Electronics-Lab.com Blog

mattwilliamson/arduino-sms-alarm.

An Arduino based burglar alarm that sends an SMS when motion is detected. It will send an SMS to you every 30 minutes while motion is detected (configurable).

Arduino burglar alarm sends SMS - [Link]

The STD32 offers the user the possibility to remotely switch ON or OFF electronic devices and to receive alarm messages via (SMS). You can switch devices either with an SMS or using a simple voicecall. Alarm messages (SMS) can be received with any mobile phone supporting SMS functionality.

With the new generation of the STD32 you now also have the possibility to receive alarm messages via e-mail. With the help of the digital camera which is available as an accessory, pictures can be taken and sent via e-mail triggered by an alarm.

The STD32 has an integrated webserver which allows direct access to the device via the internet and a standard webbrowser (e.g. Internet Explorer or Firefox) from a computer or a mobile phone with web functionality. Thus it is very simple to switch electrical devices remotely and to change the configuration of the STD32 from anywhere.

Simple GSM control

• New! Fixed IP address (in-built server)
• New! Camera interface (sends still images via email)
• Two alarm inputs, e.g. for movement, vibration, temperature or moisture sensors
• Two relay outputs, potential-free max. 6A/250V
• Alarms via text message
• Remote setting of parameters (on times, etc.) possible
• Five alarm addresses
• Basic functions can be activated by telephone with no call charge
• Online configuration via the internet
• Camera and built-in box available as accessories
• Supplemented with SIM cards

STD32IP Remote Controlling /Alarm for GSM Network - [Link]

jumperone.com writes:

Well, basically break beam sensor consists of two parts: transmitter and receiver. Transmitter emits light (it could be, for example, an LED or a laser) and that light goes to receiver. If that light beam between transmitter and receiver is broken by some obstacle, and receiver detects no incoming light even for a brief moment – it triggers an alarm (or any load you want). For example you can count people that entering some room, or you can use it as an alarm system, yeah, just like in movies!

First thing that comes to mind is to connect LED or laser to DC power supply on transmitter side, and use phototransistor with an amplifier on receiver side. But that is not gonna work with changing ambient light level. For example you calibrated your amplifier to work on a cloudy day, and then bright sun shined at it and in this case it won’t trigger an alarm because it already has sufficient level of incoming light.

Break-Beam Sensor - [Link]

Professor Mark Csele writes:

Presented is a simple temperature alarm which uses a PIC16C84 microcontroller and a 2-line LCD display. The alarm displays current temperature in both Celsius and Fahrenheit degrees and features a 3-key keypad which allows the user to set independent high and low temperature alarm points. The alarm also records the minimum and maximum temperatures encountered.

A PIC-Based Temperature Alarm - [Link]

Mike Krumpus of Nootropic Design (and creator of the Video Experimenter Shield which is the heart of Matt Richardson’s Enough Already hack) is at it again with his Defusable Clock: [via]

I thought it would be fun to build an alarm clock that looks just like the type of bomb that we always see in Hollywood movies. I certainly don’t know anything about how a real bomb might look, but in the movies they always have sticks of dynamite strapped together, a red digital readout, and a bunch of curly wires. Instead of just building an ordinary clock, I thought it should have a detonation sequence with a scary countdown just like in the movies. And why not make it “defusable” so I can try to stop the countdown by cutting the correct wire?

Defusable Alarm Clock is Dy-No-Mite - [Link]

Ruijc writes:

This week’s project is an alarm simulator for car or motocicle and it couldn’t be more simple.

The microcontroller used was the 10F222 from microchip which it’s SMD ( SOT-23 )version only has 6 pins.

Car alarm simulator - [Link]

Ruijc writes:

This was a project made as a request.

The idea was to build a circuit that was capable of simulating a tripwire trap. This type of of trap uses a wire placed 20 centimeters above the floor strapped to some bars or trees. When the intruder enters the protected area he trips on the wire and activates the alarm.

Laser tripwire with Alarm - [Link]

embedded-lab.com writes: [via]

MikroEleketronika demonstrates how to build a simple home alarm system that has the capability of sending SMS to a predefined cell phone number when intrusion is detected. This project is based on StartUSB for PIC board, a small development board for PIC18F2550, which is preprogrammed with an USB bootloder so that no additional programmer is required to load the firmware. The SMS portion uses a SmartGM862 Board, which is a full-featured development tool for the Telit’s GM862 GSM/GPRS module. All the boards required for this project can be purchased as SMS Home Alarm Kit from mikroElektronika. A demonstration software for PIC is also available for free. They are offering free shipping now.

Make your own motion sensor alarm with SMS feature – [Link]

Markus shared his DIY alarm clock using an MSP430 in the project log forum. [via]

MSP430 bedside table alarm clock – [Link]

The folks at Adaptive Path made a fridge alarm with a magnet + hall effect sensor, a buzzer, an Arduino, and an Adafruit Proto Shield. Dane writes: [via]

At Adaptive Path’s San Francisco studio, we had a fussy refrigerator that wouldn’t always latch when it was shut. Sometimes the fridge would sit open for hours, spoiling food and wasting all the unicorn tears and panda fur oil, before someone would discover it had been left open.

Like any good tinkerers we fixed the problem with technology, devising an alarm that would let us know when the fridge had been left open for too long. Whenever the pleasant sound of the 80s echoed through the office, we knew the fridge needed our attention.

Adaptive Path Fridge Alarm – [Link]