Sunday, March 27, 2016

SBC IoT

Single Board Computer for Internet of Things now are getting more popular since Raspberry Pi.  Now we can see even 64-bit SBC with less than $40 price tag!

Following is the list of SBCs I can think of:


BrandModelCPUPriceWebsite
Raspberry-PiRPI1 Model A+BCM2835$25
Raspberry-PiRPI1 B+$35
Raspberry-PiRPI2 Model BBCM2836$35
Raspberry-PiRPI 3 Model B$35
Raspberry-PiZero$5
CHIPAllWinner R8 (ARM)$9
Pine64Cortex-A53 AllWinner A64$15 - $29

Sunday, February 21, 2016

Arduino 828p Pro Mini

I bought this small board Arduino Mini (the right board, not the left board which is just a power regulator) from eBay from China for less than $2 plus S/H.  The bareboard has SMD version of Atmel AVR 828p, a RESET switch (left), and bunch of I/O ports.  The board seems a clone of what Sparkfun has (see https://www.sparkfun.com/products/11113)

Specifications:
  • 20 Digital input / output ports:TX, RX, D2..D13, A0 .. A5
  • 8 analog inputs ports:A0 ~ A7
  • 1 pairs of TTL level serial transceiver ports RX / TX
  • 6 PWM ports: D3, D5, D6, D9, D10, D11
  • Main Chip: Atmel Atmega328P-AU
  • Support Serial Download
  • Support external power supply 3.8-12V DC
  • Support 12V or less than 12V battery power supply
  • 16MHz clock frequency
  • Size: 33.8mm x 18mm
  • Supports auto-reset
  • Max 150mA output
  • Over current protected
  • Weighs less than 2 grams

When supplying unregulated power to the board, we should connect to the “RAW” pin and not VCC.
I/O pins are labeled "D0", "D1", ... "D13" for digital I/Os, and "A0" to "A7" for analog inputs.  There are two TRO and RXI pins.


Label on BoardFunction(s)
A0ADC0
A1ADC1
A2ADC2
A3ADC3
A4ADC4/SDA
A5ADC5/SCL
A6ADC6
A7ADC7
RXID0/RXD
TXOD1/TXD
D2D2/INT0
D3D3/INT1
D4D4/T0
D5D5
D6D6/OC0B
D7D7/IN1
D7D8/ICP1
D7D9/PCINT1
D7D10/PCINT2
D7D11/PCINT3
D7D12/MISO
D7D13/SCK/LED

Sunday, January 31, 2016

Raspberry Pi vs. Next-Big-Thing's CHIP SoC Computer


Feature
RPI 1 Model A
RPI 1 Model B
RPI 1 Model A+
RPI 1 Model B+
RPI 2ModelB
NBT CHIP

SoC
BRCM 2835
BRCM 2835
BRCM 2835
BRCM 2835

AllWinner's R8
Standard SoC Speed (MHz)
700
700
700
700
900
1000

RAM (MB)
256
512
256
512

512
Ethernet (Mbps)
N/A
100
100
100
1000
N/A

HDMI output
N/A
Yes
Yes
Yes
Yes
With extra module

Composite Video out
Yes
Yes
via 3.5 mm jack
via 3.5 mm jack
via 3.5 mm jackYes

Number of USB2.0
2
2
1
4
4
1

CPU Cores111141
StorageSD CardSD Cardmicro SDmicro SDMicroSDBuilt-in Flash
Internal Storage CapacityN/AN/AN/AN/AN/A4 MB
Camera Interface (CSI)
yesyesyesyesyes
Display Interface (DSI)
yesyesyesyesyes
Video/Graphic CoprocessorVideoCore IVVideoCore IVVideoCore IVVideoCore IVVideoCore IVPowerVR SGX544
ArchitectureARM11v6ARM11v6ARM11v6ARM11v6ARMv7ARMv7
GPIO Pins2640404040

Thursday, September 10, 2015

OpenFrameworks: Another cool Multi-platform Framework for Graphics

Steps to download and build OpenFrameWorks:
  • git clone https://github.com/openframeworks/openFrameworks.git
  • goto the OF root.  This is usually the folder openFrameworks.  Change directory to ./scripts/linux/ubuntu (e.g: cd openFrameworks/scripts/linux/ubuntu)
  • Execute the scripts in the folder as root:
sudo ./install_dependencies.sh
sudo ./install_codecs.sh

Go to ./scripts/linux and execute:

./compileOF.sh
./compilePG.sh

To generate projects (Makefile etc.)  for all the examples, goto OF root, then type:

projectGenerator -v -r examples/

wxWidgets 3.0

To add the repository, first import the key:
sudo apt-key adv --fetch-keys http://repos.codelite.org/CodeLite.asc
 
Then add the source:


sudo tee /etc/apt/sources.list.d/wxwidgets.list
deb http://repos.codelite.org/wx3.0.2/ubuntu/  $(lsb_release -sc) universe
sudo apt-get update

Install wxWidgets modules:

sudo apt-get install libwxbase3.0-0-unofficial libwxbase3.0-dbg libwxbase3.0-dev libwxgtk3.0-0-unofficial libwxgtk3.0-dbg wx3.0-doc wx3.0-examples 

Create soft-link:
sudo ln -s /usr/include/wx-3.0-unofficial/wx /usr/include/wx 
To compile a single file, create a script named wxcompile and edit it with the content as below (assume with have subdirectory obj/Debug and bin/Debug:

#!/bin/bash

if [ -z "${1}" ]
then
    echo "$0 "
    exit 1
fi

FILE=`basename $1`
CPPF=$FILE
OBJF=`basename -s .cpp $CPPF`
OBJF=${OBJF}.o
g++ -g -c -Wall -DWX_PRECOMP -Winvalid-pch `wx-config --cppflags` -o obj/Debug/${OBJF} ${CPPF}


To link, create a script file name 'wxlink' and its content as below:



#!/bin/bash

if [ -z "${1}" ]
then
    echo "$0 "
    exit 1
fi

FOUT=$1
OBJF=obj/Debug/*.o

g++ -v obj/Debug/*.o `wx-config --libs` -o obj/Debug/$FOUT

For a bigger project which requires more complicated and conditional compilation, use Makefile.

Friday, July 3, 2015

Watching Nabawi-TV via VLC on Raspberry Pi

A new Indonesian da'wah TV has provided a streaming.

To watch, install vlc.  Once installed, open the VLC, click "Media", and then "Open Network Stream".  Enter:

rtsp://wowza60.indostreamserver.com:1935/nabawitv/live