Vermes
Advanced Member level 4
It is a design of a start board. Elements of the board are listed in the list below:
- Atmega32 + pins for a module with another processor
- LCD display HD44780
- 4x 7segment WA display
- matrix keyboard 4x4
- RTC PCF8583
- EEPROM 24cXX
- reference voltage for TL431
- ULN2803
- SD card connector
- phototransistor
- buzzer
- 6x LED
- USB connector
- 5V and 3V power supply
- pulser and potentiometer (not soldered)
One sided board with dimensions of 29x18cm with approximately 750 holes. There are few SMD elements on the PCB, the rest THT. The board was designed in Eagle, made in thermal transfer method. After applying description layer, the board was covered with two layers of clear lacquer.
By default, Atmega32 is on the board, but using modules, you can use another processor, not necessarily AVR.
Keyboard, LCD displays and LED can be connected to the processor by dip switches. It is a very convenient solution, inspired by test boards for PIC. Displays and keyboard can be simultaneously plugged into a microcontroller. Ports PB0-PB7 are free. The set can be powered from built in 5V stabilizer or USB port. Additionally, there is a 3V stabilizer on the board, providing supply of the memory card.
Pictures:
Link to original thread (useful attachment) - Prosta płytka startowa AVR