Arduino Sonar

This is a fun project I made with an Arduino UNO. It's a simple Sonar using an ultrasonic sensor.   Arduino Arduino is an open-source hardware/software platform based on Atmel ATmega, being an open-source fanatic I couldn't resist buying it :) it's remarkably easy to learn, given that this is my first Arduino project and it took just a couple of hours ! Arduino is  programmed in a language based on Wiring. ...

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Introduction to ARM Cortex-M3 Part 1-Overview

Hello, this is an introduction to the ARM Cotrex-M3 microprocessor. In the first part we'll talk about the core features of the Cortex-M3, the LPC1768 MCU and the prototyping board mbed, if you decide to get started with ARM this series should have a fair amount of information to help you do so quickly... have fun :) Cortex-M3 overview The Cortex-M3 is a 32-bit microprocessor made by ARM based on the ARMv7 architecture, this...

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How To Read SMS Messages From Huawei E620 Modem

I always wanted to read SMS messages from my Huawei modem on Linux but unfortunately It seems that they only support Microsatan Winblows... Anyway, while I was trying to read /dev/ttyUSB2, I was connecting a usb gadget with serial over usb, I got a of bunch of gibberish messages, I found out, beside the fact that the usb gadget didn't work :D, that the Huawei supports serial over usb ! it also seems that I have been in a cave,...

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Writing a Debugger

You must have debugged your code using gdb before or traced some process with strace, if so, you must wonder how it works ? well it's not magic :) and it's not really that difficult either ! Today I'm going to walk you through writing a debugger, it's a small, yet completely functional, debugger, called mdb, using a mixture of ptrace, libbfd and libopcodes so enjoy... :) Overview The task of writing a debugger can be broken...

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RN-41 Bluetooth Module

Recently I've been playing with the RN-41 bluetooth module from sparkfun, this module is really easy to use, it requires just a couple of connections to work and implements the SPP (bluetooth serial profile) with TTL levels so it's perfect for a pic project :) This is a little how-to on configuring and interfacing with the RN-41 module.The circuit This is a typical pic microcontroller circuit with a 3.3v voltage regulated power...

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X86 Machine Code

A while ago someone asked how to encode/execute x86 machine code, I replied with a small tutorial on the subject, which I thought I should expand and share here X86 instructions can range from 1 byte to 15 bytes long, an example for 1 byte instruction is the NOP (no operation instruction 10010000b or 0x90h), in general/from a bird's eye view x86 instructions format looks like this:byte: 0,1,2,3 4,5 6 7 ...

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