How to Build a Custom DIY Electronic Device to Detect Hidden Cameras in Your Home


Hidden cameras in private spaces are a disturbing privacy violation. As home electronics become increasingly sophisticated, hidden cameras are a real possibility that we must be vigilant against. In this article, I will teach you how to build your own hidden camera detector using common electronic components. With a custom DIY detector, you can sweep for camera lenses and ensure your privacy.

Understanding Hidden Cameras

Before building our detector, let's overview common hidden camera types:

Pinhole Cameras

Wireless Cameras

Infrared Cameras

How Camera Lenses Reflect Light

The key to detecting hidden cameras is understanding how their lenses intrinsically reflect light:

We can exploit this glint to find concealed cameras by shining a bright light over an area and looking for points of reflected light.

Electronic Component Overview

Our project uses simple electronics and common components:

Circuit Diagram

Here is the circuit diagram showing how to connect the components:

I used a TI LM358 Op-Amp and a TEPT5700 Light Sensor, but any similar components will work.

The wiring is straightforward - supply power and ground to the op-amp, connect the sensor output to the inverting input, and take the op-amp output to the buzzer.


Follow these steps to build your detector:

Gather Components

First, acquire the required electronic components:

Solder the Circuit

Next, construct the circuit on a prototyping board according to the diagram.

Mount the Lens

Carefully mount the camera lens in front of the light sensor using tape or glue.

Install in Enclosure

Finally, install the circuitry in an enclosure like a plastic project box.

Using your Hidden Camera Detector

Operating the device is straightforward. Simply sweep the flashlight beam over surfaces while closely observing the lens. Reflected glints will focus onto the light sensor, increasing voltage and triggering the buzzer tone.

To locate hidden cameras:

With consistent scans, you can identify the ambient reflective surfaces in a room and recognize new glints that may indicate hidden cameras. The buzzing provides clear audio cues rather than relying solely on visual recognition.


By leveraging simple electronics, we can build an effective tool to detect hidden cameras based on intrinsic lens reflections. The custom DIY device provides peace of mind and protects our personal privacy. With a discerning eye and systematic scanning, hidden cameras have nowhere left to hide.

This concludes the guide on constructing your own hidden camera detector. Let me know if you have any other questions!