I got a BenQ Gsm Modem, so far I got it running sending AT commands from PC to GSM module via hyperterminal using USB to serial converter. The GSM module is operates in 3.3v, Pic16F628A on 5v.
1.] Obviously I going to need a voltage divider between the module and PIC, but how can I or can Imake Pic16F628A operate on a 3.3v, based on the datasheet in can operates 2.0-5.5v
2.] I want to try using the following setup connection(refer to the attach image) and the code below..
Where it simply waits for 'OK'. Can I use PortC.6 (with max232) to COM Port at the same time?
Include "modedefs.bas" ' Include serial modes
DEFINE OSC 4 'for 4 Mhz
'DEFINE OSC 8 'for 8 Mhz
DEFINE HSER_TXSTA 20h 'hardware assign
DEFINE HSER_RCSTA 90h '
DEFINE HSER_BAUD 9600 'for 9600 Baud rate
DEFINE HSER_SPBRG 12 '
DEFINE HSER_CLROERR 1 '
' Send signal tp PWON
HSEROUT ["AT",13] 'Send AT to modem followed by a CR
HSERIN 5000, start, [WAIT("OK")] ' wait 5sec to reply.