The Assignment:

1. Redraw the echo hello-world board
2. Add (at least) a button and LED (with current-limiting resistor)
3. Check the design rules, make it, and test it

I started the design using the echo hello-world board here as a reference. I used Eagle as the design software as I had used it previously and was comfortable using it.

The final schematic...

I then designed the board...

Once that was done I extracted the necessary PNG files for etching. I had to mirror the image as it was the top layer.

After etching and mounting the components I had...

I then downloaded the makefile here. I then renamed it makefile to make it easier to use.

I the created a simple AVR C blink code using nano editing software, that uses the button as an input to light the led. The code can be downloaded here.

I then had to edit the makefile so as to allow me to build the blink code into a hex file which can then be loaded onto the board. To do this, I edited the PROJECT from hello.ftdi.44.echo to blink.

I saved the makefile and exited the editor.

Next up, generating the necessary hex file. To do this I ran...

make

To upload the code,...

avrdude -c usbtiny -p attiny44 -P usb -U flash:w:blink.c.hex:i

Testing the circuit...

Assignment wise:

1. Redraw the echo hello-world board
2. Add (at least) a button and LED (with current-limiting resistor)
3. Check the design rules, make it, and test it

Files

Designs

1. Schematic
2. VBoard

Code

1. Blink LED Code
2. Original Makefile
3. Makefile

Packaged Code files firmware.zip