https://phyphox.org/forums/ Fri, 01 May 2026 02:19:47 +0000 MyBB https://phyphox.org/forums/showthread.php?tid=2071 Wed, 08 Jan 2025 14:05:03 +0000 Bartolomeo Rizzo]]> https://phyphox.org/forums/showthread.php?tid=2071
I am a student and we used the app for a physics lab experiment. We measured Earth's magnetic field with the magnetometer.

With your group we were wondering how the magnetometer exactly works: does it only measure the absolute value of the magnetic field and then it derives the various components or, what we think is more likely, does it measure the three components and the absolute value is the vectorial sum of them?

Or maybe it measures all four of them?

We need to understand this for error propagation specifically.

Thankyou in advance!]]>
I am a student and we used the app for a physics lab experiment. We measured Earth's magnetic field with the magnetometer.

With your group we were wondering how the magnetometer exactly works: does it only measure the absolute value of the magnetic field and then it derives the various components or, what we think is more likely, does it measure the three components and the absolute value is the vectorial sum of them?

Or maybe it measures all four of them?

We need to understand this for error propagation specifically.

Thankyou in advance!]]> https://phyphox.org/forums/showthread.php?tid=1838 Tue, 05 Dec 2023 10:11:14 +0000 TorstenKlf]]> https://phyphox.org/forums/showthread.php?tid=1838 I would like to introduce a multi purpose sensor module that can be used on air tracks (Newton's 2nd Law), spring pedulums and experiments on centrifugal force. Sorry, it's in german.
https://phyphox.org/wiki/index.php/Luftk...ederpendel


Regards
Torsten]]> I would like to introduce a multi purpose sensor module that can be used on air tracks (Newton's 2nd Law), spring pedulums and experiments on centrifugal force. Sorry, it's in german.
https://phyphox.org/wiki/index.php/Luftk...ederpendel


Regards
Torsten]]> https://phyphox.org/forums/showthread.php?tid=1703 Mon, 20 Feb 2023 06:59:58 +0000 mondherammar]]> https://phyphox.org/forums/showthread.php?tid=1703 j m a teatcher and i want to mesure amplitude of oscillations  (spring)
so i ask if i can do this with phyphox
please help me]]> j m a teatcher and i want to mesure amplitude of oscillations  (spring)
so i ask if i can do this with phyphox
please help me]]> https://phyphox.org/forums/showthread.php?tid=1441 Mon, 04 Oct 2021 00:02:54 +0000 Erik Josefsson]]> https://phyphox.org/forums/showthread.php?tid=1441
If two phyphoxphones at some distance from each other is set to generate a 1000 Hz sound wave (it's uncomfortable but not dangerous I think) then you should get interference/superposition at the same distance (0.34 m) as the local speed of sound (340 m/s).

Is there a way to use a third phyphoxphone to manually find two or three of these maxima/minima? Exact measurement not needed, but a distance that students could confirm looks like about 30 cm would be great.

Anyone tried to do it with "Audio Amplitude"?

I hope it is possible to do with less gear than anno dazumal (see attached png)!

Best regards.

//Erik

  Screenshot_2021-10-04_01-37-56.png (Size: 125.19 KB / Downloads: 797) ]]>
If two phyphoxphones at some distance from each other is set to generate a 1000 Hz sound wave (it's uncomfortable but not dangerous I think) then you should get interference/superposition at the same distance (0.34 m) as the local speed of sound (340 m/s).

Is there a way to use a third phyphoxphone to manually find two or three of these maxima/minima? Exact measurement not needed, but a distance that students could confirm looks like about 30 cm would be great.

Anyone tried to do it with "Audio Amplitude"?

I hope it is possible to do with less gear than anno dazumal (see attached png)!

Best regards.

//Erik

  Screenshot_2021-10-04_01-37-56.png (Size: 125.19 KB / Downloads: 797) ]]> https://phyphox.org/forums/showthread.php?tid=1431 Sat, 18 Sep 2021 22:52:18 +0000 Erik Josefsson]]> https://phyphox.org/forums/showthread.php?tid=1431
If phone one takes a photo (with flash) of phones two and three while both measure light you should get two stopwatches starting at the same time.

See gif below (sorry for quality and that only one phone is triggered in the gif).

  Flash-triggered-time-measurements.gif (Size: 385.79 KB / Downloads: 843)
Is there a simple way of assessing how accurate such a measurement can be?

(for example, as in the gif, when measuring the speed of a passing LED-light mounted on a toy car)

Best regards.

//Erik]]>
If phone one takes a photo (with flash) of phones two and three while both measure light you should get two stopwatches starting at the same time.

See gif below (sorry for quality and that only one phone is triggered in the gif).

  Flash-triggered-time-measurements.gif (Size: 385.79 KB / Downloads: 843)
Is there a simple way of assessing how accurate such a measurement can be?

(for example, as in the gif, when measuring the speed of a passing LED-light mounted on a toy car)

Best regards.

//Erik]]> https://phyphox.org/forums/showthread.php?tid=1430 Sat, 18 Sep 2021 17:44:17 +0000 Erik Josefsson]]> https://phyphox.org/forums/showthread.php?tid=1430
Did anyone try to drop a BT speaker from 2 meters and measure the doppler effect?

The rotating gear in this video by Lukas and Thomas is great:

https://www.youtube.com/watch?v=r4Nl7oIzCco

but perhaps you can measure doppler with just a BT speaker falling towards a phyphox phone?

Best regards.

//Erik]]>
Did anyone try to drop a BT speaker from 2 meters and measure the doppler effect?

The rotating gear in this video by Lukas and Thomas is great:

https://www.youtube.com/watch?v=r4Nl7oIzCco

but perhaps you can measure doppler with just a BT speaker falling towards a phyphox phone?

Best regards.

//Erik]]> https://phyphox.org/forums/showthread.php?tid=1384 Mon, 05 Jul 2021 16:06:03 +0000 Erik Josefsson]]> https://phyphox.org/forums/showthread.php?tid=1384
I have a couple of old Samsung Galaxy S III phones I plan to use as "lab-phones". Unfortunately the branch of the OS they run is no longer maintained (phyphox works OK anyway as far as I can see).

Does anyone have a good picture of whether there is a living living branch of some free OS that can run phyphox on phones that are cheap enough for experiments that could go wrong (i.e. phone+balloon)?

Best regards.

//Erik]]>
I have a couple of old Samsung Galaxy S III phones I plan to use as "lab-phones". Unfortunately the branch of the OS they run is no longer maintained (phyphox works OK anyway as far as I can see).

Does anyone have a good picture of whether there is a living living branch of some free OS that can run phyphox on phones that are cheap enough for experiments that could go wrong (i.e. phone+balloon)?

Best regards.

//Erik]]> https://phyphox.org/forums/showthread.php?tid=1383 Mon, 05 Jul 2021 13:14:01 +0000 Erik Josefsson]]> https://phyphox.org/forums/showthread.php?tid=1383
I have a couple of old Samsung Galaxy S III phones I plan to use as "lab-phones". Unfortunately the branch of the OS they run is no longer maintained (phyphox works OK anyway as far as I can see).

Does anyone have a good picture of which branches of which free OSes that I could switch to?

The idea is to use working, but cheap, phones for experiments that actually could go wrong (i.e. phone+balloon).

Best regards.

//Erik]]>
I have a couple of old Samsung Galaxy S III phones I plan to use as "lab-phones". Unfortunately the branch of the OS they run is no longer maintained (phyphox works OK anyway as far as I can see).

Does anyone have a good picture of which branches of which free OSes that I could switch to?

The idea is to use working, but cheap, phones for experiments that actually could go wrong (i.e. phone+balloon).

Best regards.

//Erik]]> https://phyphox.org/forums/showthread.php?tid=1334 Mon, 19 Apr 2021 03:07:55 +0000 solid]]> https://phyphox.org/forums/showthread.php?tid=1334 ...
The example shows 3 turns left and then 1 turn right.

  gyroscope_turns.phyphox (Size: 28.35 KB / Downloads: 838)

  Gyroscope rotation rate and number of turns 2021-04-19 04-50-20.png (Size: 76.62 KB / Downloads: 1029) ]]> ...
The example shows 3 turns left and then 1 turn right.

  gyroscope_turns.phyphox (Size: 28.35 KB / Downloads: 838)

  Gyroscope rotation rate and number of turns 2021-04-19 04-50-20.png (Size: 76.62 KB / Downloads: 1029) ]]> https://phyphox.org/forums/showthread.php?tid=1333 Tue, 06 Apr 2021 18:20:50 +0000 solid]]> https://phyphox.org/forums/showthread.php?tid=1333
  CpCv_bottle3.pdf (Size: 298.71 KB / Downloads: 2526)

  gamma_CpCv_dT(bottle).phyphox (Size: 6.52 KB / Downloads: 717) ]]>
  CpCv_bottle3.pdf (Size: 298.71 KB / Downloads: 2526)

  gamma_CpCv_dT(bottle).phyphox (Size: 6.52 KB / Downloads: 717) ]]> https://phyphox.org/forums/showthread.php?tid=832 Wed, 13 May 2020 06:48:14 +0000 adomps]]> https://phyphox.org/forums/showthread.php?tid=832 J'ai utilisé Phyphox avec mes élèves pour mesurer le champ magnétique terrestre et celui d'un petit aimant. C'est un TP que j'ai mis au point pendant le confinement pour que les élèves le fassent chez eux. Très peu de matériel est nécessaire et les résultats sont quantitativement assez bons. L'énoncé est adapté à des élèves de premier cycle universitaire. Je fournis aussi un fichier de réponses avec mes résultats.

  magnetisme_pour_phyphox-min.pdf (Size: 212.61 KB / Downloads: 3982)

  magnetisme_reponses.pdf (Size: 241.06 KB / Downloads: 1896) ]]> J'ai utilisé Phyphox avec mes élèves pour mesurer le champ magnétique terrestre et celui d'un petit aimant. C'est un TP que j'ai mis au point pendant le confinement pour que les élèves le fassent chez eux. Très peu de matériel est nécessaire et les résultats sont quantitativement assez bons. L'énoncé est adapté à des élèves de premier cycle universitaire. Je fournis aussi un fichier de réponses avec mes résultats.

  magnetisme_pour_phyphox-min.pdf (Size: 212.61 KB / Downloads: 3982)

  magnetisme_reponses.pdf (Size: 241.06 KB / Downloads: 1896) ]]> https://phyphox.org/forums/showthread.php?tid=789 Sat, 25 Apr 2020 17:10:46 +0000 Maureen Wade]]> https://phyphox.org/forums/showthread.php?tid=789 Thank you in advance.]]> Thank you in advance.]]> https://phyphox.org/forums/showthread.php?tid=77 Tue, 13 Nov 2018 04:27:54 +0000 jbshute]]> https://phyphox.org/forums/showthread.php?tid=77
I am working on detecting the possible IP addresses so the hook up is instantaneous and downloads are fast as possible. I am also time stamping the data using the cell phones clock. If all the cell phones are updated on time, I should be able to get a pretty good alignment.

Next I am working on code to poll the folder containing the data and have a real time buffer of several devices within the same workspace. This will be useful for all kinds of fun experiments. 

My goal is to make something that is very distributable and easy to get running on any pc. I think the process of logging data, transfering it off the device, or accessing it through python may be too much overhead for some people to take it on. Those people might otherwise have great contributions to this space though.


#Python code starts here!!!!

import os
imprt requests
import numpy as np
import urllib.request
import json
import time
import webbrowser 
import datetime
from matplotlib.dates import date2num
import pandas as pd
import matplotlib.pyplot as plt
import copy as copy
import pickle



IPAddress = ('10.0.0.236:8080','10.0.0.238:8080')  #IP address and port This is different for each person and specified by the phyphox app
save_dir = 'C:/Chronic_IOT/' #Where the data will be saved

data_dur = 10

session_log = [];
print('New Session Starting')

session_log  = np.append(session_log,datetime.datetime.now())
while True:
    
    for indy in range(0,len(IPAddress)):  #Go through each IP address
        IPAddress_c = IPAddress[indy] #Set the IP address
        start_dat = 'http://' + IPAddress_c + '/control?cmd=start'  #Starting a data collection
   
        try:
            urllib.request.urlopen(start_dat) #Start collecting data!!
            print('Polling device ' + str(indy) + ' for data')
        except:
            print('Device ' + str(indy) + ' Failed to hookup')
            
    time.sleep(data_dur)  
    
    for indy in range(0,len(IPAddress)):  #Go through each IP address
        IPAddress_c = IPAddress[indy] #Set the IP address
        clear_dat = 'http://' + IPAddress_c + '/control?cmd=clear'  #Clearing a data collection
        start_dat = 'http://' + IPAddress_c + '/control?cmd=start'  #Starting a data collection
        save_dat = 'http://' + IPAddress_c + '/export?format=0'  #Saving data

        try:
            r = requests.get(save_dat) #Get a CSV file sent from the clock
            print('Captured data from device: ' + str(indy))
            urllib.request.urlopen(clear_dat) #Restart the data to reduce filesize
            urllib.request.urlopen(start_dat) #Restart the data to reduce filesize
            
                #Saving data
            tmp_val = r.headers['Content-Disposition'] #Get the filename associated with the xls
            nm_Ts = tmp_val[22:len(tmp_val)-4] #Extract the experiment name and timestamp
            
            open(save_dir + 'TS_' + nm_Ts + '_IP_' + IPAddress_c.replace(':','pp') + '_data.xls', 'wb').write(r.content) #Write the data to a file
            
        except:
            print('Device ' + str(indy) + ' Failed to hookup')
    
    
 #Python code ends here!!!!]]>
I am working on detecting the possible IP addresses so the hook up is instantaneous and downloads are fast as possible. I am also time stamping the data using the cell phones clock. If all the cell phones are updated on time, I should be able to get a pretty good alignment.

Next I am working on code to poll the folder containing the data and have a real time buffer of several devices within the same workspace. This will be useful for all kinds of fun experiments. 

My goal is to make something that is very distributable and easy to get running on any pc. I think the process of logging data, transfering it off the device, or accessing it through python may be too much overhead for some people to take it on. Those people might otherwise have great contributions to this space though.


#Python code starts here!!!!

import os
imprt requests
import numpy as np
import urllib.request
import json
import time
import webbrowser 
import datetime
from matplotlib.dates import date2num
import pandas as pd
import matplotlib.pyplot as plt
import copy as copy
import pickle



IPAddress = ('10.0.0.236:8080','10.0.0.238:8080')  #IP address and port This is different for each person and specified by the phyphox app
save_dir = 'C:/Chronic_IOT/' #Where the data will be saved

data_dur = 10

session_log = [];
print('New Session Starting')

session_log  = np.append(session_log,datetime.datetime.now())
while True:
    
    for indy in range(0,len(IPAddress)):  #Go through each IP address
        IPAddress_c = IPAddress[indy] #Set the IP address
        start_dat = 'http://' + IPAddress_c + '/control?cmd=start'  #Starting a data collection
   
        try:
            urllib.request.urlopen(start_dat) #Start collecting data!!
            print('Polling device ' + str(indy) + ' for data')
        except:
            print('Device ' + str(indy) + ' Failed to hookup')
            
    time.sleep(data_dur)  
    
    for indy in range(0,len(IPAddress)):  #Go through each IP address
        IPAddress_c = IPAddress[indy] #Set the IP address
        clear_dat = 'http://' + IPAddress_c + '/control?cmd=clear'  #Clearing a data collection
        start_dat = 'http://' + IPAddress_c + '/control?cmd=start'  #Starting a data collection
        save_dat = 'http://' + IPAddress_c + '/export?format=0'  #Saving data

        try:
            r = requests.get(save_dat) #Get a CSV file sent from the clock
            print('Captured data from device: ' + str(indy))
            urllib.request.urlopen(clear_dat) #Restart the data to reduce filesize
            urllib.request.urlopen(start_dat) #Restart the data to reduce filesize
            
                #Saving data
            tmp_val = r.headers['Content-Disposition'] #Get the filename associated with the xls
            nm_Ts = tmp_val[22:len(tmp_val)-4] #Extract the experiment name and timestamp
            
            open(save_dir + 'TS_' + nm_Ts + '_IP_' + IPAddress_c.replace(':','pp') + '_data.xls', 'wb').write(r.content) #Write the data to a file
            
        except:
            print('Device ' + str(indy) + ' Failed to hookup')
    
    
 #Python code ends here!!!!]]>