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I have problem with GSM module

Yousuf Yamani

Aug 20, 2015
1
Joined
Aug 20, 2015
Messages
1
I have problem with GSM module which as in this site:
http://www.aliexpress.com/item/New-S...282557094.html

The idea of program is when I run the pic the led will light 5 times (i didnt attached this function in the picture), after that when I press the key the GSM will call me, then send a message written on it "testing", but unfortunately the GSM didnt call me:(.

I connected GSM module to the pic16f628a as in the picture

القرية الإلكترونية 1.png
And this the code
القرية الإلكتورنية 2.png

القرية الإلكترونية 3.png

Also I attached the code as a text file.
 

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donkey

Feb 26, 2011
1,301
Joined
Feb 26, 2011
Messages
1,301
might be a good idea to send pic of the project, it could be as simple as a loose wire or sim card not being inserted properly, right through to the wire hookup for the micro or programming
 

jayanthd

Jul 4, 2015
43
Joined
Jul 4, 2015
Messages
43
Hi

The power from a PICKit 3 is not sufficient to power the SIM900. PICKit 3 will be connected to USB of PC and USB can only provide 500 mA current but SIM900 requires 2.5A burst current (100 ms to 200 ms) while sending SMS. I am not sure how much current SIM900 requires when calling but I think even if it requires 200 mA to 300 mA then PICKit3 will not be able to provide it from its USB soucrce. So, use a external power supply (5V) for the SIM900 and try.

One more thing don't forget to debounce your switch in the code.
 
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