Exercise 6

04.03.2015

Electronics Design

Assignment

• Redraw the echo hello-world board,
• add (at least) a button and LED (with current-limiting resistor)
• check the design rules, and make it

Hello World.... no... Hello Bulb

During the redesign of the Hello world board I think that is a very simple board without a pracatical use, so I decided to make one similar but a little more useful.

I called it HELLO BULB

This is the BOM:

• 6-pin programming header to program the board
• Attiny44A
• FTDI header for power supply and computer connection
• 20 MHz Resonator external crystal clock generator, Attiny44A can work also @20Mhz
• Capacitor for a better quality input current
• 4 680 ohm Resistors
• 330 ohm Resistors
• 4 red LED
• 1 blue LED
• 10k resistor

The resistor to reduce the LED voltage are calculated with this Led Calculator

 

Design with Eagle

Engraved with laser

After laser engraving I had to clean the board with water and a sponge to remove the burned parts and clean the circuit.
Then I soldered all the components starting form the Attiny44, the resonator, resistors and LEDs and the header to connect ISP and FTDI cable

this is the result of the finished board



Here you can download the EAGLE FILE