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Hall Sensor

OP sanris

18th August 2013, 10:28 AM   |  #1  
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I am working on a project with Hall Sensor in Samsung Galaxy S4. It works fine but the problem is i dont know how to use the sensors for realtime apps except smart sview. If you post the idea's then we can use my hall sensor class with the activity app to create variety of apps.

Also i want to know how much magnetic force needed to activate sensor. i dont want to damage my sensor with power full magnet while testing. and couple of ideas to get low power magnets from which toys suitable for this project.
Last edited by sanris; 18th August 2013 at 10:38 AM. Reason: updates
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18th August 2013, 11:29 AM   |  #2  
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Quote:
Originally Posted by sanris

I am working on a project with Hall Sensor in Samsung Galaxy S4. It works fine but the problem is i dont know how to use the sensors for realtime apps except smart sview. If you post the idea's then we can use my hall sensor class with the activity app to create variety of apps.

Also i want to know how much magnetic force needed to activate sensor. i dont want to damage my sensor with power full magnet while testing. and couple of ideas to get low power magnets from which toys suitable for this project.


Hi since i am seeing you working with the hall sensor, hope you can solve or suggest whats wrong in my GTi9500 India version. the S-view display comes by itself, when i am just holding the phone in my hand[ without the actual S-view cover].

Details.
My GTi9500 is just having its own back cover, nothing extra,

when i make a call and hold the phone in my hand, i can see the call screen of the s-view mode flashing for a brief and then goes back to normal. i understand that the sensor is right below the volume button, and when i am holding this area with my hand i can see this s-view display flicker.

it also happened couple of times in app drawer screen and the stock browser screen.

my phone is complete stock, i havent rooted it and changed the rom/kernel/modem.

have run the diagnostics via *#0*# Diagmode

am seeing the sensor test results are PASS>

so how can i solve this. or is this a hardware issue and do i go for a repair?
18th August 2013, 11:53 AM   |  #3  
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First you need to confirm whether the problem occurs when phone in a wooden table without surrounding by magnetic flux. Just find a better place with very magnetic field, etc and put in a wooden table and confirm whether it changes or not. In couple of days, i will release the hall sensor monitor. you can use it too to find it instead of looking into phone for long time.


Second, if it happens only in hand, then
if you wearing any magnet rings or other iron (may magnetized by flux), etc then remove it then operate the phone and confirm whether your problem is solved or not.

Hall Sensor, is a very sensitive sensor which is just below the volume buttons and few mm away from edge.
Hall Sensor working based on sensitive magnetic flux attraction. (not sure whether its south pole or north pole. i dont have testing magnet with pole identifications)
Hall Sensor activates automatically if the magnetic field is > xx (minimum) level. In S-View cover, its very very tiny magnet not easy to notice by novice users. so your phone may act abnormal when you using your rings, bracelets, etc.

--
if your phone works abnormally when in isolated wooden table and there is no high radiation towers near you then its hardware defect. you need to contact customer care service centre.
19th August 2013, 05:57 AM   |  #4  
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Quote:
Originally Posted by sanris

First you need to confirm whether the problem occurs when phone in a wooden table without surrounding by magnetic flux. Just find a better place with very magnetic field, etc and put in a wooden table and confirm whether it changes or not. In couple of days, i will release the hall sensor monitor. you can use it too to find it instead of looking into phone for long time.


Second, if it happens only in hand, then
if you wearing any magnet rings or other iron (may magnetized by flux), etc then remove it then operate the phone and confirm whether your problem is solved or not.

Hall Sensor, is a very sensitive sensor which is just below the volume buttons and few mm away from edge.
Hall Sensor working based on sensitive magnetic flux attraction. (not sure whether its south pole or north pole. i dont have testing magnet with pole identifications)
Hall Sensor activates automatically if the magnetic field is > xx (minimum) level. In S-View cover, its very very tiny magnet not easy to notice by novice users. so your phone may act abnormal when you using your rings, bracelets, etc.

--
if your phone works abnormally when in isolated wooden table and there is no high radiation towers near you then its hardware defect. you need to contact customer care service centre.

Thanks for your feedback, lemme try this and comeback...
13th September 2013, 04:46 PM   |  #5  
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Still issues
Quote:
Originally Posted by ksenthi5

Thanks for your feedback, lemme try this and comeback...

Hi, the problem still persisted even when the phone is just in the wooden table, hence i went to service center and they changed the mother board.
[not sure whether the sensor gets changed with this], as the executives don't even have knowledge of sensors...

but with the new board also am facing the same problem.

note: i owned a S4 for three months prior to this, and was walking.using, working in the same environment. and with same environment am still there. but facing this issue only in the new phone...

what shall i do... force to get my phone replaced?????
15th September 2013, 12:32 AM   |  #6  
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Contact customer care online and submit a complaint about malfunction of Hall sensor as well as problem persist after changing motherboard. Then go to customer care with the online complaint and ask them to replace hall sensor.

Sent from my GT-I9500 using XDA Premium 4 mobile app
15th September 2013, 06:02 AM   |  #7  
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Quote:
Originally Posted by sanris

Contact customer care online and submit a complaint about malfunction of Hall sensor as well as problem persist after changing motherboard. Then go to customer care with the online complaint and ask them to replace hall sensor.

Sent from my GT-I9500 using XDA Premium 4 mobile app


As am not so novice on Hardware, when you ask me to request the service technician to change the hall sensor, even after changing the motherboard, do you mean that the Change of board doesnt constitute hall sensor change?.

is that a seperate entity
15th September 2013, 05:56 PM   |  #8  
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Quote:
Originally Posted by ksenthi5

As am not so novice on Hardware, when you ask me to request the service technician to change the hall sensor, even after changing the motherboard, do you mean that the Change of board doesnt constitute hall sensor change?.

is that a seperate entity

samsung replace the phone only if problem unable to resolve after changing parts several times. thats why i told you like that.

there is only three kind of problems.
1. sensors not working properly
2. sensors working properly but sensorhub ic(u805) or corresponding ic unable to process values from sensor and fail to send further.
3. environment makes the sensor work ubnormaly.

in motherboard it has most of sensors as well as ic's u805 , u807 & u600 .
in small piece of pcb in bottom have humidity and temperature sensors which feed data to the above ic's.
few sensors may not directly in motherboard and feed data to motherboard.

i just want to know few things
1. whats your exact problem ? (screen goes blank sometimes or do you see the mini window ). screen goes blank in two situations. 1) when samsung service receive DOOR_CLOSED event from hall sensor , 2) proximity sensor detect close objects and during call (by software program) it turn off display.
2. settings > My Device > Accessory > S View Cover - make sure this setting is disabled for you.
3. how you checked your hall sensor is malfunctioning ?

----------------------------------------------
To activate hallsensor

SIMPLY USE MAGNETIC SCREW DRIVER . see the snapshots


also pls send your email id to me in PM, i will send you some reference materials and circuits. so you can understand better.
Last edited by sanris; 15th September 2013 at 06:13 PM.
15th September 2013, 06:16 PM   |  #9  
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Quote:
Originally Posted by sanris

samsung replace the phone only if problem unable to resolve after changing parts several times. thats why i told you like that.

there is only three kind of problems.
1. sensors not working properly
2. sensors working properly but sensorhub ic(u805) or corresponding ic unable to process values from sensor and fail to send further.
3. environment makes the sensor work ubnormaly.

in motherboard it has most of sensors as well as ic's u805 , u807 & u600 .
in small piece of pcb in bottom have humidity and temperature sensors which feed data to the above ic's.
few sensors may not directly in motherboard and feed data to motherboard.

i just want to know few things
1. whats your exact problem ? (screen goes blank sometimes or do you see the mini window ). screen goes blank in two situations. 1) when samsung service receive DOOR_CLOSED event from hall sensor , 2) proximity sensor detect close objects and during call (by software program) it turn off display.
2. settings > My Device > Accessory > S View Cover - make sure this setting is disabled for you.
3. how you checked your hall sensor is malfunctioning ?

----------------------------------------------
To activate hallsensor

SIMPLY USE MAGNETIC SCREW DRIVER . see the snapshots


also pls send your email id to me in PM, i will send you some reference materials and circuits. so you can understand better.

see the photos to generate sviewcover door close event
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15th September 2013, 06:22 PM   |  #10  
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sorry, i just read your first message again. your problem definetly related with hallsensor (if actually available). other wise its related to magnetic sensor. i will open my s4 and confirm you whether hall sensor is in motherboard or separated OR magnetic sensor acting as a hall sensor.

problem is only with hall sensor or sensorhub ic u805. you can also check whether the aluminium frame magnetized or not by using a iron piece. and try to turn off the S View Cover feature in my display> acc... like i mentioned in previous post.

for hall sensor testing, i almost finished my new android app, i will publish it and upload into xda soon. its running as a service+activity (b'cause. when doorcloses the activity get freezed and unable to log status. it log status again only after phone wakes. so i wrote part of sensor readings in service and display report in activity) and log the status when ever the door event raises. i mean Doorclosed/DoorOpen. and you need to open the application activity and see the report with timings and door state changes.
Last edited by sanris; 15th September 2013 at 06:29 PM.

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