I'm a student and having a project that using an ATmega8-16PU to control simple alarm (just LED and Buzzer) with SMS (using a Sony Ericsson K508i as a GSM module). Refer to this link
I have questions :
- Should i use internal 8Mhz or an extra external 8Mhz crystal for 9600 Baud Rate ? I had read before that better not to use internal clock.
- It says to use a phone-RS232 cable (cut off the plug and connect the wires), but can i just directly connect the phone Tx Rx pins to ATmega8 Rx Tx pins ?
Please Help, I'm a software engineering student and have minimal hardware knowledge. This is my first time working with microcontroller.