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+DIU Version "Apple" Notes
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+===
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+
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+###### 2020-02-13
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+
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+This document is a place to discuss version "Apple" of the Driver Interface
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+Unit (DIU) hardware.
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+
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+This is a "living" document and is subject to updates and changes as work progresses.
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+
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+Overview
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+---
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+
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+Version "Apple" of the hardware DIU is meant to create a robust version of the DIU
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+using off the shelf components and custom hardware in the form of "hat" for the
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+Raspberry Pi board.
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+One item the "Apple" DIU is attempting to address is to eliminate all USB connections
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+as there is concern that the noisy environment will
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+interfere with the USB connections and cause intermittent issues.
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+
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+The current version of the DIU uses USB to:
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+
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+* Receive touch screen events in the form of a mouse input from the screen
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+* Communicate with the PIU over a USB-to-RS232 interface
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+* Interface with the FONA clone to receive GPS data
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+
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+Version "Apple" of the DIU aims to eliminate all these USB connections and replace
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+them by various forms of I2C, SPI or RS232 communication interfaces.
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+
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+Roadmap
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+---
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+
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+* Use a 7 inch capacitive touch display that supports mipi-dsi and some form of I2C or SPI for touchscreen events
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+* Use a DAC to get sound out of the I2C or PCM line of the Raspberry Pi
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+* Create a "hat" to:
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+ - house the MAX232 (or equivalent) for PIU communication
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+ - act as a consolidation of I2C, SPI or UART (or other peripheral management) coming in to funnel to the Raspberry Pi
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+ - house the 5W/15W+ amplifier
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+
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+TODO
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+---
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+
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+* Determine if the FONA clone can be powered via a 3.3v power line directly instead of through USB
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+* Determine whether GPS data can read from the FONA clone through another interface (SPI, I2C or UART)
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+* Create a rough diagram of the "hat" for the Raspberry Pi
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+* Research a monitor replacement
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+ - mipi-dsi input
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+ - I2C or SPI touch for mouse events
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+ - 3.3v input
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+* Find a suitable 3.3v buck converter
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+* Find a solution for sound
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+
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+References
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+---
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+
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+* [pHAT DAC](https://shop.pimoroni.com/products/phat-dac) ([and setup](https://learn.pimoroni.com/tutorial/phat/raspberry-pi-phat-dac-install))
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+* [7 inch display](https://shop.pimoroni.com/products/raspberry-pi-7-touchscreen-display-with-frame)
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+* [SIM5320A Expansion Board](https://www.amazon.com/DIYmall-Raspberry-Expansion-SIM5320A-American/dp/B06Y3N1BD6)
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+* [5W amplifier](amazon.com/NOYITO-PAM8406-Digital-Amplifier-Dual-Channel/dp/B07FZYK7HG/), [5W amplifier](amazon.com/Amplifier-DROK-PAM8406-Digital-Channel/dp/B077MKQJW2)
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+* [15W amplifier](amazon.com/HiLetgo-PAM8610-Digital-Amplifier-Channel/dp/B00WSN9S4Q)
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+* [MAX232 module](amazon.com/NOYITO-Module-Conversion-Arduino-communicates/dp/B07BJJ3TZR)
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+* [Variable Output Voltage Buck converter](amazon.com/DROK-90483-Voltage-Regulator-Converter/dp/B00C4QVTNU/)
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+* [KNACRO 5.3V-40V 3.3V 5A Buck Converter](amazon.com/Converter-5-3-40V-Power-Supply-Module/dp/B0792Q9ZHZ)
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+* [NOYITO 8V-22V to 3.3V 2A Buck Converter](amazon.com/NOYITO-Waterproof-Overcurrent-Short-Circuit-Undervoltage/dp/B07HCTNHL7/)
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+* [KNACRO 8V-22V to 3.3V 3A Buck Converter](amazon.com/KNACRO-Synchronous-Over-temperature-over-current-protection/dp/B07B8CRXK6/)
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