Multi-homed Internet Connectivity using BGP

Connectivity to the Internet through more than one upstream ISP (Internet Service Provider) is referred to as multi-homing (or dual-homing in case of two ISPs). Multi-homing is generally required to increase the reliability of the Internet connection by reducing the reliance on a single provider and eliminating single-point-of –failure in the IP network. Dual- or ...

Software Defined Networks (SDN)

The Open Networking Foundation (ONF), the organization dedicated to the promotion of SDN, defines Software-Defined Networking as the “physical separation of the network control plane from the forwarding plane, and where a control plane controls several devices.” This separation allows that control functions of the networking devices to be programmable dynamically and from a centralized ...

Arduino robot kit – Line Following

Arduino robot kit – Line Following
<first published on Dec 26, 2012> The Robot kit I’m building comes with three IR line tracking sensor modules. As with the other components, documentation is only available on the web. I have not found a source of information about how to use the sensors but it doesn’t seem to be that complicated. – UPDATE ...

Arduino IR Receiver Module

Arduino IR Receiver Module
This post describes how to use the Keyes IR Receiver Module in a practical application.  The setup used in this experiment is shown in the picture to the right and it includes Arduino UNO card (hidden under an Ethernet shield), a display module JY-LKM1638, a Keyes IR Receiver module and a remote controller. The last two items ...

Arduino robot kit – Bluetooth Remote Control

Arduino robot kit – Bluetooth Remote Control
The Amarino app mentioned used in the previous post translates the sensor inputs of an Android phone ( and other events such as SMS messages) into messages sent to the Arduino via Bluetooth. In this post, I will use the orientation sensor on my phone to drive the Arduino Robot. The orientation sensor on the Andriod platform provides yaw, ...

Arduino robot kit – Bluetooth Module

Arduino robot kit – Bluetooth Module
The Arduino robot kit includes a Bluetooth-Serial Converter Module JY-MCU (mine says BT_BOARD V1.04). After some Google search, I found information about how to setup this module. See this for example, which also has a good link about how to change the default configuration of the module. In this post, I am going to provide ...

Arduino robot kit – Autonomous Motion

Arduino robot kit – Autonomous Motion
At this point, we can put the motion and the range sensing capabilities of the robot to good use. For autonomous motion (no remote control), the robot needs to use its range sensor to detect obstacles and avoid them by turning to another direction. The next sketch does that by moving the robot forward while reading ...

Arduino Relay Module

Arduino Relay Module
A relay can be used, for example, to control the power to a small home appliance. I used this Arduino 2-Channel Relay Module (AC 250V 10A / DC 30V 10A) to control multiple appliances by replacing the mechanical on/off switch of a regular power bar with this relay. The control of the relay by an Arduino microcontroller is straight forward. ...

Arduino robot kit – Wiring Diagram

Arduino robot kit - Wiring Diagram
I have created this wiring diagram for the connections between the motor controller, motors, and sensor shield. I’ll update it later to include other components. And here is an update that includes the servo motor and the range sensor. And here are the detailed pin assignments for all modules: Pin Assignment Arduino Pin Description Motor ...

Colour Donut

Colour Donut
This is a fun program that shows how easy it is to create interesting animations using Processing language.