Category Archives: Technology

Tips and test on technological product and components. Operating system, networks, hardware, security…
Astuces et tests autour de produits et composants technologiques, systèmes, réseaux, hardware, sécurité …

Raspberry PI – receive 433Mhz radio signal

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Tonight, the hack objective is to communicate with 433Mhz equipments using Raspberry PI. For this, I use a 433Mhz receiver from Itead Studio bought at hack spark for 4.5€ with an emitter. Cabling is simple : VDD on 5V (I tryed to use 3.3V supply voltage but as a consequence the reception range is limited to a couple of cm) , GND goes to GND and One of the data pin going to pin 13 (gpio21/27). This is following elements found on that site : ninjablocks

If you are looking for a RF433 shield for Raspberry, check this link to another article !

The first step is to install a fresh wheezy raspbian environment and get the basis element to work :

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Raspberry PI – GPIO and temperature sensor

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Some new hacking on Raspberry PI, the objective is to get a TC74A5 3.3VAT temperature sensor working with a RPI. This sensor is a digital sensor type 2 wires I2C operating at 3.3V with a precision of 2°C.

Read next to get details

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BeagleBone Black temperature sensor

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Here is a quick hack to interface a temperature sensor to a BeagleBone Black unit.

I choose to use a Microship TCN75AVOA component. This SMS component is not really easy to use for prototyping but feasible. This component have a unit cost < 1€ and operate at 5V or 3.3V (as for BeagleBone). A Dip8 version exists. The communication with the CPU is numerical based on a two wire connection type I2C. It measures from -40°C to +125°C on 8b + 4b decimal with +/- 1°C precision.

Read next :

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BeagleBone Black – playing with I/O

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Tuesday hacking evening is tonight to get start with BeagleBone as my RPI is not available for the project I have in mind. So the objective today is to get a LED blinking on BBB board.

Read the full article for details

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Raspberry PI – wan emulation

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piwan.org

piwan.org

PIWan project : Here is a new, quick & dirty project to be done with a raspberry PI : At work we currently have to simulate our application for a worldwide usage. We have really great tools for that but they need expertise and specific campaigns. The purpose of this document is to describe a RPI based solution with two Ethernet cards and some clever command lines to simulate a wan network for developers. The advantage of this solution will be to cost less than 100euros and will be easy to use with the right documentation.

See next pages for implementation details:

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BeagleBone Black – configure NTP client

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The BeagleBone black do not have Real Time Clock and as a consequence each time you reboot, you’re back at time 0. To get it updated to the local hour, you can configure NTP client (if connected to network) using the following commands:

root@beaglebone:~# opkg update
root@beaglebone:~# opkg install ntp ntpdate
root@beaglebone:~# mv /etc/localtime /etc/localtime.old
root@beaglebone:~# ln -s /usr/share/zoneinfo/Europe/Paris /etc/localtime
root@beaglebone:~# killall -KILL ntpd
root@beaglebone:~# ntpdate pool.ntp.org
root@beaglebone:~# /etc/init.d/ntpd start
root@beaglebone:~# date
Sun Jun  2 17:41:10 CEST 2013

BeagleBone Black – upgrade linux

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One of the first things to do is to upgrade the Linux embedded in the BeagleBone Black device, The documentation provided for Windows is not exactly clear and complete for Linux, so here is the process à followed :

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BeagleBone Black – General Overview

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I just got my BeagleBone black device, this is really looking like a Raspberry PI, but personally I found multiple advantage for this card compare to RPI, the first one is related to the embedded 2GB of flash memory that do not require to add external storage. Thank to that, for the first start, you just need to connect the device to your network and a screen and it run ! After about 30s you are connected to a graphical interface and able to surf the web.

The first issue I got with this device is the micro-hdmi connector located really close to the USB connector, due to the current use of an micro-hdmi 2 hdmi adaptor, i’m not able to connect correctly a USB device.I highly recommend to use a micro-hdmi cable instead of a monoblock micro-hdmi to hdmi adaptor for this reason.

By the way, the device is accessible using ssh (root/rootme) and display can be exported easily.

The next part of the article will be about different comparison between BeagleBone and other systems like Raspberry Pi.

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