Boris Landoni writes:
It’s small but packed with features. The GSM alarm we present today, sports a PIR motion sensor, can be battery operated and it’s capable to communicate via GSM. It can transmit alarm conditions and receive commands from remote. It’s also capable to indicate problems such as is insufficient voltage supply or tampering.
It’s not so conventional for antitheft system: to integrate a movement sensor, a PIR motion sensor and a temperature probe in a single appliance: all this accompanied by an SMS sending GSM / GPRS module. This circuit was born as a very versatile, ready to use, built-in alarm system: no installation is required, you can just drop it and it’s ready to work. It’s not by chance that is designed to be battery operated: it also features a battery state control to check the power.
GSM Multifuction Alarm with SIM900 - [Link]
patrick @ plainlystated.com writes:
I bought an antique telegraph sounder a while back, and I’ve been working on a project that will click out emails from my Etsy store when I get an order. I’ve gone through several generations, and come up with something I really like. What follows is a description of my process for going from concept to finished piece. The code & PCB are open-source, and can be found on my github.
Generation 1 – Paper
The end goal I had in mind was to be able to push messages over the network, and have the telegraph sounder tap them out in morse code …
Concept to Finished Piece – Generations of an Electronics Project - [Link]
iFixit dives into their 5th Gen iPod Touch 16 GB teardown with the usual gusto–here are excerpts.
Teardown: 5th-gen Apple iPod Touch - [Link]
Asgard build this Rapper project:
What this is, is a small device that records a command sequence for a TV remote control, then emits the same sequence when activated by a pulse detected in a piezo transducer. Such pulse can be as simple as rapping your knuckles on the table where the Rapper is placed. Typically the Rapper would record the mute control for the TV, so that you can run to get the phone without having to hunt down the remote control for the TV. Cute, eh?
Rapper project - [Link]
Have you ever wanted to send data from a sensor or project wirelessly? This simple circuit allows you to build your own wireless transceiver using two ICs, a transistor, and two resistors. The IC is from Melexis and uses On-Off Keying modulation and can be battery powered.
Here is the circuit.
DIY Wireless Data Transceiver - [Link]
Recently many little boards running Linux appeared across the globe. These boards may prove useful for many projects and for teaching Linux OS to any enthusiast out there. But how we got there? Read about the road to development of these embedded computers. (by Publitek European Editors)
Linux has long been on the edge of breaking into embedded systems, but one barrier has been the lack of affordable development boards with fast enough processors and large enough storage to cope with Linux. In the last few years, the situation has changed and there are a number of low-cost development boards, each with an array of plug-in peripherals and carrying processors with the power and memory to comfortably execute Linux-based applications. This article will look at BeagleBoard/BeagleBone and PandaBoard. It will also look at a manufacturer’s approach to the same problem – The Freescale Tower development system with a special emphasis on the MPC8309 PowerQUICC II Pro processor.
Linux and the Road to Development - [Link]
element14 is proud to offer an advanced “first look” at the next-generation BeagleBone – one of the most popular open source hardware platforms developed. The new BeagleBone boasts even more memory and higher performance than previous generations.
Availability is slated for the April timeframe, but students and hobbyists can register thier interest in receiving a BeagleBone now on the element14 engineering community. Plus, leading up to the official launch, open hardware enthusiasts and BeagleBone fans are invited to join element14’s Open Source Group to share ideas, exchange code, read reviews of the device, and sign up for the free Engineering 101 webinar series produced by the top experts in the electronics industry.
element14 offers sneak preview of next-gen BeagleBone - [Link]
Common methods of reverse-voltage protection employ diodes to prevent damage to a circuit. In this article alternative methods of using relays are discussed. This way achieve zero voltage drop on the circuit and effectively protect the system.
Simple reverse-polarity-protection circuit has no voltage drop - [Link]