The voltage for Logical "0 "is 0 volt or 5 volt?The voltage for logical "1"?I want make serial communication with mobile phone sony ericsson k700i.My phone Tx is always 2,7 volt and Rx is 0 volt with no command.Any idea?
The DC voltage for a high (1) is 5V.
However, if the pin is transmitting it means the signal is toggling 0 to 5 to 0. On average, this means you would measure a DC voltage of 2.5V. It is not surprising you see 2.7V.
You really an oscilloscope to see the full voltage.
I make serial comunication Arduino Mega328 with mobile phone Sony Ericsson K700i.I test it with serial monitor.Send "AT" and reply "O","K".How i read a sms for control a led on/off?Could reset the pdu mode and use text mode for this phone or support only PDU mode?
Hi i make the code for communication Arduino and Sony Ericsson K700i.....
char incomingByte;
void setup(){
delay(10000);
Serial.begin(9600);
delay(3000);
Serial.println("AT+CPMS=\"ME\",\"SM\"");
delay(6000);
Serial.println("AT+CMGR=1");
//Serial.println("AT+CMGD=1");
delay(6000);
}
void loop(){
delay(3000);
if (Serial.available()>0){
incomingByte=Serial.read(),BYTE;
Serial.println(incomingByte);
}
}
I have problem with reply sms display pdu only phone number and date ,time no text ....