# Motorized Fader

## Description

Program for the ATtiny13A that controls a motorized fader by moving into a 
saved position read out of EEPROM memory.

## Requirements

**Hadware:**

- ATtiny13A/ATtiny45/ATtiny85.
- usbasp programmer.
- UNIX computer(to use the scripts for automation).

**Software:**

- avr-gcc
- avrdude(<=7.0)
- CMAKE(<= 3.20)

## Instructions

### Setting Fader Position

To set the fader position preform a long press of the button.

The position will now be saved into the EEPROM memory.

### Move to Position

To automatically move the fader into the saved location preform a quick
press of the button.

The speed can be adjusted by changing the input value of the speed pot. The 
speed adjustment affects the on/off ratio of the motor and has a programmed
minimum speed value in the function to prevent endless looping.


## Building Project(Windows)

### Flashing the Project

**On Windows(usbtinyisp)**

1. Install the usbtiny driver:
    1. plug in usbtiny device 
    2. Install the drivers from: [adafruit](https://learn.adafruit.com/usbtinyisp/drivers) 
2. open Powershell
3. navigate to the repo directory *cd Downloads\gf_002*
4. enter the command below.

```ps1
./avrdude.exe -p t13 -c usbtiny -B 125kHz -U flash:w:.\build\src\main.hex -U lfuse:w:0x6A:m -U hfuse:w:0xFF:m -U lock:w:0xFF:m
```


**On Windows(usbASP)**

1. Install the usbasp driver:
    1. plug in usbasp device 
    2. run the 'zadig-2.8.exe' program
    3. select the libusb 32 on the right by clicking the down arrow to select.
2. open Powershell
3. navigate to the repo directory *cd Downloads\gf_002*
4. enter the command below.

```ps1
./avrdude.exe -p t13 -c usbasp -B 125kHz -U flash:w:.\build\src\main.hex -U lfuse:w:0x6A:m -U hfuse:w:0xFF:m -U lock:w:0xFF:m
```

## Building Project(UNIX)

### Building Hex Files

Builds the binary hex files. They are located in the `build/src/` directory
found in the project root.

```sh
cd ./<PROJECTNAME>
echo "2" | ./otto.sh

```

### Automated Flashing Hex Files

Builds then flashes the binary hex files onto the micro-controller

```sh
cd ./<PROJECTNAME>
echo "4" | ./otto.sh

```

### Running Tests

The code below will run the cpputest tests in verbose and color mode.

```sh
cd ./<PROJECTNAME>
echo "1" | ./otto.sh

```