after interfacing the sim808with the aruino uno there is no pins left to provide a tigger to the arduino..what must be done in this case ?? i need to have a pin of ardiono for programming the sim808...please help...!!
I don't know the answer. But how could someone who does guess what your problem is from your Title?
If you edit your Original Post you can change the title to something useful - such as "Sim808 uses all my pins"
Also, you need to post the datasheet for your Sim808 and explain what you are trying to acheive.
Do you really mean that the Sim808 has connected to every one of the pins on your Uno?
And if you have a program, please post it.
...R
