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Author Topic: GSM modem interfacing - - which one is better?  (Read 3355 times)

Offline marcelino

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GSM modem interfacing - - which one is better?
« on: December 16, 2009, 07:58:42 PM »
If i am to automate something, alin ang mas magandang implementation?

1. cheap USB 3G/GSM modems (like that of Globe Tattoo) + USB PIC
 (i think this one is quite complicated - however yung modem like sa smart 995pesos nalang)
or

2. expensive GSM modem + simple uart interfacing with any PIC
 (simple, implementation will surely be fast yet expensive modem, medyo bulky pa)

Tanong ko na din, anong class ang gagamitin kung sakaling option 1?
actually i am thinking of option 1 kasi di na din kamahalan ang USB PIC (magkano ba ang pic18F2550 sa e-gizmo? hehehe ;D ).

GSM-SMS project thingy nanaman pala to. data acquisition.
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GSM modem interfacing - - which one is better?
« on: December 16, 2009, 07:58:42 PM »

Offline rdpzycho

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Re: GSM modem interfacing - - which one is better?
« Reply #1 on: December 16, 2009, 08:04:33 PM »
option 2. kahit may USB sa 1 sis, kailangang i-code 'yung driver na ginamit niya sa Windows para doon sa modem. simple lang kung specific ang gamit niya, pero kung sarili niyang gawa, sakit sa ulo. ;D
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Re: GSM modem interfacing - - which one is better?
« Reply #1 on: December 16, 2009, 08:04:33 PM »

Offline marcelino

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Re: GSM modem interfacing - - which one is better?
« Reply #2 on: December 16, 2009, 08:10:04 PM »
Quote from: rdpzycho on December 16, 2009, 08:04:33 PM
option 2. kahit may USB sa 1 sis, kailangang i-code 'yung driver na ginamit niya sa Windows para doon sa modem. simple lang kung specific ang gamit niya, pero kung sarili niyang gawa, sakit sa ulo. ;D

DRIVER!!!! oo nga pala... yan na ang sagot! hehe... ;D ;D

ibig sabihin nito, aaralin ko din yung circuitry ng modem mismo di ba!

Naisip ko din kasi to (option1) na maging option sa mga projects ng mga students... alam naman natin na laging may project na ganito! heheheh ;D

Thanks... pogi mo!
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Re: GSM modem interfacing - - which one is better?
« Reply #2 on: December 16, 2009, 08:10:04 PM »

Offline Mayalin22

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Re: GSM modem interfacing - - which one is better?
« Reply #3 on: December 16, 2009, 08:11:50 PM »
option 2 din ako  ;D ;D ;D

pd paliitin yan BenQ modem sis... ganon ginawa ko.  :D
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Re: GSM modem interfacing - - which one is better?
« Reply #3 on: December 16, 2009, 08:11:50 PM »

Offline zer0w1ng

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Re: GSM modem interfacing - - which one is better?
« Reply #4 on: December 16, 2009, 08:12:16 PM »
#1 is difficult. The MCU must be a USB host.
And even you have a usb host MCU, you need also to know the USB intricacies.

#2 is much simpler but more expensive.

This is a trade-off between software complexity and cost of hardware.
A choice between paying more the programmer or the chip/hardware manufacturer.
This situation is very common in real-world commercial projects.
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Re: GSM modem interfacing - - which one is better?
« Reply #4 on: December 16, 2009, 08:12:16 PM »

Offline kelvinblank

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Re: GSM modem interfacing - - which one is better?
« Reply #5 on: December 16, 2009, 08:12:52 PM »
galeng
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Offline marcelino

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Re: GSM modem interfacing - - which one is better?
« Reply #6 on: December 16, 2009, 08:21:28 PM »
@coolet, oo medyo alam ko na din na pwede din yun paliitin. interface board lang naman yung malaki. ;D

@sir zer0,
thanks for pointing that out sir. actually, this is leading to a real-world small scale not-much-commercial project.  heheh ;D
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Offline kelvinblank

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Re: GSM modem interfacing - - which one is better?
« Reply #7 on: December 16, 2009, 08:24:19 PM »
gagaling naman
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Offline kraze

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Re: GSM modem interfacing - - which one is better?
« Reply #8 on: December 16, 2009, 08:26:56 PM »
Quote from: kelvinblank on December 16, 2009, 08:24:19 PM
gagaling naman
Correct ka dyan... di rin ako maka relate...
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Offline kelvinblank

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Re: GSM modem interfacing - - which one is better?
« Reply #9 on: December 16, 2009, 08:32:28 PM »
wala na ko masabi e, ung option 2 ung ginamit namin sa thesis namin pero hindi benq, chiptron name nya gawang pinas ata un super cheap my cellphone sa ilalim hahah
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Offline RiDdLeR???

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Re: GSM modem interfacing - - which one is better?
« Reply #10 on: December 16, 2009, 09:04:18 PM »
Baka pwede naman option 1 na lang.  Kailangan lang may maglakas ng loob na buksan yung usb modem nila at sigurado naman na may serial port interface yun sa loob.
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Offline rdpzycho

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Re: GSM modem interfacing - - which one is better?
« Reply #11 on: December 16, 2009, 09:48:18 PM »
meron akong modem na nabuksan (though 'di pang-GSM), diretso sa MPU 'yung USB connection (walang ibang dinaanang IC except for ESD protection) kaya kailangan may documentation na nung firmware kung gagawa ng driver. ang paraan na lang, 'yung driver na gamit for windows ang kalikutin.
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Offline marcelino

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Re: GSM modem interfacing - - which one is better?
« Reply #12 on: December 16, 2009, 10:19:05 PM »
Quote from: rdpzycho on December 16, 2009, 09:48:18 PM
meron akong modem na nabuksan (though 'di pang-GSM), diretso sa MPU 'yung USB connection (walang ibang dinaanang IC except for ESD protection) kaya kailangan may documentation na nung firmware kung gagawa ng driver. ang paraan na lang, 'yung driver na gamit for windows ang kalikutin.

ayoko! hehehe ;D di aabutin ng utak ko sa ngayon... madami pang "babayuhin" na bigas! e magsasaing pa! ;D ;D ;D

Quote from: hunyango on December 16, 2009, 09:04:18 PM
Baka pwede naman option 1 na lang.  Kailangan lang may maglakas ng loob na buksan yung usb modem nila at sigurado naman na may serial port interface yun sa loob.

kung sa lakasan ng loob, malakas ako! heheh ;D wala lang akong bubuksan as of now.
baka may makita tayong schematic, verify nalang natin.
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Offline rdpzycho

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Re: GSM modem interfacing - - which one is better?
« Reply #13 on: December 16, 2009, 10:25:15 PM »
'di ba si manay 7 meron niyan? ;D ;D ;D 'yung sa Globe pa nga pala 2 device siya, isa 'yung flash drive for installation at 'yung modem.

OT: may mouse ako na meron ding internal flash para merong driver kahit saan dalhin (though 'di naman talaga kailangan). ayun, sakit sa ulo, nagha-hang ng madalas 'yung mouse. ;D
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Offline marcelino

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Re: GSM modem interfacing - - which one is better?
« Reply #14 on: December 16, 2009, 10:34:39 PM »
sige nga manay7... patingin. buksan mo na! heheh ;D
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Offline 0b00000111

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Re: GSM modem interfacing - - which one is better?
« Reply #15 on: December 17, 2009, 07:15:51 AM »
option 2. kung PC based, option 1.

gusto ko sanang buksan yung globe tattoo, gusto kong silipin sa mga IC doon baka merong may UART interface doon... hehehe.. pero sayang eh ehehehe...
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Offline RiDdLeR???

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Re: GSM modem interfacing - - which one is better?
« Reply #16 on: December 17, 2009, 08:34:57 AM »
Sigurado meron yan usart i/f dahil ang sim card interface siguradong serial uart yun.  Its just a matter of identifying the uart traces.

Yung zte modem ko binuksan ko na .... meron palang external antenna connector ang zte modem, wala lang opening sa casing.
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Offline rdpzycho

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Re: GSM modem interfacing - - which one is better?
« Reply #17 on: December 17, 2009, 10:42:29 AM »
kung may IC na ginamit for USART, madali lang sana. pero kung tulad nung nabuksan ko diretso sa MPU, hardly no way to tell kung paano niya in-implement 'yung USB to UART unless makuha 'yung original FW or 'yung source ng drivers.
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Offline BANNEDMemberAccount

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Re: GSM modem interfacing - - which one is better?
« Reply #18 on: December 17, 2009, 10:45:17 AM »
grabe mga idol ko kau, simcard reader lang ang kaya kong gawin :)
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Offline kelvinblank

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Re: GSM modem interfacing - - which one is better?
« Reply #19 on: December 17, 2009, 11:02:05 AM »
ako nga blinking led pa lng nagagawa ko using on off switch huhuhuh
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Philippine Electronics Forum

Re: GSM modem interfacing - - which one is better?
« Reply #19 on: December 17, 2009, 11:02:05 AM »
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