VGA4EVA is a hacky DIY VGA signal generator based on Arduino, and designed as the first CHA/V expansion module. Prior to VGA4EVA, it was necessary to source a VGA test signal generator and wire it to the CHA/V.
VGA4EVA is named for the useless Ali Express customer service bot that you get to deal with when one of the many unreliable sellers fails to ship your VGA test signal generator. VGA4EVA replaces the test signal generators and adds some features:
- Patchable triple filter/attenuator
- Background patterns and sync are hackable
- RGB background pattern channels are independently patchable
- Background patterns can be used as weird oscillator sync sources
- Dedicated 3.5mm output jacks for horizontal and vertical sync pulses
- No longer requires any wiring — easy CHA/V connect/disconnect via pin headers
VGA4EVA is compatible with CHA/V 3.0, and also CHA/V 2.0. Previously built versions of the CHA/V 2.0 require a free adapter PCB.
Although VGA4EVA was designed to be the brain of a CHA/V, it can also be built as a standalone device with limited functionality. As a standalone device, VGA4EVA can act as a rudimentary video encoder and sync source for audio oscillators.
Please note that for the build-phase only, VGA4EVA requires a computer that meets the meager Arduino system requirements. You will need to do some light copy/paste style Arduino programming following step-by-step instructions (covered in the programming guide below). Once VGA4EVA is programmed to your liking, there is no longer any legitimate use for the computer, and you may feel free to drop-kick it through a window of the corporate entity of your choosing.
BUILD GUIDE (Including quick-order BOM)
Inexpensive PCBs for CHA/V 3.0 and VGA4EVA are available basically as a public service by Thonk (UK), Modular Addict (USA), and Raw Voltage (EU) (06/07/21)