Comparing RaspberryPI, BananaPi and A10-OLinuXino-LIME Power consumption and SATA performance

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Hardware-Libre made interesting blog post which comparison between PaspberryPi, BananaPi and A10-OLinuXino-LIME.

Connecting GPS to OLinuXino and RaspberryPI

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MOD-GPS is very sensitive, low power GPS SirfStarIII module with UEXT connector and can be connected directly to any of our boards. It sends NMEA messages with 19200 bps.

To connect it to OLinuXino is very easy just plug it to UEXT connector, to connect to RaspberryPI you will need RPI-UEXT adapter.

The Project files are at GitHub: https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A13/MOD-GPS

MOD-GPS is with UART connection, as same UART is used in OLinuXino and RaspberryPI for console to work with MOD-GPS you should first disable the console and connect to OLinuXino or RaspberryPI via ssh.

In OLinuXino you should do this:

#vi /etc/inittab
Comment the line: “T0:23:respawn:/sbin/getty -L -a root ttyS0 115200 vt102”
Save the file and reboot.
!!!Before rebooting you should have working SSH

in RaspberryPi you should do the same but there the console UART name is ttyAMA0

After the reboot login with ssh and connect MOD-GPS to OLinuXino or RaspberryPI, then compile and run it:

#make clean
#make
#./MOD-GPS --tty:"/dev/ttyXXX"

for OLinuXino ttyXXX is ttyS0 for RaspberryPi ttyXXX is ttyAMA0

if everything is OK you should see this picture:

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congratulations now you have GPS to your linux board 🙂

Add Real Time Clock to OLinuXino and RaspberryPi with MOD-RTC

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MOD-RTC is real time clock with battery backup. OLinuXino and RaspberryPi have no RTC so when the boards are powered off they lost their date/time setting.

This could be easily changed with MOD-RTC. OLinuXino have UEXT connector where MOD-RTC could be connected directly, RaspberryPI should have also RPI-UEXT adapter to may use MOD-RTC.

The code for MOD-RTC is on GitHub https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A13/MOD-RTC

It’s written in Python so you have to install it before use. The code allow few things to be done. You can copy your board system clock to MOD-RTC with

#sudo python MOD-RTC.py --verbose --i2c=0 -w

you can read MOD-RTC date/time with

#sudo python MOD-RTC.py --verbose --i2c=0 -r

you can sync system clock to MOD-RTC with:

#sudo python MOD-RTC.py --verbose --i2c=0 -s

the only difference when run on A13, imx233 or RaspberryPi is the I2C address which called as program parameter:

Where I2C-Bus is:
	0 for IMX233
	2 for A13
	0,1 for RPi, depending of the revision

Raspberry Pi project – interfacing Wii-Nunchuk with RPi

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Wii Nunchuck  is Wii remote controller with 3-axis accelerometer, joystick and two button combo. Those who have watched old Bruce Lee movies know how dangerous such Nunchaku could be in some hands 😀 http://www.youtube.com/watch?v=bRyDcB7qQFo

Olimex offers Wii-Nunchuck with UEXT adapter board for EUR 6.95 https://www.olimex.com/Products/Modules/Sensors/MOD-WII/MOD-Wii-UEXT-NUNCHUCK/

and now with RPI-UEXT https://www.olimex.com/Products/Modules/Adapters/RPi-UEXT/ you can connect Wii remote to your Raspberry pi

The Python code is on GitHub https://github.com/OLIMEX/raspberrypi when you start it you will see on the console:

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the joystick coordinates, accelerometer XYZ values and two button status

Friday Free Board Quiz issue #25 is RPI-UEXT + MOD-IO2

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RPI-UEXT allow Raspberry Pi to have access to different modules see original blog post we made about it: https://olimex.wordpress.com/2012/11/21/raspberry-pi-gpio-to-breadboard-and-uext-adapter/

MOD-IO2 allow RaspberryPi to control 2 relays and to read/write 7 additional GPIOs, including Analog inputs. On top of this MOD-IO2 is stackable and addressable so you can stack and connect to Raspberry Pi as many relays as you need for your project.

You have chance to win RPI-UEXT + CABLE26-pin + MOD-IO2 today if you answer correctly our quiz question!

Today at 17.00 o’clock our local Bulgarian time (GMT+2) we will post on Twitter our questions.

You have one hour to reply to our tweet with the correct answer.

At 18.00 o’clock we will count the correct answers and ask random.org to generate random number in range then announce the winner and ship the board by airmail in Monday.

Good Luck!

A13-OLinuXino preliminary schematic is complete

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A13-OLinuXino preliminary schematic is complete, here is what we got:

– A13 Cortex A8 processor running at 1GHz
– MALI 400 GPU, 1080p codec
– 512 MB of RAM
– 3+1 HS USB hosts (one reserved for WIFI module on board)
– USB OTG (can power the board)
– Audio input
– Headphone output
– VGA connector
– (optional 4GB NAND flash on board)
– micro SDcard
– 6-16VDC power supply input
– (optional LiPo battery power supply block, allow board to run hours on LiPo 3.7V battery)
– (optional RTL8188CU WIFI module on board)
– 5 buttons
– Real Time Clock module with PCF8563
– LCD expansion port, if no connected to LCD provide 30 GPIOs
– UEXT connector with SPI, I2C, UART for attaching additional UEXT modules
– GPIO connector with 40 GPIOs
– console UART header for USB-SERIAL-CABLE console debug

The readable PDF version of the schematic is push on GitHub. CAD files will not be uploaded until we complete and debug the design.

We try to put this in 120×90 mm board size and this picture show preliminary attempt to put the connectors on correct locations.

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when we released iMX233 everyone was comparing this ARM9 board with Raspberry Pi or Beagle Bone, commenting how small memory it have and runs on only 454Mhz.

Now if we have to do same comparison and if we trust what is written here: http://lists.phcomp.co.uk/pipermail/arm-netbook/2012-June/004194.html i.e. that Cortex-A8 + NEON coprocessor at 500Mhz runs applications x4 times faster than ARM1176 at 720Mhz we have to say thay A13-OLinuXino will have x2 times more memory than RaspberryPi and will run code x8 times faster.
If we compare A13-OLinuXino with BeagleBone it will have x4 times more memory and will run code about x1.5 times faster.

EDIT: 13.06.2012 PCB layout changed to 130×90 mm to fit all connectors and buttons: