Microcontroller › 8051 › Can I do this project? Reed switch + 8051 + GSM module?? › Hi Mohammed,Screen, well its
Screen, well its upto you.
MAX232 is basically a serial to ttl converter. Your controller can read only ttl logic. If your GSM module is communicating with RS232 serial standard, you need a RS232 to ttl converter. MAX232 will do this job.
If you share your circuit shcematic and details, we could help you more.