Life on FR4

A few week ago I bought 5 piece  of ATMEGA88-PU on second-hand market  (www.vatera.hu).The cost was holly low about 0.3$/piece. I'm going to design and make my own arduino like development board for easy prototyping . I used Eagle Cad for designing the PCB and I used  toner transfer method for etching the PCB . Finally my first DIY PCB and my devboard for atmega88 is ready to go. This was the first prototype: Pin header for PORTB,PORTC and PORTD,ISP for Programing,GND and Vcc headers and Reset button 1 weeks later I realised some weaknesses: the power headers was broke I need to plug 2 usb device into my PC.A programer and an USB-Serial converter I can't see any heartbeat (onboard leds)  I pimped up my board with some goodness: Arduino bootloader for programing over UART (  thx  ) Extended Power headers  Onboard dual leds and voltage regulator The other stuff on the left side is USB to Serial converter from Sony...

This article based on this page. Lcd chip: based on PCF8558 I created my own  CPU FAN controller for my PC because my cooler was generate a lot of noisy.I used this LCD to print out the temperature data and PWM duty in %. The LCD use standard I2C interface for communicating with other stuffs.You can find the pinouts on the linked site. You can find more details on my GITHUB: https://github.com/zoon81/tinnyI2C Here is some pic: