CCTV Alarm System: How Cameras and a Burglar Alarm Work Together

A cctv alarm system works best when each part does the job it is good at: the intruder alarm detects that a door, window or room has been entered, and the cameras show you what actually happened so you can decide whether it is real. A camera's own motion alarm and siren can cover some of the alarm's job, especially outdoors, but it is not a full replacement for door contacts and indoor sensors. The practical goal is simple: one clear alert when something is wrong, with video to confirm it, instead of two apps shouting at you about the same cat.

What each part is good at

A traditional intruder alarm is built around sensors that answer a yes-or-no question:

• Door and window contacts report the moment something opens. They do not care about lighting, rain or shadows.
• Indoor motion sensors watch rooms and hallways when the system is armed and nobody should be inside.
• A keypad, fob or app arms and disarms the system, so it knows when you are home.
• A loud siren, and on some systems a monitoring service or automatic calls to a list of contacts.

What an alarm usually cannot do is show you why it went off. A trigger at night could be a burglar, a door that was not latched, or a pet that got into the wrong room.

Cameras answer a different question: what is happening, and who is it? They give you:

• Live view from your phone, so you can look before you react.
• Recorded clips to play back after an event, on a memory card or in cloud storage depending on your model and plan.
• Outdoor coverage of gates, driveways and yards, where alarm sensors are rarely fitted.
• Deterrence through a visible camera, and on many models a warning light, siren or voice message.

The weak spot is that camera detection is based on what the camera sees (or, on battery models, on body heat). It misses things outside its view, and it can be fooled by rain, headlights and moving branches. If you want the details, see how motion detection decides what counts as movement and how PIR sensing works and where it fails.

Put simply: the alarm detects, the cameras verify.

Can a camera's own alarm replace a burglar alarm?

Many Yoosee cameras include motion alerts, and some models add a siren, a flashing warning light or a recorded voice warning. That is useful, but check what it really covers before you rely on it alone.

What a camera alarm can reasonably do:

• Alert your phone when a person enters a gate, driveway, yard or shop floor in its view.
• Sound a siren or flash a light to make a casual intruder move on. We cover that setup in linking the siren and light to motion detection.
• Record a clip of the event so you have evidence afterwards.

What it usually cannot do:

• Know when a door or window opens out of its view, or one it cannot see clearly at night.
• Cover every room. Each camera only watches one area. An alarm sensor in a back room or hallway is usually cheaper and simpler than another camera.
• Arm and disarm automatically with your household on every model. Some app versions offer schedules or an away mode, but menu names and options vary by model and app version.
• Keep working if the Wi-Fi or power goes down. Many dedicated alarm panels have a backup battery and other ways to send alerts. A plug-in camera that loses power stops recording until power returns.
• Reach a monitoring service. If you want someone else to respond while you sleep or travel, that is normally a feature of the alarm side, not of a home camera app.

So for a small flat, a shop with one entrance, or an outdoor area, cameras with alerts and a siren may be enough. For a house with several entry points, a home alarm system with cameras is usually the more complete answer.

Step 1: Map what you are protecting

Walk around the property with a piece of paper and list three things:

1. Entry points — every external door, ground floor window, garage door and side gate.
2. Approach routes — the path someone would walk to reach those entry points: driveway, back alley, garden, stairwell.
3. Valuables and inside routes — the hallway or room anyone would have to cross to reach the main living areas.

Now assign each item:

• Entry points → alarm contacts. These are the most reliable "something just opened" signal.
• Approach routes → cameras. This is where video gives you the most: you see someone before they reach the door.
• Inside routes → an alarm motion sensor, a camera, or both. An indoor camera here lets you check a trigger without going downstairs.

The aim is overlap where it matters: if a door contact triggers, at least one camera should show that door or the approach to it.

Step 2: Place the cameras so they confirm alarm zones

For each alarm zone, ask: "If this sensor goes off at 3 a.m., which camera will I open first?" If there is no good answer, move or add a camera.

Practical placement checks:

• Point a camera at each main entrance from a little distance, so you see a face and the door itself, not just the top of a head.
• Cover the approach, not only the door. A view down the path tells you whether someone is arriving or just walking past.
• Check the view at night. Open the live view after dark. If the area turns black, fix that before you rely on it.
• Avoid pointing cameras straight at streetlights, car headlights or busy roads, which create false motion alerts.
• Keep the camera out of easy reach, so it cannot simply be pushed aside.

If any of this means drilling, running new cables or working on a ladder, switch off power at the circuit first, use a stable ladder with someone holding it, and use a qualified electrician for any new wiring or mains connections.

Step 3: Decide who sends which alert

This is where most setups go wrong. If both the alarm and every camera send phone alerts for every movement, you end up with a flood of notifications and start ignoring all of them.

A simple rule works for most homes and small shops:

• The alarm sends the urgent alert for doors, windows and indoor sensors while armed.
• Outdoor cameras send alerts only for people in tight zones, such as the gate or the front step, and only at the hours you care about.
• Indoor cameras record but do not alert while you are home. If your app version has a schedule or away mode, use it to enable indoor alerts only when the house is empty.

In the Yoosee app, alert and motion settings are usually under the camera's settings, in an area named something like alarm settings or motion detection. The exact names may differ slightly by app version and model. If alerts are not reaching your phone at all, work through why Yoosee notifications stop arriving before changing anything else.

Step 4: Tune camera detection so it supports the alarm

The cameras' job here is to confirm, not to raise endless alarms. Work through these settings one at a time:

1. Draw the detection zone around paths and doorways only. Leave out trees, the road and the sky.
2. Lower sensitivity one step at a time, and test after each change.
3. Turn on human detection if your model has it. Where available, it often removes many alerts caused by animals, shadows and moving plants.
4. Set a schedule so outdoor alerts and any siren are active at night or when you are away.
5. Make sure clips start early enough to show the person arriving, not just leaving.

A worked example of how the split looks in practice: in a two-storey house with a front door, a back door and a side gate, the alarm might have contacts on both doors and one motion sensor in the downstairs hallway. One camera covers the front path and door, one covers the side gate and back garden, and an indoor camera covers the hallway. Only the alarm and the two outdoor cameras send night alerts; the indoor camera simply records. Your own layout will be different, but the logic is the same.

Step 5: Decide what the sirens do

You may now have two sirens: the alarm's and the camera's. Decide on purpose what each one is for.

• The camera siren or light as an early warning outside. A flashing light when someone enters the yard at night tells them they have been seen, before they ever touch a door.
• The alarm siren as the main event, when an armed door or window actually opens.

Avoid setting the outdoor camera siren to sound for every motion. Passing animals, rain and headlights will set it off, which annoys neighbours and trains everyone to ignore it. Light-only at the edge and full siren at the entry point is often a good balance. Check local rules on outdoor sirens, as some areas limit how long or how loud they may sound.

Step 6: Test the whole chain

Do this once after setup, and again every few months or after any app or firmware update:

1. Arm the alarm in the mode you normally use at night or when away.
2. Walk the route an intruder would take, from the gate to the door.
3. Check your phone. You should get a camera alert as you approach (if you set one up), then an alarm alert when you open the door.
4. Open the camera live view straight from the alert. Confirm you can see the door clearly within a few seconds.
5. Play back the recording. Check that the clip shows you arriving, not just the back of your head leaving.
6. Check every phone in the household that should get alerts, not just yours.
7. Disarm and note anything missing: no alert, late alert, dark picture, clip starting too late.

Fix one issue at a time and test again.

Reading the symptoms

• The alarm went off but the camera shows nothing. The camera does not cover that zone, it was offline, or the clip started too late. Check its view and its online status in the app.
• Cameras alert constantly but the alarm stays quiet. Camera detection is too broad. Tighten the zone, lower sensitivity, turn on human detection.
• Two alerts for every event. Both systems are sending alerts for the same area. Pick one to alert and let the other just record.
• Alerts arrive late or in bursts. Usually phone battery saving or a weak Wi-Fi signal at the camera.
• Night clips are black or blurred. The area is beyond the camera's night range, or the lens is reflecting light from a nearby surface.

When to get help

Contact the seller or a professional installer if:

• You need door or window sensors, or a monitoring service, and you are not sure what to buy.
• New cameras or sensors need mains wiring or cables through walls or roofs. Use a qualified electrician for that work.
• A camera keeps going offline even with a good Wi-Fi signal nearby.
• You need to cover a larger site, several buildings, or a business where insurance or local rules may set extra requirements.

For questions about what a specific Yoosee model supports (siren, light, human detection, schedules), check the manual or label for your model, or ask the seller.

Install or resell cameras?

If you fit cameras for customers, ask early whether they already have an intruder alarm, and plan the cameras around its zones rather than separately. Mark each alarm zone on the survey sketch and show which camera confirms it. Agree with the customer who receives which alert, so they are not flooded on day one. Finish with a walk-through test where they open a door while watching their own phone. Partner and distribution details for the Yoosee range are at business.yoosee.com.

Frequently asked questions

Do I need both an alarm and CCTV, or is one enough?

It depends on how many ways in there are. One entrance you can see clearly can often be covered by cameras alone; every extra door or window that no camera sees is a gap that an alarm contact closes more cheaply than another camera.

Can a Yoosee camera connect directly to my existing burglar alarm?

On most home models the camera and the alarm run as separate systems, each with its own app or keypad. Some cameras have extra alarm inputs or outputs, but this varies by model, so check the manual or ask the seller before planning around it. Running them side by side, with the split described above, works without any direct link.

Will the cameras still record if the alarm is disarmed?

Yes. Arming or disarming a separate alarm does not change the camera's recording, which follows the camera's own settings. If you use motion recording, the camera records when it detects movement regardless of the alarm state.

What happens to the cameras if the power or internet goes off?

A camera without power stops recording until power returns. If only the internet drops, a camera with a memory card fitted can usually keep recording locally, but it cannot send alerts or live view until the connection is back. A small backup power supply for the router (and for plug-in cameras, if suitable for them) can help through short cuts; check the power rating before buying one.

Should indoor cameras send alerts when I am at home?

Usually not. Indoor alerts while the family is moving around quickly become noise. Use a schedule or away mode if your app version offers one, or turn indoor alerts off and let those cameras simply record.