A digital clock using the AVR ATMega16 (or ATMega32) and DS-1307 RTC that is set using a UART connection to a computer, the time is got from the computer clock and is sent using a GUI application. You can also set and clear an alarm using the GUI application. The firmware doesn't use an RTOS but rather a foreground-background architecture with sleep mode to conserve power.
- Display current time and date including day of the week.
- Alarm functionality, and keeping the alarm in internal EEPROM.
- Display a message that an alarm is set, even if the system is reset before the alarm event takes place.
- When an alarm event happens, a pin is toggled for a minute. Then the alarm notification disappears from the LCD.
- Stopwatch functionality, controlled by GUI or physical button connected to external interrupt pin.
- Set current current time, date and alarm via GUI application.
- Get temperature of a city (name in python code) from the web, and send it to MCU.
- Clear LCD screen with GUI.
- GUI is working on both Linux and Windows.
- Utilizing sleep mode of AVR MCU to conserve power.
The packages python3-tk, pyserial should be installed. tk is used to make the GUI and pyserial is used for UART communication by the GUI app.
Install pyserial by: pip3 install pyserial
Just put the files of the project in one folder/directory, and then run make build from the command line.
Assuming avr-dude is installed on your system, you can run make load to load the program into the MCU.
You can turn the Python script into a standalone application using pyinstaller --onefile --noconsole -n "DigitalClock GUI" gui.py.
Adding cycling of baudrate via external interrupt.
| LCD pin | AVR pin |
|---|---|
| D0 | PB0 |
| D1 | PB1 |
| D2 | PB2 |
| D3 | PB3 |
| D4 | PB4 |
| D5 | PB5 |
| D6 | PB6 |
| D7 | PB7 |
| RS | PD3 |
| RW | PD4 |
| En | PD5 |
| USB-TTL | AVR pin |
|---|---|
| Tx | PD0 (Rx) |
| Rx | PD1 (Tx) |
| LED | AVR pin |
|---|---|
| Anode | PA3 |
