<![CDATA[phyphox Forums - Bugs and Problems]]> https://phyphox.org/forums/ Wed, 17 Jun 2026 01:25:59 +0000 MyBB <![CDATA[About fluctuating sampling rate]]> https://phyphox.org/forums/showthread.php?tid=2356 Wed, 10 Jun 2026 07:24:48 +0000 nguyenkhoi]]> https://phyphox.org/forums/showthread.php?tid=2356 I am doing the Acceleration Spectrum experiment with an iPhone 12 Pro Max (whose accelermoter's sampling rate is at 100Hz).
Since I want to limit the sampling rate to another number, I changed a bit in the code.
- <input>
    <sensor type="accelerometer" rate="0">  # I changed to 50 and 80

I succeeded in loading the experiment to my phone already.
However, there were some strange things:
- For the 50Hz case: Sometimes the sampling rate starts at 33Hz and then slowly reaching 45 Hz and fluctuates; sometimes it starts perfectly at 50Hz and does not change at all
- For the 80Hz case: The sampling rate is always at 50Hz

I would really appreciate it if you could let me know what the reasons might be.
And maybe a way to fix?

Thank you for your time!]]> I am doing the Acceleration Spectrum experiment with an iPhone 12 Pro Max (whose accelermoter's sampling rate is at 100Hz).
Since I want to limit the sampling rate to another number, I changed a bit in the code.
- <input>
    <sensor type="accelerometer" rate="0">  # I changed to 50 and 80

I succeeded in loading the experiment to my phone already.
However, there were some strange things:
- For the 50Hz case: Sometimes the sampling rate starts at 33Hz and then slowly reaching 45 Hz and fluctuates; sometimes it starts perfectly at 50Hz and does not change at all
- For the 80Hz case: The sampling rate is always at 50Hz

I would really appreciate it if you could let me know what the reasons might be.
And maybe a way to fix?

Thank you for your time!]]> <![CDATA[About loading a .phyphox file into the app + Missing part]]> https://phyphox.org/forums/showthread.php?tid=2355 Mon, 08 Jun 2026 04:29:39 +0000 nguyenkhoi]]> https://phyphox.org/forums/showthread.php?tid=2355
I am having a problem in terms of loading a .phyphox file into the app.
My purpose for doing this is to limit the accelerometer's sampling rate to 50Hz.

1) I originally took the code from https://github.com/phyphox/phyphox-exper...um.phyphox
Then I changed <phyphox version="1.7" locale="en"> to  <phyphox version="1.2.0" locale="en"> so as to match the current version of Phyphox on my phone; and <sensor type="accelerometer" rate="0"> to  <sensor type="accelerometer" rate="50">

When I loaded this experiment onto Google Drive and logged in phyphox://[URL], the error shows as
''exp_error
Could not load experiment: Invalid experiment file. Unkown file format.''
I would really appreciate if you guys could show me where I could have gone wrong in my practice.

2) I managed to add the experiment to Phyphox by sending through email and opening directly with Phyphox.
However, there is a function missing in Github version compared to the version from AppStore,
which is the Peak Frequency (Hz) - Time graph in the History section (you can see in my attachment below.
Where should I find the code for the missing part?

Thank you so much for your time!

.png   スクリーンショット 2026-06-08 132628.png (Size: 60 KB / Downloads: 3) ]]>
I am having a problem in terms of loading a .phyphox file into the app.
My purpose for doing this is to limit the accelerometer's sampling rate to 50Hz.

1) I originally took the code from https://github.com/phyphox/phyphox-exper...um.phyphox
Then I changed <phyphox version="1.7" locale="en"> to  <phyphox version="1.2.0" locale="en"> so as to match the current version of Phyphox on my phone; and <sensor type="accelerometer" rate="0"> to  <sensor type="accelerometer" rate="50">

When I loaded this experiment onto Google Drive and logged in phyphox://[URL], the error shows as
''exp_error
Could not load experiment: Invalid experiment file. Unkown file format.''
I would really appreciate if you guys could show me where I could have gone wrong in my practice.

2) I managed to add the experiment to Phyphox by sending through email and opening directly with Phyphox.
However, there is a function missing in Github version compared to the version from AppStore,
which is the Peak Frequency (Hz) - Time graph in the History section (you can see in my attachment below.
Where should I find the code for the missing part?

Thank you so much for your time!

.png   スクリーンショット 2026-06-08 132628.png (Size: 60 KB / Downloads: 3) ]]> <![CDATA[Slider lazy/notinit value big issue]]> https://phyphox.org/forums/showthread.php?tid=2335 Tue, 12 May 2026 09:34:14 +0000 Dentka15]]> https://phyphox.org/forums/showthread.php?tid=2335 I have big issue with slider component (other have the same issue) with ESP32 library.
PhyphoxBLE::read(...)
return always 0 (lazy not init value) until I do some change on Slider.
Slider example:
<slider default="1.0" minValue="-5.0" maxValue="5.0" stepSize="1.0">

I can workaround it by
Code:
if(readValue) { destvalue = readValue; }
 but only for cases where slider doesn't have 0, like <1,5>, but for range <-5,5> i have 0 and it cause another issue.

Question is: how to change not init/lazy value by NaN vale or MAX_VALUE to prevent "Null" as 0.

Or how to force phyphox to init component (e.g. Slider) to start sending real values, even it is not touched?

This issue blow my application which I'm working on since 2 weeks. 

I tried to change code of libraries to return not init values as NaN, but I failed. Is it possible to do on ESP32 code, or do we need to change code of phyphox?]]> I have big issue with slider component (other have the same issue) with ESP32 library.
PhyphoxBLE::read(...)
return always 0 (lazy not init value) until I do some change on Slider.
Slider example:
<slider default="1.0" minValue="-5.0" maxValue="5.0" stepSize="1.0">

I can workaround it by
Code:
if(readValue) { destvalue = readValue; }
 but only for cases where slider doesn't have 0, like <1,5>, but for range <-5,5> i have 0 and it cause another issue.

Question is: how to change not init/lazy value by NaN vale or MAX_VALUE to prevent "Null" as 0.

Or how to force phyphox to init component (e.g. Slider) to start sending real values, even it is not touched?

This issue blow my application which I'm working on since 2 weeks. 

I tried to change code of libraries to return not init values as NaN, but I failed. Is it possible to do on ESP32 code, or do we need to change code of phyphox?]]> <![CDATA["Add Experiment for Bluetooth Device" reporting when Bluetooth disabled.]]> https://phyphox.org/forums/showthread.php?tid=2274 Sun, 26 Apr 2026 09:04:13 +0000 The Technician]]> https://phyphox.org/forums/showthread.php?tid=2274
Amazing toolbox! Thankyou for making it available for everyone! ☺️

Attempting to use the 
    "Add Experiment for Bluetooth Device"
when Bluetooth is disabled gives
    "Bluetooth scan error. Bluetooth Low Energy is not supported on Android Versions lower than 4.3"
Tried re-running with Bluetooth enabled, and it proceeds just fine.

Thought the error-message could be improved to suggest enabling Bluetooth.

Thanks

T]]>
Amazing toolbox! Thankyou for making it available for everyone! ☺️

Attempting to use the 
    "Add Experiment for Bluetooth Device"
when Bluetooth is disabled gives
    "Bluetooth scan error. Bluetooth Low Energy is not supported on Android Versions lower than 4.3"
Tried re-running with Bluetooth enabled, and it proceeds just fine.

Thought the error-message could be improved to suggest enabling Bluetooth.

Thanks

T]]> <![CDATA[Problem with ESP32 C3 super mini]]> https://phyphox.org/forums/showthread.php?tid=2188 Tue, 14 Oct 2025 06:52:04 +0000 vunguyen]]> https://phyphox.org/forums/showthread.php?tid=2188
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp:107:40: error: 'esp_ble_gatts_cb_param_t' has not been declared
  107 |    void onConnect(BLEServer* pServer, esp_ble_gatts_cb_param_t *param) {
      |                                        ^~~~~~~~~~~~~~~~~~~~~~~~
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp: In member function 'void MyServerCallbacks::onConnect(BLEServer*, int*)':
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp:108:40: error: request for member 'connect' in '* param', which is of non-class type 'int'
  108 |      pServer->updateConnParams(param->connect.remote_bda,PhyphoxBLE::minConInterval,PhyphoxBLE::maxConInterval,PhyphoxBLE:ConfusedlaveLatency,PhyphoxBLE::timeout);
      |                                        ^~~~~~~
exit status 1]]>
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp:107:40: error: 'esp_ble_gatts_cb_param_t' has not been declared
  107 |    void onConnect(BLEServer* pServer, esp_ble_gatts_cb_param_t *param) {
      |                                        ^~~~~~~~~~~~~~~~~~~~~~~~
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp: In member function 'void MyServerCallbacks::onConnect(BLEServer*, int*)':
/Users/vunguyen/Documents/Arduino/libraries/phyphox_BLE/src/phyphoxBLE_ESP32.cpp:108:40: error: request for member 'connect' in '* param', which is of non-class type 'int'
  108 |      pServer->updateConnParams(param->connect.remote_bda,PhyphoxBLE::minConInterval,PhyphoxBLE::maxConInterval,PhyphoxBLE:ConfusedlaveLatency,PhyphoxBLE::timeout);
      |                                        ^~~~~~~
exit status 1]]> <![CDATA[zero timestamps in exported data]]> https://phyphox.org/forums/showthread.php?tid=2171 Fri, 25 Jul 2025 14:45:13 +0000 markd]]> https://phyphox.org/forums/showthread.php?tid=2171 I did some recording with accelerometer then exported the data, but the first some 1k lines have 'Time (s)' col all zero, though the sensor is yielding data. Tried a few times with same results.
Burst length in pict is some 700ms.
The START system-time in metadata seems consistent with the 1st record rather than with the 1st non-zero-time line, checking with external reference clock (generator sync'd with the phone).

app version is 1.1.16 on Android6.1

any clues?

thanx


.png   Img 2025-07-25 162156.png (Size: 60.74 KB / Downloads: 296) ]]> I did some recording with accelerometer then exported the data, but the first some 1k lines have 'Time (s)' col all zero, though the sensor is yielding data. Tried a few times with same results.
Burst length in pict is some 700ms.
The START system-time in metadata seems consistent with the 1st record rather than with the 1st non-zero-time line, checking with external reference clock (generator sync'd with the phone).

app version is 1.1.16 on Android6.1

any clues?

thanx


.png   Img 2025-07-25 162156.png (Size: 60.74 KB / Downloads: 296) ]]> <![CDATA[send mqtt command versus device]]> https://phyphox.org/forums/showthread.php?tid=2151 Fri, 06 Jun 2025 07:49:35 +0000 matc1]]> https://phyphox.org/forums/showthread.php?tid=2151
<connection address="MYSERVERIP:1883" autoConnect="true" interval="1" service="mqtt/json" receiveTopic="fancySensor/value" sendTopic="sensorlogger/data" id="test" privacy="https://phyphox.org/disclaimer/" conversion="json">
        <send id="x" type="buffer" datatype="number">accX</send>
        <send id="y" type="buffer" datatype="number">accY</send>
        <send id="z" type="buffer" datatype="number">accZ</send>
    </connection>

Is it possible via mqtt topic to send "start" and "stop" command to the device, like get command 

http://DEVICEIP:8080/control?cmd=start

http://DEVICEIP:8080/control?cmd=stop

I need to send data via receiveTopic?

My device is an Iphone

Is it possible to have an examples?

Thanks]]>
<connection address="MYSERVERIP:1883" autoConnect="true" interval="1" service="mqtt/json" receiveTopic="fancySensor/value" sendTopic="sensorlogger/data" id="test" privacy="https://phyphox.org/disclaimer/" conversion="json">
        <send id="x" type="buffer" datatype="number">accX</send>
        <send id="y" type="buffer" datatype="number">accY</send>
        <send id="z" type="buffer" datatype="number">accZ</send>
    </connection>

Is it possible via mqtt topic to send "start" and "stop" command to the device, like get command 

http://DEVICEIP:8080/control?cmd=start

http://DEVICEIP:8080/control?cmd=stop

I need to send data via receiveTopic?

My device is an Iphone

Is it possible to have an examples?

Thanks]]> <![CDATA[Send device sensor data to external http server]]> https://phyphox.org/forums/showthread.php?tid=2150 Tue, 03 Jun 2025 12:14:34 +0000 matc1]]> https://phyphox.org/forums/showthread.php?tid=2150
I have a question: 

i created a test experiment and i inserted the following "lines" in phyphox  configuration file to receive data from the device spontaneously to an external web server:

<network>
<connection id="gps_stream" service="http/post" address="https://www.testdemo.com/" interval="15">
<send id="accX" type="buffer" datatype="number" keep="false">accX</send>
<send id="accY" type="buffer" datatype="number" keep="false">accY</send>
<send id="accZ" type="buffer" datatype="number" keep="false">accZ</send>
<send id="acc" type="buffer" datatype="number" keep="false">acc</send>
</connection>
</network>

It works perfectly. I receive data on my exposed web site.

My problem is that if I replace address="https://www.testdemo.com/" with an internal network address I get a connection error from the "phyphox" application.

Example address="http//10.1.1.100/" (the mobile is in the same network and has ip 10.1.1.202)

Is there any limitation to the use of internal network addresses on the phyphox application side? 

I use an iPhone 13 on which I installed phyphox. 

Thank you.]]>
I have a question: 

i created a test experiment and i inserted the following "lines" in phyphox  configuration file to receive data from the device spontaneously to an external web server:

<network>
<connection id="gps_stream" service="http/post" address="https://www.testdemo.com/" interval="15">
<send id="accX" type="buffer" datatype="number" keep="false">accX</send>
<send id="accY" type="buffer" datatype="number" keep="false">accY</send>
<send id="accZ" type="buffer" datatype="number" keep="false">accZ</send>
<send id="acc" type="buffer" datatype="number" keep="false">acc</send>
</connection>
</network>

It works perfectly. I receive data on my exposed web site.

My problem is that if I replace address="https://www.testdemo.com/" with an internal network address I get a connection error from the "phyphox" application.

Example address="http//10.1.1.100/" (the mobile is in the same network and has ip 10.1.1.202)

Is there any limitation to the use of internal network addresses on the phyphox application side? 

I use an iPhone 13 on which I installed phyphox. 

Thank you.]]> <![CDATA[problem with esp32-c3-mini-1]]> https://phyphox.org/forums/showthread.php?tid=2122 Tue, 08 Apr 2025 09:39:56 +0000 steplab]]> https://phyphox.org/forums/showthread.php?tid=2122
when i try to connect to the device i receive this error message:
Bluetooth experiment error
The transmitted experiment data  is 
corrupted ( could not write  descriptor)

with other version of ESP32 ( e.g. S3) everithing works fine.

any idea ?]]>
when i try to connect to the device i receive this error message:
Bluetooth experiment error
The transmitted experiment data  is 
corrupted ( could not write  descriptor)

with other version of ESP32 ( e.g. S3) everithing works fine.

any idea ?]]> <![CDATA[How to use movingaverage]]> https://phyphox.org/forums/showthread.php?tid=2119 Mon, 31 Mar 2025 15:31:54 +0000 SiFreZi]]> https://phyphox.org/forums/showthread.php?tid=2119
I am trying to use the movingaverage function and am constantly failing.
I have no clue how that function should work.
Can someone please post a simple example?
My not working code looks like this:
Code:
<phyphox xmlns="https://phyphox.org/xml" version="1.18">   <title>New Experiment</title>   <category>No Category</category>   <data-containers>     <container size="0">x</container>     <container size="0">xAvg</container>   </data-containers>   <input>     <sensor type="linear_acceleration">       <output component="x">x</output>     </sensor>   </input>   <analysis>     <movingaverage>       <input as="data">x</input>       <input as="width" type="value">10</input>       <output as="data">xAvg</output>     </movingaverage>   </analysis>   <views>     <view label="New View">       <value label="xAvg">         <input>xAvg</input>       </value>     </view>   </views> </phyphox>
]]>
I am trying to use the movingaverage function and am constantly failing.
I have no clue how that function should work.
Can someone please post a simple example?
My not working code looks like this:
Code:
<phyphox xmlns="https://phyphox.org/xml" version="1.18">   <title>New Experiment</title>   <category>No Category</category>   <data-containers>     <container size="0">x</container>     <container size="0">xAvg</container>   </data-containers>   <input>     <sensor type="linear_acceleration">       <output component="x">x</output>     </sensor>   </input>   <analysis>     <movingaverage>       <input as="data">x</input>       <input as="width" type="value">10</input>       <output as="data">xAvg</output>     </movingaverage>   </analysis>   <views>     <view label="New View">       <value label="xAvg">         <input>xAvg</input>       </value>     </view>   </views> </phyphox>
]]> <![CDATA[Wrong Unit in "Zentripetalbeschleunigung"]]> https://phyphox.org/forums/showthread.php?tid=2098 Mon, 03 Mar 2025 11:49:45 +0000 Beeblebrox-ZZ9]]> https://phyphox.org/forums/showthread.php?tid=2098
thanks for your great app. I have just a small bug to report. Isn't there a wrong unit in "Zentripetalbeschleunigung" -> "Quadratische Auftragung"? I think it should be "(rad/s)^2" instead of "(rad/s^2)".

Greetings

Beeblebrox-ZZ9]]>
thanks for your great app. I have just a small bug to report. Isn't there a wrong unit in "Zentripetalbeschleunigung" -> "Quadratische Auftragung"? I think it should be "(rad/s)^2" instead of "(rad/s^2)".

Greetings

Beeblebrox-ZZ9]]> <![CDATA[Problem getting <network> to save and get send messages to my web server]]> https://phyphox.org/forums/showthread.php?tid=2093 Fri, 07 Feb 2025 23:11:13 +0000 kencottrell]]> https://phyphox.org/forums/showthread.php?tid=2093
I've editted the .phyphox file to include this entry, then loaded into a new experiment and used QR to create my new experiment. However I do not see the network block in the generated XML nor do I see any updates to <>/config output. Can you see anything wrong?
...
<network>
<connection id="gps_stream" service="http/post" address="http:---.---.---.---/sensor-data" interval="1">
<send id="gps_latitude" type="buffer" datatype="number" keep="false">lat</send>
<send id="gps_longitude" type="buffer" datatype="number" keep="false">lon</send>
<send id="gps_longitude" type="buffer" datatype="number" keep="false">z</send>
</connection>
</network>
...

.phyphox   Kens 250207 GPS.phyphox (Size: 10.97 KB / Downloads: 399) ]]>
I've editted the .phyphox file to include this entry, then loaded into a new experiment and used QR to create my new experiment. However I do not see the network block in the generated XML nor do I see any updates to <>/config output. Can you see anything wrong?
...
<network>
<connection id="gps_stream" service="http/post" address="http:---.---.---.---/sensor-data" interval="1">
<send id="gps_latitude" type="buffer" datatype="number" keep="false">lat</send>
<send id="gps_longitude" type="buffer" datatype="number" keep="false">lon</send>
<send id="gps_longitude" type="buffer" datatype="number" keep="false">z</send>
</connection>
</network>
...

.phyphox   Kens 250207 GPS.phyphox (Size: 10.97 KB / Downloads: 399) ]]> <![CDATA[IOS build instructions]]> https://phyphox.org/forums/showthread.php?tid=2090 Sun, 02 Feb 2025 17:30:45 +0000 nike_nr]]> https://phyphox.org/forums/showthread.php?tid=2090
Are there build instructions?

Huh]]>
Are there build instructions?

Huh]]> <![CDATA[Missing JXLS and ZipZap frameworks, in Xcode]]> https://phyphox.org/forums/showthread.php?tid=2089 Sun, 02 Feb 2025 05:28:25 +0000 nike_nr]]> https://phyphox.org/forums/showthread.php?tid=2089
Hints?]]>
Hints?]]> <![CDATA[Values of the acceleration]]> https://phyphox.org/forums/showthread.php?tid=2087 Fri, 31 Jan 2025 10:32:32 +0000 Mamboleoo]]> https://phyphox.org/forums/showthread.php?tid=2087 I'm currently working on a lesson for my computer science class with my students to explore all the sensors available in a phone.
I'm trying to understand how the acceleration values from my graph.
My experiment is to drop my phone from 1.5m up and to check the values of the acceleration.
In attachment you cans see I'm having two high positive values that are matching the two falls from different heights (second one is higher).

My question is why is my phoning detecting a positive acceleration of >60m/s² as the phone shouldn't really accelerate more than the gravity (9.81m/s²).
From what I concluded, the high value corresponds to when my phone hits the ground (blanket), but why does the phone captures an acceleration.

Sorry if this is more of a general science question than about the phone, but I'm having trouble understanding the results here.
Thank you for your help!


.png   IMG_1200.PNG (Size: 185.92 KB / Downloads: 705) ]]> I'm currently working on a lesson for my computer science class with my students to explore all the sensors available in a phone.
I'm trying to understand how the acceleration values from my graph.
My experiment is to drop my phone from 1.5m up and to check the values of the acceleration.
In attachment you cans see I'm having two high positive values that are matching the two falls from different heights (second one is higher).

My question is why is my phoning detecting a positive acceleration of >60m/s² as the phone shouldn't really accelerate more than the gravity (9.81m/s²).
From what I concluded, the high value corresponds to when my phone hits the ground (blanket), but why does the phone captures an acceleration.

Sorry if this is more of a general science question than about the phone, but I'm having trouble understanding the results here.
Thank you for your help!


.png   IMG_1200.PNG (Size: 185.92 KB / Downloads: 705) ]]>