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KittyCam is an open-source Raspberry Pi project that takes a photo when a passive infrared (PIR) sensor detects motion, then uses cat-face detection to decide whether the image shows a cat. It is a motion-triggered photo system—not a continuous video-streaming camera—and its original instructions describe a Raspberry Pi 2-era build.
How KittyCam works
The project combines a Raspberry Pi, camera, PIR motion sensor, and Node.js software. Motion prompts the camera to capture a photograph, and a child process runs KittyDar to look for a cat face. When the image is classified as containing a cat, the app uploads it to Cloudinary. PubNub updates the browser interface, and the project also describes an optional Nexmo SMS containing a link to the image. After analysis, local photos are deleted to limit storage use. The project repository documents this architecture.
That flow is useful to understand before adapting the project: the sensor triggers still-image capture, while software filters those images. It does not continuously analyze or stream video.
What the original build requires
The repository describes a Raspberry Pi 2 with Wi-Fi, a 5MP camera board, a PIR sensor, and three female-to-female wires. The camera connects to the CSI connector. In the documented PIR wiring, VCC connects to 5V, ground to ground, and output to GPIO 4 (physical pin 7). These are historical build details, not a guarantee of compatibility with newer Raspberry Pi boards, cameras, or operating systems. Check the connector and hardware requirements for the specific components you plan to use before wiring them.
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The author’s December 25, 2015 tutorial presents the project as a Raspberry Pi camera with cat-face detection in Node.js. For a current adaptation, the practical hardware checks are:
- Whether the Pi model and memory suit the software workload.
- Whether the camera and board support the same connector and camera stack.
- Whether the PIR sensor’s output is appropriate for the Pi GPIO input.
- Whether the detector works for the lighting and cat poses expected in the room.
- Whether cloud uploads, browser updates, and SMS are still needed.
These are evaluation criteria suggested by the design, not tested comparisons between current components.
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Software and setup caveats
KittyCam is written in Node.js and uses Johnny-Five with Raspi-IO for Raspberry Pi hardware interaction. Its setup notes call for system Cairo and native build dependencies for node-canvas, and include a workaround for an old KittyDar/node-canvas dependency combination. The repository also gives Node.js 4.4.5 ARM installation instructions and says to run the application with elevated privileges. Those commands and versions are historical; they should not be treated as current installation recommendations or evidence that the dependency stack is still supported. Revalidate dependencies and operating-system compatibility before attempting an install.
Cloudinary, PubNub, and Nexmo are part of the described design, so reproducing all the original features also means checking whether those services and their interfaces remain suitable for your needs. The project documentation does not establish current service availability or pricing.
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Limitations reported by the author
The repository describes several shortcomings observed with this implementation, rather than independently measured performance results:
- Capture delay: Setting the capture interval to zero started many image processes and caused the Pi to crash. The author used a one-second interval instead, which added delay.
- Low light: The author reported that the room was too dark after sunset for recognizable images.
- Cat pose and movement: KittyDar missed a cat eating with its head down, as well as cats in some moving or turned-away poses.
The cited project materials provide no validated accuracy, latency, or low-light benchmark figures. Treat the limitations as observations about this build, not as a quantified assessment of every version or adaptation.
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What KittyCam is useful for today
KittyCam is best approached as a historical maker example and an architectural reference: it shows one way to combine a motion sensor, still-image capture, cat-face detection, cloud storage, browser updates, and optional text notifications. The cited sources do not establish that the original dependency versions remain supported today, nor do they guarantee that its instructions will work unchanged on current hardware. Anyone adapting it should verify compatibility and test detection in the intended room conditions.
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