Tag Archives: Arduino Alarm

Rewind: 12 projects you wish you had in your office

Whether it’s eliminating distractions or enhancing convenience, every workplace could use some of these things.

An Electric Standing Desk


StandiT is a modular, patent-pending system that can take ordinary desks or wooden tabletops and transform them into electric stand-sit desks capable of raising and lowering on your command.

An Ergonomic Keyboard


Keyboardio is an open source ergonomic keyboard that gives your pinkies a break and puts your thumbs to work.

A Listening Table


The brainchild of the New York Times R&D Lab, the Listening Table is like any other piece of office furniture except for the fact that it can record the most important moments from a meeting. A microphone array focuses on the speaker, no matter where he or she is seated, while custom speech-processing software generates a word-for-word recording and a semantic overview — what topics were talked about, in what order, and by whom.

A Connected Coffee Pot


You’ve all been in the situation before: You arrive at the office coffee pot only to find that it’s empty. If only you could curb that disappointment with up-to-the-minute reporting on exactly how much coffee is left in the pot. Well lucky for you, PubNub has developed an IoT Coffee Maker with real-time coffee capacity monitoring.

A Coffee Age Timer


In most offices, coffee tends to go pretty fast throughout the morning. However, as the day goes on, caffeine consumption dwindles down a bit. And when it’s time for that late afternoon pick-me-up, it’s sometimes difficult to guess just how long the coffee has been sitting in the pot. Fortunately, Paul Kerchen has created a solution to keep track of that: BrewDoo.

A Boss Tracker


Ever wonder whether or not your boss is in the office? As part of a recent demonstration, the Atmel team in Norway built a SAM D20 GPS tracker that lets you receive an SMS alert whenever your supervisor enters the building.

An Arduino Alarm System


Hate when your colleagues steal things from your cubicle without asking for permission? Thanks to Stefano Guglielmetti, you can now devise your own Arduino Yún (ATmega32U4) alarm. Discreetly place the device around whatever it is that you’d like to monitor. If and when movement is detected, the alarm will emit a siren and then proceed to take a picture and email it to you. What’s more, you can shame the thief by automatically posting their photo to friends on Facebook or Twitter via a simple IFTTT recipe.

A Productivity Sign


Every office has that one guy. He walks around the floor, gazing into each cubicle, looking to spark a conversation. Not before long, he glances your way, makes eye contact and begins to head in your direction. As he approaches, he utters the infamous words, “It’ll be quick.” But let’s face it, it’s never quick. An hour later, not only has he drained you of your creative energy, but you just lost 60 minutes of productivity. Wired In is a Bluetooth sign that eliminates unwanted distractions by telling your coworkers you’re busy.

A Personal AC Unit


Especially in the summertime, finding the perfect indoor temperature to accommodate others can be quite challenging. Some buildings blast the AC to help with airflow, but this results in goosebumps even when it’s hot outside. Evapolar is a personal air conditioner that humidifies and purifies the air around you. The gadget sits on your desk, enabling you to enjoy your own climate, tailored to your temperature needs.

A Real-Time Commute Display


Transit is a conveniently-placed sign displaying commuter information from the web every 30 seconds. Although most of us can simply glance at our smartphones to check public transportation updates and weather forecasts, it’s easy to forget to do so when ‘in the zone.’ Sometimes, the only way we pay attention is when that information is served to us conspicuously. That was the thinking of iStrategyLabs, whose project ensures that you never miss a train, always know how many bikes are available, and stay one step ahead of the weather.

An Office Chairiot


Sitting behind the same desk in the same chair can get a bit boring after a while. What if that same chair could whiz through the building at 15 to 20 miles per hour? Meet the Office Chairiot Mark II — a motorized IKEA Poäng chair that employs some off-the-shelf scooter parts like wheels, axles and batteries to roll around.

A ‘Skip Track’ Target


Hate a song playing on the radio? Hope you have good aim! The Neo-Pangea crew’s Boombox Blaster adds a gamification element to their workplace’s music selection by turning a suspended NERF target into a “skip track” button.

Protect your things with this picture-taking alarm

This Maker built a simple, Wi-Fi-enabled alarm system with Arduino. 

For those of you tired of your roommate using your things, colleagues taking snacks from your cubicle or classmates stealing stuff from your locker, Stefano Guglielmetti has come up with the perfect solution. That’s because the Maker has developed an Arduino-based alarm system, aptly dubbed You Can’t Touch This! 


With an Arduino Yún (ATmega32U4) at its core, the system is comprised of a PIR sensor, a camera, speakers, a microSD card and an optional USB hub. The idea is pretty straightforward: You discreetly place the device around whatever it is that you’d like to monitor. When movement is detected, the alarm will emit a siren and then proceed to take a picture and email it to you. What’s more, you can shame the thief by automatically posting their photo to friends on Facebook or Twitter via a simple IFTTT recipe.


Even better, the entire project is made up of only a handful of steps. These include configuring the Arduino, installing the camera and sound card, snapping a test pic, running an email script, building the circuit and finally uploading the Sketch to the Yún. Lucky for you, Guglielmetti has shared the entire process on MAKE:including its code and schematics.

Let’s just say, install this alarm in your room, apartment or cubicle, and no one will take your belongings again.

Building an Arduino-based alarm shield

Maker develops an anti-theft alarm shield compatible with a range of sensors, RFID, GSM and a web server.

No stranger to the Hackaday Prize, a Maker by the name of “IngGaro” has developed an Arduino-based anti-theft shield that offers users many of the same functions as a commercial home automation system for a fraction of the cost.


Simply put, the project is a shield for an Arduino Mega (ATmega2560). The unit includes connections to an alarm, a GSM modem, temperature and humidity sensors, magnetic and IR movement sensors to detect tampering and intruders, as well as an Ethernet module, a siren and a small UPS 2.2Ah battery for power. The Arduino discreetly attaches to a remote control box mounted near the front door, which boasts an LCD display, an NFC and RFID reader for authorization, a speaker for feedback, and capacitive buttons to arm and disarm the system.

“The panel is connected to the shield with a long 2/4 wire cable. The result is pretty good and it works perfectly. Since the I2C cable that connects to the main circuit is long, more than [the] I2C specification, I planned to add some kind of serial translator,” IngGaro explains. “However, it already works perfectly so I didn’t need it; the only trick to make it working fine was to add some capacitors to the magnetic sensors pins near the Arduino, since the rolling shutter electric motors randomly introduced some noise that caused I2C errors.”

The whole system can be remotely managed from a web-based interface or a smartphone via its app. When activated, owners can receive notifications by way of text message and email. It also connects to other in-home automation systems, which allows the DIY device to do things like open/close the blinds, turn on/off lights, control security cameras and monitor the temperature and humidity inside the house. What’s more, users can even manually trigger the alarm to sound for “emergency purposes.” Pre-set times and other options are fully programmable and stored in the Arduino’s EEPROM.


What’s nice is that users can choose to enable both perimetral and volumetric sensors, or just perimetral only if they’re in the house, and then activate it with NFC. This will trigger a predefined domotic action, like closing the rolling shutters and turning off all the lights, and then provide an owner with a pre-defined amount of time to exit the house — no different than the grace period in traditional systems.

“If some windows (perimetral sensors) are opened before activating the system, they’re automatically disabled until they’re closed again. If you open a windows, the alarm sounds immediately; if you open the door (e.g. coming back home) or move in front of a volumetric sensor, you have a (configurable) amount of time to disable it. You can also configure how many consecutive times the siren will be activated on alarm, for how long, and the ‘pause’ length between two alarms,” IngGaro writes.


Beyond that, the anti-theft shield’s software was written with Arduino IDE. According to the Maker, he employed the help of several libraries, including UIPEthernet for Ethernet, time and timezone for time management, and LiquidCrystal_I2C for LCD, among a few others.

“The system configuration (sensor number/type, authorized NFC IDs, etc.) has to be hard-coded in the Arduino code in some proper sections; system options (siren duration and other timings, domotic control, etc.) may be runtime configurated through the web server, and will be stored in the Arduino EEPROM. Date and time are automatically and periodically acquired with NTP,” he adds.

Intrigued? Head over to the project’s page on Hackaday.io here.