interfacing keypad with sim300 module

Projects General Guidance
1

hi

i am using sim300 gsm/gprs module for my project......i want to use the keypad pins of sim300 to write, send messages and to enter number.so i want to know how can i do this.....please help

thanks

2

Hi,

From section 3.13 of the SIM300 datasheet it describes the keypad interface as having 5 rows and 5 columns - therefore it can talk to up to 25 keys in a matrix setup. However there's a note there too:

Note: This function is not supported in the default firmware. There must be special firmware if you want. Please contact SIMCom for more details.

Presuming you have a matrix keyboard, the alternative would be to drive that from your Arduino and send those commands back to your module. There's a Arduino playground tutorial on how to get a matrix keypad up and running with the provided library.

Cheers ! Geoff