Plans for Raspberry Pi In Car Project

Original concept notes: MiniCarComputer

Progress/Timeline

- Found box from neighbour's electrical junk
- Found spare USB Hub and pulled cover off
- Got to play with my dremel...
- Boards etc Mounted in box https://goo.gl/photos/557hZXdP5od1e4TA7
- decided to use my RPi3 instead of pi1.
- got a spare USB memory stick to use
- booted up raspbian console via HDMI and set up networking & OS updates
- i/o Connected and tested https://goo.gl/photos/EBsePoqLMcXUVTai9
- Ordered RTC and Amp modules
- Tested Pi power board functionality...
- Decided on circuitry for triggers and overrides https://goo.gl/photos/yKk6YVA8tEDinBCm8
- Obtained additional components, decided on switch types
- Got i/o pins working for hold and ACC active
- Moved GPIO pins as interfered with placing the RTC
- Got the RTC working
- Scripted the first part of bootup to set the GPIO

Network Notes

On home network, Static DHCP assigned, hostname koala.foxlan 192.168.1.105

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

Attached Devices

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 Setup

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.
Changed to individual pins - GPIO 27 and 17

GPIO Port 17 for HOLD (setting as 1 sets GPIO 17 to 3.3v)

sudo su echo 17 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio17/direction echo 1 > /sys/class/gpio/gpio17/value

notes, this is obviously volatile... on reboot GPIO17 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 plugged 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

Time and Date

Decided to get a RTC as may not always have GPS and/or network. Wrong log times are annoying.
https://nicegear.co.nz/raspberry-pi/high-precision-real-time-clock-for-raspberry-pi/
Can get similar for <$2 from china but this will do
Need to check pinouts - doesn't piggyback so need to make sure we don't need the same i/o pins.
Info on how to use https://nicegear.co.nz/blog/using-a-ds3231-i2c-real-time-clock-rtc-with-a-raspberry-pi-updated-for-jessie/

GPS Setup

http://raspberrypi.stackexchange.com/questions/547/how-do-i-attach-a-gps-receiver

Just needed to install gpsd and a bunch of stuff that comes with it

sudo apt-get install gpsd gpsd-clients python-gps

test status with cgps -s

http://raspberrypi.stackexchange.com/questions/28483/cgps-gps-timeout

Edit /etc/default/gpsd

# Default settings for the gpsd init script and the hotplug wrapper. # Start the gpsd daemon automatically at boot time START_DAEMON="true" # Use USB hotplugging to add new USB devices automatically to the daemon USBAUTO="true" # Devices gpsd should collect to at boot time. # They need to be read/writeable, either by user gpsd or the group dialout. DEVICES="/dev/ttyUSB0" # Other options you want to pass to gpsd GPSD_OPTIONS="-F /var/run/gpsd.socket"

sudo killall gpsd sudo systemctl enable gpsd.socket sudo systemctl start gpsd.socket sudo cgps -s

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)
Ordered one of these... can get cheaper/similar but this should do
https://nicegear.co.nz/electronics-gear/adafruit-i2s-3w-class-d-amplifier-breakout-max98357a/
...need i2S pinouts for Pi3
Notes on this unit https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/raspberry-pi-usage

Pi Cam getting started https://www.raspberrypi.org/learning/getting-started-with-picamera/
Pi Cam basics https://thepihut.com/blogs/raspberry-pi-tutorials/16021420-how-to-install-use-the-raspberry-pi-camera
More Pi Camera & Python info http://www.makeuseof.com/tag/raspberry-pi-camera-module/

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CategoryHowTos
CategoryRaspberryPi
CategoryVehicles
CategoryLinux

zorruno wikki RaspberryPiInCarProject

Revision [2630]

Plans for Raspberry Pi In Car Project

Progress/Timeline

Network Notes

Hardware Used

Hardware Additional Planned

Attached Devices

Menu Feedback and Selection

Raspberry Pi GPIO general info and scripts

i/o Setup

Time and Date

GPS Setup

Audio Output

ODB2 Engine Logging

GPS Logging

Pi Camera Snapshots and Video

Dashcam Video Store

Music Server

Navigation