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Gameboy Zero status icon overlay display

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# Gameboy Zero RetroPie status overlays
This repository contains a script to display lovely slightly-transparent overlays on top of your RetroPie games and emulationstation menus

## What can it do?
- display battery level (Requires ADS1x15)
- display WiFi state (connected/disconnected/disabled)
- display Bluetooth state (connected/disconnected/disabled)
- display under-voltage state
- display warning if frequency-capped
- display warning if throttling
- adjust icons' position to current display resolution
- gracefully shut down the Pi after 60s from when voltage goes below 3.2V
- show a big imminent shutdown warning when the counter starts ticking

## What do I need to get it running?
- See [installation instructions](#installation-instructions) below for setup steps
- [pngview](https://github.com/AndrewFromMelbourne/raspidmx/tree/master/pngview) from AndrewFromMelbourne
- [material-design-icons](https://github.com/google/material-design-icons/archive/master.zip) from Google
- Adafruit ADS1015 with Vbat on A0 (or alternative)
- a symbolic link to *overlay\_icons/ic\_battery\_alert\_red\_white\_36dp.png* under *material\_design\_icons\_master/device/drawable-mdpi/*
- an entry in crontab to start this on boot
- check and adjust paths in the script header if required
- some battery readings calibration - check logs
- some patience

## But what does it look like?
Like that:

![Bluetooth, wifi connected, battery discharging](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/connected.png)  
Bluetooth, wifi connected, battery discharging

![Bluetooth, wifi disconnected, battery discharging](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/disconnected.png)  
Bluetooth, wifi disconnected, battery discharging

![Bluetooth, wifi disabled, battery charging](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/disabled_charging.png)  
Bluetooth, wifi disabled, battery charging

![CPU throttled due to high temperature](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/throttle.png)  
CPU throttled due to high temperature

![Under-Voltage, Freq-capped due to high temperature, battery critical, shutdown imminent warning](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/freqcap_undervolt_criticalbat_shutdown.png)  
Under-Voltage, Freq-capped due to high temperature, battery critical, shutdown imminent warning - shutting down in 60s

![In-game](https://raw.githubusercontent.com/d-rez/gbz_overlay/master/_images/ingame.png)  
In-game

## Installation Instructions

SSH into your device or access the terminal using F4. We're assuming you already have Internet access configured

### 1. Install pngview by AndrewFromMelbourne
    mkdir ~/src && cd ~/src
    git clone --depth 1 https://github.com/AndrewFromMelbourne/raspidmx.git
    cd raspidmx/
    make -j4
    sudo cp pngview/pngview /usr/local/bin/

### 2. Download Material Design Icons by Google
    cd ~/src
    git clone --depth 1 https://github.com/google/material-design-icons.git material-design-icons-master

### 3. Download the script and install dependencies:
    mkdir ~/scripts && cd ~/scripts
    git clone --depth 1 https://github.com/d-rez/gbz_overlay.git
    ln -s ~/scripts/gbz_overlay/overlay_icons/ic_battery_alert_red_white_36dp.png ~/src/material-design-icons-master/device/drawable-mdpi/ic_battery_alert_red_white_36dp.png
    sudo apt-get update
    sudo apt-get install build-essential python3-dev python3-smbus python3-pip
    sudo pip3 install adafruit-ads1x15

#### Test the script:

python3 ~/scripts/gbz_overlay/overlay.py &

You should now see overlay icons

### 4. Set up script autostart
Note: Do not use rc.local, it's deprecated

sudo crontab -e

Then at the bottom of the file, add the line:

@reboot python3 /home/pi/scripts/gbz_overlay/overlay.py

You can use this one-liner instead if you prefer:

(crontab -l ; echo "@reboot python3 /home/pi/scripts/gbz_overlay/overlay.py") | crontab -

### 5. Reboot

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