Blocks Activity can generate an audio tone.
 
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The children should learn through guided discovery that:
 
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* sound is a pressure wave
 
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* the pitch of the sound is determined by the frequency or cycles per second (Hz)
 
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* the loudness of a sound is determined by the amplitude
 
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* sounds contain multiple frequency components or harmonics
 
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* the more pure sounds have less harmonics
 
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==Sharing==
 
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This Activity does not currently support sharing.
 
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==Extending==
 
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Measure is able to take input from a wide range of external sensors including switches, photocells, temperature sensors, inductive loops, hall effect sensors, soil probes and many more.
 
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Care should be taken not to exceed the allowable input voltage:
 
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* XO-1    -0.5V to 5V
 
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* XO-1.5  -6V to +9V
 
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* XO-1.75 -6V to +9V
 
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It is a good idea, particularly on the XO-1, to put a resistor of 680 ohms in the phono plug, this increases the allowable input voltage range.
 
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[[image:Audio 680 ohm.jpg|center|300px]]
 
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===Plotting===
 
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You can use save data from measure to the Sugar Journal using the Capture feature described above ([[Activities/Measure#Using|16]]). These data can then be imported into [[Activities/SimpleGraph#Graphing_Measure_data|SimpleGraph]], where they are displayed.
 
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[[File:SimpleGraph8.png|center|300px]]
 
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===More ideas===
 
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You can find ideas for fun science experiments at http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors and http://wiki.laptop.org/go/Measure
 
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===Building sensors===
 
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There are detailed  instructions for building sensors at [http://wiki.laptop.org/go/Measure#How_to_build_low_cost_sensors].
 
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===Adding instruments===
 
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You can add new instruments to tune by modifying the instrument dictionary in config.py.
 
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[[Category: Activity]]
 

Latest revision as of 01:34, 14 July 2018

Measure

Read at https://help.sugarlabs.org/measure.html

The source file has been moved to GitHub

Retrieved from "https://wiki.sugarlabs.org/index.php?title=Activities/Measure&oldid=101950"