Difference between revisions of "Activities/Measure"

Latest revision as of 02:34, 14 July 2018

Measure

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

The source file has been moved to GitHub

@@ Line 1: / Line 1: @@
-[[Image:Measure-icon.svg]]
+== Measure ==
-==About==
+Read at https://help.sugarlabs.org/measure.html
-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.
-As well as graphing signal as a function of time, Measure can also graph as a function of frequency.
+The source file has been moved to [https://github.com/godiard/help-activity/blob/master/source/measure.rst GitHub]
-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.
-'''Note:''' As of Measure Version 37, older versions of Sugar, e.g. 0.84, are no longer supported.
-[[File:Measure tut 1 24.jpg|center|300px]]
-===Where to get Measure===
-http://activities.sugarlabs.org/en-US/sugar/addon/4197/
-==Using==
-[[image:Measure-screen.JPG|600px|center]]
-;1. Select secondary toolbar: Allows the Activity's Journal entry to be renamed
-;2. Select secondary toolbar: Measurement settings
-;3. Select secondary toolbar: Tuning settings
-;4. Time base/frequency: Plots the signal vs. time or plots amplitude vs. frequency
-;5. The time scale: Used to scale the plot
-;6. Freeze the display: Pause the program
-;7. Capture sample now: Saves an image of the wave in the Sugar Journal
-;8. Stop: Exits the Activity
-;9. Mute: Mute/unmute channel
-;10. Invert: invert the display
-;11. Amplitude adjustment: Use these sliders to control the sensitivity
-;12. Caption: A summary of current settings that are selected
-===Sensor toolbar===
-[[File:Measure2ndtoolbar.JPG|600px|center]]
-The sensor toolbar - measurement settings
-;13. Sound: Use this setting with the internal microphone, external microphone and external AC signals
-;14. Resistance sensor: Use with external resistive type transducers
-;15. Voltage sensor: Use with external sensors which generate a voltage
-;16. Sample interval: A log file 'Measure Log' is saved to the journal, it contains one sample per interval
-;17. Starts/stops saving a log file: 'Measure Log' with measured values as readable text
-;18. Trigger: Synchronise the sample period to the waveform so that the sample will start on a rising edge or falling edge
-''There is no 19.''
-'''Note:''' Whenever you switch sensing modes, Measure switches to time-base plotting.
-===Tuning toolbar===
-[[File:Measure3rdtoolbar.JPG|600px|center]]
-The tuning toolbar - frequency settings
-'''Hint:''' Adjust the time scale (#5) to increase the spacing between the tuning lines.
-;20. Instrument: Select instrument to tune.
-;21. Note entry: Select a note for tuning.
-;22. Frequency entry: The frequency of the target note is displayed. (The user can also enter a frequency to target.)
-;23. Show/hide tuning mark: A tuning mark displays the target note on the plot.
-;24. Show/hide harmonics: Harmonic lines are integer multiples of the target frequency.
-;25. Play a note: Plays a five-second sample of the target note. (Sampling is disabled while the note is playing.)
-;26. Measured note: An estimate of the note being played is displayed. If the note is slightly flat or sharp, relative to the target, it is displayed in color (red == very flat or sharp; yellow == somewhat flat or sharp).
-'''Note:''' Whenever you switch to a tuning mode, Measure switches to frequency-base plotting.
-====Measuring A5 (880 HZ)====
-[[Image:Measure-tuning.JPG|600px|center]]
-====Guitar tuning lines====
-[[Image:Measure-guitar.png|600px|center]]
-==Applying==
-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.
-The children should learn through guided discovery that:
-* sound is a pressure wave
-* the pitch of the sound is determined by the frequency or cycles per second (Hz)
-* the loudness of a sound is determined by the amplitude
-* sounds contain multiple frequency components or harmonics
-* the more pure sounds have less harmonics
-==Sharing==
-This Activity does not currently support sharing. However, it is useful to use one XO for measuring and another for generating sounds.
-==Extending==
-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.
-Care should be taken not to exceed the allowable input voltage:
-* XO-1    -0.5V to 5V
-* XO-1.5  -6V to +9V
-* XO-1.75 -6V to +9V
-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.
-[[image:Audio 680 ohm.jpg|center|300px]]
-===Plotting===
-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.
-[[File:SimpleGraph8.png|center|300px]]
-===More ideas===
-You can find ideas for fun science experiments at [[Activities/TurtleArt/Using_Turtle_Art_Sensors]] and http://wiki.laptop.org/go/Measure
-===Building sensors===
-There are detailed  instructions for building sensors at http://wiki.laptop.org/go/Measure#How_to_build_low_cost_sensors
-===Adding instruments===
-You can add new instruments to tune by modifying the instrument dictionary in config.py.
- INSTRUMENT_DICT = {
-    _('Guitar'): [82.4069, 110, 146.832, 195.998, 246.942, 329.628],
-    _('Violin'): [195.998, 293.665, 440, 659.255],
-    _('Viola'): [130.813, 195.998, 293.665, 440],
-    _('Cello'): [65.4064, 97.9989, 146.832, 220],
-    _('Bass'): [41.2034, 55, 73.4162, 97.9989],
-    _('Charango'): [329.63, 392, 440, 523.25, 659.26],
-    _('Ukulele'): [261.626, 329.628, 391.995, 440],
-    _('Sitar'): [174.614, 130.813, 195.998, 65.4064, 391.995, 261.626, 523.251],
-    _('Mandolin'): [195.998, 293.665, 440, 659.255],
-    _('Recorder'): [391.995]
-    }
-== Reporting problems ==
-Make comments/suggestions on the [[Talk:Activities/Measure]] page.
-Please file bugs at [https://bugs.sugarlabs.org/newticket?component=Meausre].
-To list all open tickets of Measure, see [https://bugs.sugarlabs.org/query?status=accepted&status=assigned&status=new&status=reopened&component=Measure].
-[[Category: Activity]]

Difference between revisions of "Activities/Measure"

Latest revision as of 02:34, 14 July 2018

Measure

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