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This story has been updated. It was originally featured in the April 2006 issue of Popular Science magazine and involves outdated technologies and services. For current advice, check our product review team’s selections of the best doorbell cameras and best home security cameras.

Is that guy at my front door delivering the pizza I’ve been dying for, or is it one of those religious proselytizers who won’t take “no” for an answer? With an audio-equipped networked camera, I can sit at the other end of the house and beg the delivery guy to wait—or release the hounds. And if I’m on vacation in Tahiti, I can find an internet connection or cellphone and keep an eye on the babysitter.

  • Project: set up a networked cam
  • Time: 2 hours
  • Cost: $80 and up
  • Difficulty: easy | | | | | hard (Editor’s note: 3/5)

Networked cameras are like webcams, except that they have their own web server built in, so they send video over the internet without a computer. An installation suitable for your front door used to run well over a grand. But now you can get a cam online yourself for as little as $80, while $500 will buy a weatherproof, vandal-proof cam that will pan, tilt, and even zoom by remote control. And as long as you have a router that’s no more than a few years old, setup is typically just plug-and-play. Follow the steps below, and find the best gear for three common scenarios.

Key cam-buying decisions

Networked or closed-circuit?

  • Closed-circuit cams can broadcast a feed only to a TV but can be networked later with a small add-on box (from $180;

Where to record?

  • Get a camera that records to a local PC instead of an external server. Sending a constant video stream out over your internet line will clog your connection.

Is it compatible?

  • Not all cams work with all browsers or portable devices. Axis and Panasonic are known for playing well with others, but always check before you buy.

Mechanical or electronic iris?

  • If your cam is anywhere near direct sunlight, spring for one with an auto-iris lens, which will protect the sensor from burning out.

3 networked camera setups

Front-door cam

  • Cost: $200 to $600
  • Why you’d want it: To see and talk to whomever is ringing the doorbell while you’re somewhere at the other end of the house or sunning yourself in the Bahamas. Most of these cameras can also email you when they spot motion so that you don’t have to spend all your time peering at a browser window.
  • What you need: Get a camera with an enclosure that can stand up to the weather, such as the Panasonic BB-HCM331A (around $600; Or opt for a cheaper model, like the Sony SNC-M1 ($130 on Amazon), and build your own enclosure. To chat with visitors, you’ll want two-way audio, but this means you’ll also need a microphone and speakers on your computer. Ironically, audio isn´t usually available when you’re viewing the cam’s feed from your cellphone.

Indoor cam

  • Cost: $80 to $300
  • Why you’d want it: To see if the dog is eating your shoes while you’re at work, if the baby is awake, or if the neighbor kid really is watering the plants.
  • What you need: Since these cameras will be indoors and stationary, you can get by with a much cheaper unit, but unless you want it to be an obvious part of your decor, go for something small and subtle. The Gadspot NC800 is a mere $80 and includes an infrared illuminator for watching what happens in the dark.

Vacation-home cam

  • Cost: $300 to $1,200
  • Why you’d want it: To keep an eye on the cabin between visits.
  • What you need: To watch an entire property, look for a model, such as the Panasonic mentioned above, that allows you to network several cams and to view and control them all from one interface. Or go for a single cam with pan, tilt, and zoom capabilities, such as Vivotek’s PZ6112 ($650; Some people even point a single cheap stationary cam at their thermostat to make sure the furnace hasn’t quit.

How to set up your networked cam

1. Power up the camera and plug in an Ethernet cable from your router. If it’s a wireless model, use the installation program to enter your network details.

2. Configure your camera’s settings. Unless you have a very fast internet connection, choose a low resolution and frame rate, and don’t forget to set a password.

3. If your router is more than a few years old, find its manual. You’ll probably have to adjust some of its advanced settings to get your cam on the internet.

4. Aim the camera. If it’s outdoors, keep direct or reflected sunlight out of the camera’s field of view or get a lens with an automatic mechanical iris.

5. If your netcam offers a service that lets you create your own web address to tune into your feed (instead of typing in an IP address), sign up for it.

DIY options

  • Buy an indoor cam and build your own weatherproof case using a Plexiglas window, or a bubble if your cam can pan and tilt (try your local hardware store for supplies), or buy a pre-made enclosure ($100 and up;
  • Ditch the extension cord and deliver power to your camera over its Ethernet cable. Click here for instructions.