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…
Sigma FP2 is the world’s smallest full-frame camera built for photographers and filmmakers
The new mirrorless camera combines 24.5MP photography, 6K OpenGate recording, and expandable accessories in a compact body.
Sigma FP2 featured

Full-frame cameras tend to be chunky beasts, but Sigma wants to prove that big imaging doesn't need a big body. Enter the Sigma FP2, the successor to its tiny, boxy fp mirrorless camera. It keeps the same modular design but packs in some serious upgrades, including a 24.5-megapixel partially stacked full-frame sensor, improved autofocus, 6K video recording, and 70GB of built-in storage. Sigma calls it the world's smallest full-frame camera, and while it might be tiny, the same cannot be said for its price tag.

Sigma FP2 brings faster shooting and 6K video

Read more
This award-winning phone thermal camera is 10% off for Halloween, saving you $107
Thermal Master P3 thermal camera drops with code THERMCAM10 (save $107 total): 512x384 IR super resolution, an adjustable-focus lens, and 2026 Tom’s Guide AI Award winner.
Man using thermal camera attachment with phone

A phone thermal camera is one of those tools you don’t think you need until the first time it saves you from an expensive problem, and the Thermal Master P3 just got easier to try. For Halloween, it’s discounted with the code THERMCAM10, a 10% cut that works out to $107 off the total. It’s also fresh off a win at the 2026 Tom’s Guide AI Awards for best phone thermal camera, which is the kind of third-party nod that separates a serious tool from the cheap clip-on sensors that flood this category.

Thermal Master Halloween sale

Read more
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