Pada praktikum elektronika dasar tentang Desain dan Analisis PCB Cetak dengan menggunakan software Ares 7 Profesional sebagai acuan dasar pem-buatan rangkaian nyata bertujan untuk mengetahui peralatan apa yang di-gunakan dalam sistem minimum, Memahami prinsip kerja alur Rangkaian, Mampu membuat desain PCB secara personal. Teknik percobaannya dengan. Skema rangkaian minimum sistem ATMega 8 adalah seperti gambar diatas, namun dalam desain layout, saya tambahkan beberapa komponen seperti: LCD16x2 (1), pushbutton (5), LED 5mm (5), LED RGB (1), dan buzzer (1). Langsung saja deh aku tunjukin gambar-gambar dari desain dan pengerjaan.
Additional components compared to the prototype board:. LED x 1 and 1k current limiting resistor x 1 between chip's AVCC/VCC and GND as power indicator. Schottky diode between CP2102 module 5V input pin and onboard 5V pin, to prevent reverse-current going to computer's USB port when CP2102 module and an external 5V DC power source are connected at the same time.Specifications/features of the board layout:. Total component count on board is 12. Board dimension is 38.1mm x 38.1mm.
Connector pins to match CP2102 module. All digital pins and analog pins arranged in sequential order.
Mounting holes. 4-layer PCB (failed attempt to route the traces in 2-layer). PCB's were made by a manufacture found on China's; the cost for 4-layer PCB was 300RMB (45USD) excluding shipping for 10 pieces of 10cm x 10cm board (total of 48 'Naked Mega' produced, with panelizing and extras boards giving by the manufacture), production time was 6 days.The leaded HASL process was selected for surface finish, this finish is not very flat, thus silkscreen (text and logo.etc.) wasn't pretty; next revision will probably try Electroless Nickel Immersion Gold (ENIG) as the surface finish, cost would be 400RMB (60USD) for the same order.