interface keypad with sim900 and pic18f4550

[moahmed ragab]

hello sir,
Kindly find below:
i'm programming a code by pic 18f4550 with sim 900 GSM using Mikroc pro.
1- I want to interface full keypad or interface two buttons to enter characters and numbers.
so i want to know how make the two conditions (software-hardware).
2-I want to interface microphone with the sim 900.
so i want to know how make this (software-hardware).


Best Regards,
Mohamed Ragab

 

[salmanliaquat]

1- I want to interface full keypad or interface two buttons to enter characters and numbers.
so i want to know how make the two conditions (software-hardware).

Ans: https://tutorial.cytron.com.my/2012/08/15/project-17-%E2%80%93-interface-with-4x4-keypad-and-2x16-lcd/

I want to interface microphone with the sim 900.
so i want to know how make this (software-hardware).

Consult Sim900 Datasheet for hardware connection of microphone. you don't need to write any software for this. Sim900 will automatically handle the software.