Photodiode amplifier design

Craig writes, “I recently designed an infrared sensor board (dubbed “IRis”) for my friend’s Defcon talk. This video walks through the circuit design of the photodiode amplifier, and discusses some of the pitfalls associated with photodiode amplifier design.” More details at Analog Zoo homepage.  All project files are available on github.

Tutorial: power line communications

Andrianakis Haris produced this detailed article while completing a thesis toward a B.Sc in Department of Electronic Computer Systems Engineer at Technological Education Institute of Piraeus, Greece. “Power line comnunication (PLC) is the technology that allows data transmission over the existing Power Line network. Power Line can be the home power network or the national […]

MiniBasic on STM8

Joaquim reports, “Since I have the STM8S-Discovery I wanted to make a simple version of a BASIC interpreter for it. Had initially thought about converting BASIC to run on the ZX80 STM8S but eventually put that idea aside. Luckily I found this version on the net (Arduino Basic), and after some adaptation could include new […]

DEFCON 20: Hacking Measured Boot and UEFI

UEFI secure booting has been on the minds of many hackers and open sources advocates. Some believe that it will lock out certain operating systems in favor of vendor’s proprietary systems. (There have even been recent reports of bricking Samsung laptops just by trying to boot Linux.) In this video from last Summer’s DEFCON 20 […]

Testing the new reduced-sized ICSP connector

This week we received a batch of PCBs and amongst them was the latest revision of our USB TFT breakoutboard. This board is the first board that features a new ICSP footprint, which occupies less space on the PCB and should improve testing and programming times at Seeed.

Adaptive brightness control for seven segment LED displays

Raj made a temperature and relative humidity meter to demonstrate adaptive brightness control on a seven segment LCD. The system uses a LDR light sensor in a closed loop to continuously adjust the brightness of the LEDs. The objective of this project is to illustrate a technique of implementing adaptive brightness control to seven segment […]

Dongle Shootout: Funcube vs RTL SDR

Kanal von MegaOscarVideos from Germany presents a two-part video comparision of the Funcube dongle and a RTL-SDR DVB-T dongle, in this case a Hama Nano version. The two devices are connected to the same antenna and using identical test systems from a geostationary INMARSAT satellite to compare received signal to noise ratios (SNR).

ATMega328 RC vs quartz oscillator comparison

Kenneth compares the RC oscillator found on the ATMeg328 against an external quartz crystal. As expected there is a huge difference in precision and stability between the two. This really demonstrates how both oscillators, but particularly the internal one, are very sensitive to temperature changes around the microcontroller.  This is why my counter’s oscillator is […]

FireHero – Arduino and guitar play with fire

Chris Marion has developed an impressive and dangerous project: FireHero. It uses a complex propane system and some electric valves coupled to an Arduino controller that hooks directly into a “guitar” – a Guitar Hero input device, hence the project name “FireHero”. The result is that the notes played directly affect the flames. Now that’s […]

Interfacing CMOS cameras to 8bit microcontrollers.

Here is an article from IKALOGIC describing how to implement CMOS cameras as sensors in 8bit microcontrollers. Processing color video in real time requires powerful  DSPs or MCUs, but by downgrading the image to gray-scale, and using a lower resolution, processing becomes much easier to handle, so even small 8bit MCUs can handle it Many […]

Replay your terminal sessions and share them online

PLAYterm is a site dedicated to storing, replaying, and sharing terminal logs. When replaying your session, the code is read line by line, thus providing a more intuitive way of reviewing your logs. PLAYTERM is intended to raise the skills of terminal  CLI users, share their skills and inspire others. PLAYTERM wants to push forward […]

iOS communicating with Arduino demonstration

This video from OSCON, the Open Source Convention, features Alasdair Allen demonstrating the use of Maker Shed’s RedPark Breakout Pack for Arduino and iOS. This demo the Redpark Serial Cable for iOS, which is an Apple-approved cable for connecting your iOS device to almost anything using serial communication. For more information and a link to […]

Bus Pirate week, day 5 – measure a capacitor and parts unboxing

This week is dedicated to Bus Pirate development. Today we hacked the Bus Pirate to do crude capacitor measurement. You could use any microcontroller to do this, but one nice thing about the PIC24FJ is that it has a 32bit timer to measure large value capacitors. In the video: How to measure capacitors with the […]

NBW-SDR: NBitWonder software defined radio

NBitWonder writes: Over at NBitWonder, we have been working to develop a software-defined radio for a few months. Last weekend, the radio received its very first signals. There is a short writeup and demonstration video at our website. This is quite similar to Jeri Ellsworth’s design in that is uses a Tayloe detector and some […]

DIY aerial drone spoofs cell towers, hacks wifi + Bluetooth

You’ve probably seen aerial surveillance drones. You also probably know that GSM towers can be spoofed to fool unsuspecting users into connecting and having their phone security compromised. Well at this year’s Blackhat conference recently held in Las Vegas, security researchers Mike Tassey and Richard Perkins demoed their Wi-Fi Aerial Surveillance Platform (WASP) capable of […]

Canadian lab prototypes “PaperPhone”

Cellphones have been getting lighter and smaller with each new release. If researchers at Queen’s University in Ontario, Canada have their way, the next gen phones will be paper thin. They recently unveiled the prototype of their “paperphone”, a smartphone prototype using a 3.7″ electrophoretic E Ink display which was built with E Ink’s Broadsheet […]