Atmega DS1307 Bluetooth

Connection between Bluetooth and Atmega8

Atmega Pin	Bluetooth Pin
TXD	Rx
RXD	Tx

Connection between DS1307 and Atmega8

Atmega Pin	DS1307 Pin
SCL	SCL
SDA	SDA

Switches

Connect push buttons as shown in the Proteus schematic file.

Working

Under Normal cases the program skips the time setting part and goes to the infinite while loop.

while (1)
{
  /* Do your work here*/
}

But when PIND7 is pressed while Resetting the UART code gets executed.

USART_Initialise(USART_Character_Size_8|USART_Tx_Enable|USART_Rx_Enable);
while (1)
{
  while (USART_Status_Flag & USART_Tx_Busy){}
  USART_Transmit("\r\n1.SetTime\r\n2.ShowTime\r\n3.Exit\r\n>>",36);
  USART_Receive(cmd,1);
  while (USART_Status_Flag & USART_Rx_Busy){}

  if(cmd[0]== '1'){
    USART_Transmit("\r\nSetTime as HH MM SS\r\n>>",24);
    USART_Receive(cmd,8);
    while (USART_Status_Flag & USART_Rx_Busy){}
    cmd[9]=0;

    sscanf(cmd,"%d %d %d",&hour,&min,&sec);

    DS1307_Read_Time(&time);
    time.hour=hour; time.min=min; time.sec=sec;
    DS1307_Set_Time(&time);
    USART_Transmit("Time Set",8);
  }
  else if(cmd[0]== '2'){
    DS1307_Read_Time(&time);
    sprintf(cmd,"\r\n%02d:%02d:%02d\r\n",time.hour,time.min,time.sec);
    USART_Transmit(cmd,12);
  }
  else if(cmd[0]== '3'){
    USART_Transmit("Exiting",7);
    break;
  }
}

Serial Bluetooth

1. Install any Bluetooth Serial app in your mobile phone.
   • We tested with Arduino Bluetooth Controller App
2. Connect to the Bluetooth module.
3. Reset the Controller while pressing the PIND7 button. You will be presented with the command text.