Here is the board view

And here is the PNG file used

Using the FabModule to generate the Gcode

And a Roland monoFab SRM-20
, to mill the PCB

Now it is time to solder the components

Here is my Soldering Lab at home

And the PCB finished

First a tried to burn the boatloader to my Satshakit
using USBasp key (a key I bought)

But I got an error, no chance to make it works

So I decided to use an Arduino Uno as ISP
loading ArduinoISP to Arduino Uno

Configuring the Programmer correctly to "Arduino as ISP"

Here is the pinout Schema to use Arduino Uno as a ISP Programmer

This time Burn Bootloader was a success

Here is my program
The aim is to get as an output the distance mesured by the sensor

Serial Plotter view

Serial Monitor view

Wire connections
Arduino Uno is only use as a Programmer

Here is the Neil's original board

Using the FabModule to generate the Gcode.
See the related .png and .rml files in the ouputs at the top of the page.

Here is my board

Programming the board with my FabISP

Learning how to use Software Serial, in order to get an output in the Arduino IDE Serial Monitor via the FTDI cable
See the program ATtiny45_speaking_to_serial_via_software_Serial in the ouputs at the top of the page

Learning about pull-down resistor ...
(resistor external to the microcontroler, to be put on PCB)

... and about pull-up resistors
(resistor internal to the microcontroler,
that we can enable on the button Input PIN by programming)

Trying to push state of the button pin to Serial, using pull-up resistor
Using commands "pinMode(pinButton, INPUT_PULLUP);"
and command "val=digitalRead(pinButton);"
But it is not working, even using old style (2 lines style) for pinMode or using analogRead or disabling pull_up resistor
Output is not relevant, I got it changing, but not going to 0 when pressing the button, looks like I'm not reading the good info from attiny, and I'm not sure pull-up is correctly enabled.
See the program Switch_as_input_to_serial_NOT_WORKING in the ouputs at the top of the page.

Push state of the button pin to Serial with success
Now using the "avr/io.h" library, cbi and sbi definitions,
using cbi and sbi to configure input pin with pull-up resistor (DDRB and PORTB register bits of PB4),
and reading the PINB register bit of PB4 to get the relevant info.
See the program Switch_as_input_to_serial_WORKING in the ouputs at the top of the page.

Learning how to configure Pin in the Attiny datasheet page 54,
this page explains that each port pin consists of three register bits: DDxn, PORTxn, and PINxn

And in the Attiny datasheet page 64,
is described the register bits PORTB, DDRB (that I used in my program to configure pin) and PINB (that I used in my program to read pin)