EV3-projects

My Lego EV3 projects using Lejos

• EV3 clock - youtube preview

EV3 Setup

1. Downloaded JDK ejdk-8-fcs-b132-linux-arm-sflt-03_mar_2014.tar.gz
2. Create jre using : bin\jrecreate.bat --profile compact2 --dest ejre1.7.0_60 --vm client
3. Use 7Zip to create ejre-7u60-fcs-b19-linux-arm-sflt-headless-07_may_2014.tar archive with above folder inside
4. Use 7Zip to create ejre-7u60-fcs-b19-linux-arm-sflt-headless-07_may_2014.gz with above file
5. Copy it to SD card
6. (Optional) Copy wpa_supplicant.conf (see below wifi setup)

Based on: https://sourceforge.net/p/lejos/wiki/Installing%20leJOS/

http://java.com/legomindstorms redirects to http://www.oracle.com/technetwork/java/embedded/downloads/javase/javaseemeddedev3-1982511.html , but I used http://www.oracle.com/technetwork/java/embedded/embedded-se/downloads/legomindstormev3-2200042.html to get the jrecreate parameters.

WARN: compact3 (javax.naming) seems to be needed by logback: http://www.oracle.com/technetwork/java/embedded/resources/tech/compact-profiles-overview-2157132.html

Connection configuration

Check PAN menu for ip address.

USB

1. Connect usb cable
2. In PAN menu check USB client - set IP address from the same pool as IP on PC (USB Ethernet/RNDIS Gadget). For example 169.254.90.1 on EV3 and 169.254.90.196 on PC.
3. Exit menu - the ip will be set when PAN restarts

Wifi

Entering password from EV3 menu is not the best option, so better hardcode some network settings.

1. Use ssh to connect to EV3 - user root, password blank.
2. Use wpa_passphrase to generate a passkey
3. Create a /home/root/lejos/bin/utils/wpa_supplicant.conf, eg.:

ctrl_interface=/var/run/wpa_supplicant

network={
        ssid="mySSID"
		key_mgmt=WPA-PSK
        psk=myEncryptedPassword
}

First line is taken from /home/root/lejos/bin/utils/base_wpa_supplicant.conf

Based on: https://sourceforge.net/p/lejos/wiki/Configuring%20Wifi/

Jar upload and run

1. Check IP in pom.xml
2. mvn install - this will build, test and upload project to EV3
3. Run it from EV3 menu