Atmega8 test board based on ZL2-AVR

[Vermes]

This project was based on ZL2-AVR kit from BTC.

Features:

• display HD44780
• 4x 7-segments display
• 8x LED
• RS232
• I2C
• matrix keyboard 2x2
• PS2 keyboard
• buffers
• potentiometer
• TSOP IR receiver
• sockets for 1wire and 6 sockets for external interfaces
• DIP14 and DIP16 bases

Design:
Schematic diagram was made in EAGLE on base of ZL2-AVR scheme. As you can not place all the peripherals in such a system on one layer, the board was designed as double sided with emphasis on the bottom layer.

Implementation:
The board was made in thermal transfer method with sequentional etching. Remember that the holes of both layers must match perfectly. The description layer is self-adhesive with a laser print.

Assembly:
Guides were made with a thin wire. Make sure that all the guides were made, then stick a foil with a description and make holes for the elements using a needle. The rest of the assembly proceeds normally.

Elements used:

• LCD display 2x16 characters
• AVR microcontroller, DIP28
• 4x 7-segments green displays 0,28 common cathode
• 3x HEADER 1x40
• socket for HEADER 1x40
• 2x HEADER 2x40
• female angle socket DB9 for print
• KF301 connector 3pin (-)
• 7x KF301 connector 2pin (-)
• 5V stabilizer, TO-220
• 28pin precision stand
• 16pin normal stand
• 14pin normal stand
• ceramic capacitor 100nF/50V r5.08
• electrolytic capacitor 0.1uF/50V 5x11 105C
• IR receiver 36 kHz
• etching: sodium persulfate 100g
• 9x 3mm diffusion red LED
• 3x resistor 220R 5% 0,25W
• rectifier bridge 1,5A/1000V
• chip: Interface RS232
• chip expander for line I2C
• DC socket dia 5,5x2,5mm for print, plastic
• ps/2 socket for print
• Tact Switch 6x6mm, h=8,0mm
• lying assembly potentiometer 10k
• quartz 8,00MHz – HC49U
• IDC connector 10pin

Link to original thread (useful attachment) – Płytka Testowa ATMEGA 8 replika ZL2AVR