All Connection:
GSM
TX of GSM module -------digital pin 2 of Arduino
RX of GSM module -------digital pin 3 of Arduino
GND of GSM module -------GND of Arduino
SPP pin of GSM module ------ speaker positive
SPN pin of GSM --------- speaker negitive
MCP pin of GSM ------- microphone positive
MCN pin of GSM ------- microphone negitive
KEYBOARD
pin 1 ---- pin 11 of Arduino
pin 2 ---- pin 10 of Arduino
pin 3 ---- pin 9 of Arduino
pin 4 ---- pin 8 of Arduino
pin 5 ---- pin 7 of Arduino
pin 6 ---- pin 6 of Arduino
pin 7 ---- pin 5 of Arduino
pin 8 ---- pin 4 of Arduino
GSM connection:
Download Programming and Circuit click......
Demo Video:
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