CarComputer - GPS & Weather Module for your vehicle

Flashing Raspberry Pi Hard Disk / Install required software (using Ubuntu Linux)

Download "RASPBIAN JESSIE LITE VERSION" from https://www.raspberrypi.org/downloads/raspbian/

Create your new hard disk for DashboardPI

Insert the microSD to your computer via USB adapter and create the disk image using the dd command:

Locate your inserted microSD card via the df -h command, unmount it and create the disk image with the disk copy dd command

$ df -h
/dev/sdb1       7.4G   32K  7.4G   1% /media/XXX/1234-5678*
$ umount /dev/sdb1

Caution: be sure the command is completely accurate, you can damage other disks with this command

• if = location of RASPBIAN JESSIE FULL VERSION image file
• of = location of your microSD card

$ sudo dd bs=4M if=/path/to/raspbian-jessie-lite.img of=/dev/sdX

(note: in this case, it's /dev/sdb, /dev/sdb1 was an existing factory partition on the microSD)

Setting up your Raspberry Pi

Insert your new microSD card to the Raspberry Pi and power it on with a monitor connected to the HDMI port.

First login: user: pi, password: raspberry.

Change your account password for security (from terminal):

sudo passwd pi

Enable Raspberry Pi Advanced Options (from terminal):

sudo raspi-config

Choose: 1 Expand File System

9 Advanced Options

A2 Hostname change it to "CarComputer"

A4 SSH Enable SSH Server

A7 I2C Enable i2c interface

Enable the English/US Keyboard

sudo nano /etc/default/keyboard

Change the following line:

XKBLAYOUT="us"

Reboot PI for Keyboard layout changes / file system resizing to take effect

$ sudo shutdown -r now

Auto-Connect to your Wi-Fi

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

Add the following lines to have your Raspberry Pi automatically connect to your home Wi-Fi: (if your wireless network is named "linksys" for example, in the following example)

	network={
	   ssid="linksys"
	   psk="WIRELESS PASSWORD HERE"
	}

Reboot Raspberry Pi to connect to WiFi network

sudo shutdown -r now

Now that your PI is finally on the local network, you can login remotely to it via SSH. But first you need to get the IP address it currently has.

ifconfig

Look for "inet addr: 192.168.XXX.XXX" in the following command's output for your PI's IP Address

Go to another machine and login to your Raspberry Pi via ssh

ssh pi@192.168.XXX.XXX

Install required packages

sudo apt-get update && sudo apt-get upgrade
sudo apt-get install build-essential git gpsd gpsd-clients i2c-tools libi2c-dev python3 python3-pip python-dev python-gps python-imaging python-pip python-smbus rpi.gpio vim python-psutil
sudo pip install RPi.GPIO

Update local timezone settings

sudo dpkg-reconfigure tzdata

select your timezone using the interface.

Setup the simple directory l command [optional]

vi ~/.bashrc

add the following line:

alias l='ls -lh'

Apply now:

source ~/.bashrc

Fix VIM default syntax highlighting [optional]

sudo vi  /etc/vim/vimrc

uncomment the following line:

syntax on

Supplies needed

2" 320x240 TFT LCD Digole Display

SSD1306 Display

DHT11 Humidistat

Raspberry Pi Zero

Momentary Push Button (x2)

LEDs (RED / Blue / Orange / Yellow)

Print the Enclosure

Using the provided STL files in the enclosure/ folder print the front and back panels as well as the enclosure.

Hot glue the push button switches, the LEDs and both displays as shown:

Building the CarComputer

This is the wiring for the unit

Connect the following Devices the pins on the Pi Zero

Digole:         3v / GND / SDA / SCL
SSD1306:        3v / GND / SDA / SCL
DHT11:          5v / GPIO 16 (36) / GND
Push Button 1:  GND / GPIO 18 (24)
Push Button 2:  GND / GPIO 11 (17)
Power LED:      330ohm resistor - 3v / GND

LEDs:

• LED Blue: 330ohm resistor - GPIO 27 (13) / GND (the Blue LED, for pin 13 will be for if the internet is connected or not)
• LED Orange: 330ohm resistor - GPIO 22 (15) / GND
• LED Yellow: 330ohm resistor - GPIO 23 (16) / GND (Yellow LED, pin 15 will be for if the GPS is currently tracking your location or not)

Connect the USB module to Raspberry Pi HW UART

Using HW UART for the GPS module requires the following to free the UART connection up on your Pi.

• "Cross"-Connect the TX and RX pins from the GPS module to the RPi TX (GPIO 14/8 pin) and RX (GPIO 15/10 pin) -- [TX goes to RX on the device and vice versa.]
• Connect RPi 5V to the VIN pin and the GPS module GND pin to an available RPi GND pin.

Final assembly

The following shows the internal devices wired before the enclosure is screwed shut on each corner front and back with small screws.

I've used very long speaker wire to allow for the humidistat to sit in the car away from the direct sun for an accurate reading.

Note: I've wrapped the wireless USB adapter in felt tape to have it avoid rattling while driving inside the enclosure.

Configure your Pi to use the GPS Module on UART

sudo vi /boot/cmdline.txt

Change:

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

to:

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

(e.g., remove console=ttyAMA0,115200 and if there, kgdboc=ttyAMA0,115200)

Note: you might see console=serial0,115200 or console=ttyS0,115200 and should remove those parts of the line if present.

Run the following commands:

sudo systemctl stop serial-getty@ttyAMA0.service
sudo systemctl disable serial-getty@ttyAMA0.service

GPS module install

For testing force your USB device to connect to gpsd

sudo gpsd /dev/ttyAMA0 -F /var/run/gpsd.sock
sudo systemctl stop gpsd.socket
sudo killall gpsd
sudo dpkg-reconfigure gpsd
sudo vi /etc/default/gpsd

Default settings for gpsd:

START_DAEMON="true"
GPSD_OPTIONS="-n"
DEVICES="/dev/ttyAMA0"
USBAUTO="false"
GPSD_SOCKET="/var/run/gpsd.sock"

Make sure the command is working

cgps -s

DHT11 Install

cd ~
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
cd Adafruit_Python_DHT/
sudo python setup.py install
sudo python ez_setup.py
cd examples/
vi simpletest.py

Change the following line:

sensor = Adafruit_DHT.DHT11

Comment the line out

pin = 'P8_11'

Uncomment the line and change the pin number to 16

pin = 16

Run the test:

python simpletest.py

You should see a metric reading of Temp and Humidity displayed on the command line.

SSD1306 Display Driver

Download and install drivers for ssd1306 display:

sudo apt-get install i2c-tools python-smbus python-pip ifstat git python-imaging
git clone https://github.com/rm-hull/ssd1306.git
cd ssd1306
sudo python setup.py install
sudo pip install pillow

Setup and Run the scripts

cd ~
git clone https://github.com/khinds10/CarComputer.git

Install driving monitoring tools & DB Logging

sudo apt-get install ifstat memcached python-memcache postgresql postgresql-contrib python-psycopg2
sudo vi /etc/postgresql/9.4/main/pg_hba.conf

Add the following line to the end of the file:

local all pi password

sudo -i -u postgres
psql

create role pi password 'password here';
alter role pi login;
alter role pi superuser;
\du

(you should see your PI user with the permissions granted)

create database driving_statistics;
\q
exit
psql -d driving_statistics

Run the following queries:

CREATE TABLE driving_stats (
 id serial,
 time timestamp without time zone NOT NULL,
 new_trip_start timestamp without time zone NULL,
 gps_latitude double precision,
 gps_longitude double precision,
 gps_altitude real,
 gps_speed real,
 gps_climb real,
 gps_track real,
 locale_address text,
 locale_area text,
 locale_city text,
 locale_county text,
 locale_country text,
 locale_zipcode text,
 inside_temp real,
 inside_hmidty real,
 weather_time timestamp,
 weather_summary text,
 weather_icon text,
 weather_apparentTemperature real,
 weather_humidity real,
 weather_precipIntensity real,
 weather_precipProbability real,
 weather_windSpeed real
);
CREATE UNIQUE INDEX time_idx ON driving_stats (time);

Hack required to get GPSD working with UART connection on reboot

sudo su
crontab -e

# m h  dom mon dow   command
@reboot /bin/sleep 5; killall gpsd
@reboot /bin/sleep 10; /usr/sbin/gpsd /dev/ttyAMA0 -F /var/run/gpsd.sock

Create the logs folder for the data to be saved

mkdir /home/pi/CarComputer/computer/logs

Setup the scripts to run at boot

crontab -e

Add the following lines:

@reboot /bin/sleep 15; nohup python /home/pi/CarComputer/computer/GPS.py > /home/pi/CarComputer/computer/GPS.log 2>&1
@reboot /bin/sleep 15; nohup python /home/pi/CarComputer/computer/Indicators.py > /home/pi/CarComputer/computer/Indicators.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Button.py > /home/pi/CarComputer/computer/Button.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Compass.py > /home/pi/CarComputer/computer/Compass.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Locale.py > /home/pi/CarComputer/computer/Locale.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Temp.py > /home/pi/CarComputer/computer/Temp.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Weather.py > /home/pi/CarComputer/computer/Weather.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Stats.py > /home/pi/CarComputer/computer/Stats.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Logger.py > /home/pi/CarComputer/computer/Logger.log 2>&1
@reboot /bin/sleep 20; nohup python /home/pi/CarComputer/computer/Digole.py > /home/pi/CarComputer/computer/Digole.log 2>&1

Finished and powered on!

Mounting inside your vehicle

• Mount on Dash

• Mount Humidistat away from direct Sun

• Reboot your Raspberry Pi and you should be ready for driving!