What is the KevBoy?
In its current state, the KevBoy is a breadboard prototype of a handheld RPI based retro gaming system using the retropie image. ADD IMAGE
The KevBoy is a
What is the purpose of making this public git repository?
What has already been implemented within the KevBoy?
As previously mentioned, the KevBoy currently has a breadboard prototype shown in the image below. ADD IMAGE
The breadboard design has 3 visible layers to it. In the bottom layer, we have the controls. These controls match what you would expect from a standard controller:
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There is also an MCP3008 ADC between the analog sticks that convert the analog voltage outputted from the x and y axis potentiometers into a digital code readable by the PI.
The layer above the controls lives the necessary electrical components needed to connect the controls to the GPIO pins.
In this layer we have LEDs acting only as Diodes. These diodes are necessary due to the button matrix solution used to reduce the number of GPIO pins used from 16 to 8.
Without the diodes, multiple button presses can lead to an unpressed button being incorrectly registered (see below)
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In its current prototype state, the PI currently has 11 connected buttons (including L3 on the DS3 analog), while the final will support at least 16 when adding R3 and the Triggers. With several other devices needing to be connected to the GPIO pins, such as ADC, PWM speakers, UPS UART connections, ect, there are simply not enough pins. The HW/SW solution was to build a button matrix, in which 16 buttons could be supported with 8 pins.
What still needs to be implemented?
Setup:
Sound: https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/raspberry-pi-usage
Background music: https://github.com/Naprosnia/RetroPie_BGM_Player