6. Electronics design¶

This week I worked on preparing PCB starting from circuit design to soldering and then tested it.

Individual assignment : - redraw an echo hello-world board, - add (at least) a button and LED (with current-limiting resistor) - check the design rules, make it, and test it - extra credit: simulate its operation

Group Assignment

I worked on wiring hello.USB-serial.FT230x,RX(Receiver) and TX(Transmitter) for checking with oscilloscope. Also played as a camera woman for recording the group work.

Redraw an echo hello-world board - using EAGLE¶

Selected ATtiny412 for UPDI
EAGLE setup Import necessary libraries to EAGLE from Kannai instruction site and copy from managed libraries of EAGLE. Change “View” to de-select bottom four panels to have better workspace for Schematic and Board respectively.
Placed parts tentatively and assign values to capacitor 1uF, and resistor 1k.

place tentatively

Decided which pin of ATtiny412 to connect LED and button. Considered spaces, decided to assign Pin 7 to LED and Pin 6 to button. Chosen pin available for PWM to blink LED a bit slowly.

Pins for Pin and button

Schematic In order to avoid complication of presentation put GND at ends.

Schematic

Design Rules : Set clearance as 16mil and size minimum width 16mil as well. Check errors by ERC.

Clearance

Then switch to Board view and drawing connections. This process was solving a sort of PUZZLE! Although it was looking OK, I got warning / errors in DRC.

GRC