Plans for Raspberry Pi In Car Project

Hardware Used

Project Box
Raspberry Pi (v3)
PMB Power Board http://rcbeacon.com/blog/?page_id=3946
WIFI usb module (Not needed with Pi3)
1.2AH SLA Battery

Hardware Additional Planned

Camera: Pi Camera, Pi Camera HDMI Extender boards, HDMI Cable
GPS: GPS USB Module (puck)
Engine Logging: ODBII Bluetooth adaptor, Bluetooth adapter

Direct USB: USB Memory Stick
Direct USB: USB Hub
USB HUB: Keyboard (then numeric keyboard... or maybe bluetooth?)
USB HUB: Wifi Dongle (Not needed with Pi3)
USB HUB: GPS Device
USB HUB: Bluetooth Dongle (Not needed with Pi3)
USB HUB: Mobuis Dashcam
USB HUB: USB Hard Drive?
Pi Cam
NFC Shield

Menu Feedback and Selection

Karl's BASH menuing
https://github.com/KarlMW/bash-ivr

Raspberry Pi GPIO general info and scripts

GPIO Info http://raspberry.io/projects/view/reading-and-writing-from-gpio-ports-from-python/
File System GPIO activation https://sites.google.com/site/semilleroadt/raspberry-pi-tutorials/gpio
WiringPi c Lib http://wiringpi.com/
GPIO info from raspberry pi org https://www.raspberrypi.org/documentation/usage/gpio/
GPIO Benchmarks http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/
inputs and outputs, file method https://www.element14.com/community/docs/DOC-78315/l/raspberry-pi-gpio-explained

i/o for this project

Using this reference https://www.raspberrypi.org/documentation/usage/gpio-plus-and-raspi2/README.md
and https://sites.google.com/site/semilleroadt/raspberry-pi-tutorials/gpio

Used a 4 pin floppy disk connector on physical pins 7,9,11,13 which equates to IO4,GND,IO17,IO27.
The connector has fly leads of yellow (io4), black (gnd), black (IO17), red (IO27). The black was useful as a gnd for first testing IO but both black lead was then snipped.

GPIO Port 4 for HOLD (setting as 1 sets GPIO 4 to 3.3v)

sudo su echo 4 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio4/direction echo 1 > /sys/class/gpio/gpio4/value

notes, this is obviously volatile... on reboot GPIO4 is high appears high, but is actually floating. It appears to drop low when direction is set to 'out'

GPIO Port 27 for ACC IN (Set as 3.3V when power is pludded in to the ACC+12V)

sudo su echo 27 > /sys/class/gpio/export echo in > /sys/class/gpio/gpio27/direction cat /sys/class/gpio/gpio27/value

Audio Output

HF: Sound output of some sort to a small speaker (I2S?), also 3.5mm audio to car audio input. Hardware switch to turn small speaker off (for music play etc)