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ErleBrain2

ErleBrain2

ErleBrain 2.0

Raspberry Pi + PXF2 in a 3D printed case.

http://docs.erlerobotics.com/brains/erle-brain-2

Basic Configuration

# Stop X.org using raspi-config
sudo raspi-config

vi /boot/config.txt
vi /boot/cmdline.txt
vi ~/apm.sh

Basic Commands

# To start, stop, restart ArduPilot
# Ultimately, ~/apm.sh gets called
sudo systemctl start apm.service
sudo systemctl stop apm.service
sudo systemctl restart apm.service

ArduCopter Settings

launch script

vi ~/apm.sh

# -B option sets the GPS port
/home/erle/ArduCopter.elf -A udp:10.0.0.2:6000 -B /dev/ttyAMA0 -l home/erle/APM/logs -t /home/erle/APM/terrain/

Compass

Apparently, you shouldn't use an external compass on ErleBrain2?

NOTE: When there's an external GPS/Compass module attached, your "compass 1" is the external, and ErleBrain's internal compass is "compass 2"

COMPASS_PRIMARY = 1 # set it to the internal compass
COMPASS_USE = 0 # don't use the external compass
COMPASS_USE2 = 1 # use internal compass

GPS

Apparently, you need to setup your GPS certain way in order for it to work with ErleBrains?

NOTE: No need to do this (upload the Erle GPS Config file to GPS module) with auto config in AC3.4

If you don't see the following messages on MAVLink messages window in your GCS after booting ErleBrain, yet you can see NMEA or ublox sentences on /dev/ttyAMA0 and blue LED on the GPS module flashes every second (meaning it's catching GPS satellites), then GPS related parameters in ArduPilot are probably not set correctly.

GPS 0: detected as u-blox at 115200 baud
u-blox 0 HW: 00070000 SW: 1.00 (59842)

Make sure you reboot EB2 after accelerometer and compass calibration.

Check the following parameters:

SERIAL3_PROTOCOL = 5 # must be set to GPS eventhough on Linux, you specify GPS device on the command line
SERIAL3_BAUD = 115 # must be set to 115200 baud

GPS_TYPE = 2 # 1 (auto detect) should work. If having problems, set this to U-Blox, or 5 for NMEA
GPS_TYPE2 = 2 # 0 (disabled)
GPS_AUTO_CONFIG = 1 # This should take care of GPS config automatically
GPS_SAVE_CFG = 1 # Save GPS configuration in flash memory inside the GPS module
GPS_GNSS_MODE = 51 # for Japan

u-blox u-center

To use u-blox u-center app without directly connecting the GPS to PC via USB

Install u-center

https://www.u-blox.com/en/product/u-center-windows

Download and install socat

wget http://www.dest-unreach.org/socat/download/socat-1.7.0.1.tar.gz
tar -xvf socat-1.7.0.1.tar.gz
cd socat-1.7.0.1
sudo ./configure
sudo make
sudo make install

Access GPS from u-center app via socat

# launch socat on ErleBrain to access the u-blox GPS serial interface from u-center app on Windows.
sudo systemctl stop apm.service
sudo socat tcp-l:2000,reuseaddr,fork file:/dev/ttyAMA0,nonblock,waitlock=/var/run/ttyAMA0.lock,b9600,iexten=0,raw

Once socat is running, connect to it from u-center at 127.0.0.1:2000 (substitute with your local IP).

Video Streaming - gstreamer

http://docs.erlerobotics.com/erle_robots/related/ground_control_station/qgroundcontrol/camera_streaming

Install

# Enable camera
sudo raspi-config

# Disable erle's camera service
sudo systemctl stop camera.service

# install gstreamer
sudo apt-get update
sudo apt-get install gstreamer1.0*

Fix permission issues

# http://raspberrypi.stackexchange.com/questions/19436/how-can-i-permanently-fix-dev-vchiq-permission-errors
sudo usermod -a -G video $(whoami)
sudo chmod u+s /dev/vchiq

Test

# Test to see if stream works by lanuching raspivid manually and connecting to it at udp://@:5600 using VLC from your PC.
sudo raspivid -n -fl -w 1280 -h 720 -b 10000000 -fps 24 -t 0 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=10 pt=96 ! udpsink host=10.10.10.2 port=5600

Startup Script

vi ./videostream.sh

#!/bin/bash

sudo raspivid -n -fl -w 1280 -h 720 -b 10000000 -fps 24 -t 0 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=10 pt=96 ! udpsink host=10.10.10.2 port=5600

Change Permission

chmod a+x ./videostream.sh

Service Script

sudo vi /lib/systemd/system/videostream.service

[Unit]
Description=Video Streaming service
After=apm.service

[Service]
#Type=oneshot
ExecStart=/home/erle/videostream.sh

[Install]
WantedBy=multi-user.target

Register Service

sudo systemctl daemon-reload
sudo systemctl enable videostream.service
sudo systemctl start videostream.service

# To check the status
sudo systemctl status videostream.service

Video Streaming - mjpg-streamer

To be filled...

ROS

If you want to disable ROS to save CPU power

# config files are in /lib/systemd/system/
sudo systemctl disable ros.service
sudo systemctl stop ros.service
sudo systemctl disable mavros.service
sudo systemctl stop mavros.service
sudo systemctl disable mavros-serial.service
sudo systemctl stop mavros-serial.service
sudo systemctl disable mavros-serial2.service
sudo systemctl stop mavros-serial2.service
sudo systemctl disable mavros-wifi.service
sudo systemctl stop mavros-wifi.service
sudo systemctl disable camera.service
sudo systemctl stop camera.service
sudo systemctl disable spider.service
sudo systemctl stop spider.service
sudo systemctl disable streamingBrower.service
sudo systemctl stop streamingBrower.service
sudo systemctl disable vehicle-init.service
sudo systemctl stop vehicle-init.service


# check to see the running status of services
sudo systemctl

References: