Skip to main content
  1. Home
  2. Photography
  3. Mobile
  4. Smart Home
  5. News

Zensors app uses your old smartphone and crowdsourcing for smart surveillance

Add as a preferred source on Google

Want to know how many times your cat jumps on the counter when you’re not around? Or, maybe you want to quantify the distraction you experience at work by counting the number of people who walk by your cubicle. Now there’s an app for that. Zensors, created by a research group at Carnegie Mellon University in participation with the Yahoo InMind Project, uses your smartphone’s camera to capture data, and then uses artificial intelligence and crowdsourced input to analyze it.

The app, currently in beta, uses your phone’s camera to monitor the action. You can set up an area on the phone’s touchscreen for the application to pay particular attention to. A Zensors demo used a parking lot as an example, where the user defined a certain parking space, or group of spaces, to watch for a period of time. Data is then analyzed by set parameters, such as how many cars park in a certain spot over a period of time.

Recommended Videos

You can use your current phone, though the group behind Zensors suggests that this is a practical use for an old smartphone that you no longer use. You can set it up to be a dedicated data collector; if you use your current device, you may interrupt your data collection activities when you receive a text, or have to walk away from the scene.

zensors
Image used with permission by copyright holder

The data is crowdsourced, because certain questions are not easily answered by the simple action of an object on the screen. One of the creators, Chris Harrison, assistant professor of human-computer interaction at Carnegie Mellon, writes on his profile page that certain sensors, such as a simple open/close door sensor, does not answer the question of whether someone’s children are home from school (although you might want pick who you want to crowdsource on that query). Another example is which patrons at a restaurant need their drinks refreshed. There are business and practical applications for the Zensors app.

For the crowdsourced monitoring, the job could be done by an outsourced staff that watches for activity. At the same time, the app’s algorithms are learning from the humans; over time, some of those human-based activities could become automated.

Crowdsourcing is sometimes necessary. Harrison notes that advances in sensing, computer vision, and machine learning are quite advanced, but not quite there yet to address the queries people might use the app for.

Zensors was built for use with unused smartphones, but will also work with a Wi-Fi camera such as a Dropcam. The site says users can set alerts by email or text, and adapt the app using the available API.

Enid Burns
Former Contributor
Enid Burns is a freelance writer who has covered consumer electronics, online advertising, mobile, technology electronic…
I found 8 early Prime Day camera and creator gear deals I’d actually buy
Cameras, mics and webcams are already getting cheaper before Prime Day
Prime Day Camera Deals

We are nearing Amazon's Prime Big Deal Days, which officially run October 6 and 7. But there is no need to wait until the sale begins to start looking. Early offers are already live, and camera gear is one category where I found enough worthwhile discounts to put together a proper creator-focused list.

I’ve deliberately gone wider than interchangeable-lens cameras here. There are pocket and action cameras, a 360 camera, an instant camera, two wireless microphone systems, and a pair of webcams covering very different budgets. Prices were checked on October 2, and as always with Amazon, they can move quickly.

Read more
Digital Trends Readers’ Choice Awards 2026: It’s time to pick your favorite tech brands
This is your opportunity to honor the brands that you trust, and whose products are a part of your daily lives.
Digital Trends Readers' Choice Awards

For years, Digital Trends has engaged millions of tech enthusiasts across the world, who trust us with their daily news brief, hot takes, and useful guides. Most importantly, our reviews section is the pillar of our expertise and helps you make informed decisions about which gadgets to buy and which appliances to skip. Now, it's time for you to pick the brands that have impressed you with product quality, after-sales experience, and basically any other aspect that makes you trust them.

The 2025 edition of Digital Trends Readers' Choice awards picked up some surprising winners, showing us that an innovative new label can easily dethrone an established one if their products wow you consistently, and their services don't leave you hanging in a sea of uncertainty. This year, there are more categories to pick and more brands to vote for. From the best in the PC segment to the sleeper hit in the robot vacuum segment, we need your experience and faith to pick the brands that deserve your hard-earned money and acclaim.

Read more
Camp Snap’s new 110D brings back the charm of 1970s point-and-shoot cameras
Camp Snap 110D feature

Camp Snap has built its reputation on screen-free, point-and-shoot cameras that skip the apps and settings menus in favor of simple, straightforward photography. With the new 110D, the brand goes one step further and channels the exact shape of the classic 110 cameras from decades past.

What makes the 110D stand out?

Read more