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1  Using Arduino / Networking, Protocols, and Devices / Re: Using AT commands to get time from NTP server? on: February 23, 2013, 03:35:43 am
with sim900 you can update time from the cellular network automatically at startup ,

follow these steps,
Code:
AT+CLTS=1\r
AT+CENG=3\r

after this on every attachment with network you will get
Code:
*PSUTTZ: 2013, 2, 23, 8, 22, 51, "+16", 1

DST: 1

*PSUTTZ: 2013, 2, 23, 8, 22, 54, "+16", 0

DST: 0

and the local time stamp will be updated to local time
check by command
Code:
AT+CCLK?
2  Using Arduino / Audio / Noise in audio if I feed audio (PWM output from an audio module) to mic on: November 26, 2012, 01:13:19 am
I am feeding audio from a Sound module wtv020sd-mini which is PWM , to the mic Pins of My GSM Module Sim900, when I hear this sound on a a speaker although its not a high quality still its fair enough, but when I play the same voice and feed it to Sim900 mic and listen to it over a call its quality is very poor, there are alot of humming sounds and voice quality itself is also low.

I wanna use the module for voice response to callers , Is it all because of PWM output ? I used another module from ISD17150 and its voice quality is very nice even on the call.
3  Using Arduino / Audio / Re: cheap sound module: what version is this? on: November 26, 2012, 01:10:31 am
I am feeding audio from a Sound module wtv020sd-mini which is PWM , to the mic Pins of My GSM Module Sim900, when I hear this sound on a a speaker although its not a high quality still its fair enough, but when I play the same voice and feed it to Sim900 mic and listen to it over a call its quality is very poor, there are alot of humming sounds and voice quality itself is also low.

I wanna use the module for voice response to callers , Is it all because of PWM output ? I used another module from ISD17150 and its voice quality is very nice even on the call.
4  Using Arduino / Audio / Re: Arduino library for WTV020-SD-16P audio module on: November 19, 2012, 01:56:57 am
I am running it on 5V supply without changing the jumper , and using 2 diodes.
5  Using Arduino / Audio / Re: Arduino library for WTV020-SD-16P audio module on: November 12, 2012, 02:39:00 am

FAT formatted on windows 7
File is named 0.ad4, and located in the root directory





use the sd card formatter utility, and rename the file as 0000.ad4

first try to use the ad4 files that have been tested by others , it will help u
6  Using Arduino / LEDs and Multiplexing / Re: Transistor as switch for battery powered laser pointer on: December 12, 2011, 02:06:05 am
I would suggest you have some reading for "using transistor as switches" Googling would give u a lot of good resources...

check this for instance http://teeblog.blog.com/archives/746/
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