Here is how mine works
I mean my version of SMS Control
Device will switch on LED 1 when "On 1" is received and will automatically reply with "1 On" as confirmation also for "Off 1" would be replied with "1 Off".
Maxim 3222 can be removed by directly connecting Zilog Encore UART RX/TX to 3310 FBUS RX/TX.
LED beside voltage regulator indicates cellphone responding FBUS communication.
Can be also programmed to control as many MCU I/O available.
Any SIM can be used, device will reply to whoever sends the right keyword.
I can't connect nokia 3310 to atmega32 microcontroler. how to caonnect it. please help me. please attach schematic of nokia 3310 fbus serial cable and microcontroller serial port