To turn an old Android phone into a motion detection camera, pair it with AndrIoT, open the phone in the dashboard, draw one or more motion zones over the areas you care about, and switch on alerts. When something moves inside a zone you get a push notification with the time and a clip if recording is on.
The hard part is not turning it on, it is stopping false alarms. This guide covers placement, zone shapes, sensitivity, and the extra alarms (tripwire, tamper, siren) that make a phone camera more useful than plain motion alerts.
Key takeaways
- Motion detection fires when pixels change inside a zone you draw. It does not recognise people, pets or cars.
- Small, well-placed zones beat one big zone: they avoid trees, shadows and screens.
- Tamper and tripwire arm set off an alarm if the phone itself is moved.
- Alerts go to push notifications and, through the Forwarding Hub, to Telegram, webhook or MQTT.
- Test your zones in daylight and at night, then adjust after the first 24 hours.
How motion detection works on a phone camera
The app watches the video and compares frames. If enough pixels inside a zone change, it counts as motion. That is a simple and fast method that works on old hardware. It does not know what moved. A person, a pet, a curtain, a car headlight sweeping a wall and a flickering TV all count the same.
This is the main reason to use zones. A zone limits detection to one area, and anything outside it is ignored.
Step-by-step: set up motion alerts
- Pair the phone and place it. If you have not done this yet, follow the security camera setup guide.
- Open the phone in the dashboard and go to the motion detection controls.
- Draw a zone over the area you want to watch, such as the door, a gate or a cabinet. Keep it as small as possible.
- Set sensitivity. Start in the middle. If you get alerts from shadows, lower it. If you miss movement, raise it.
- Turn on alerts and choose push notifications. Optionally add Telegram, webhook or MQTT in the Forwarding Hub.
- Turn on recording if you want a clip with each alert. Clips are stored for your plan retention (7 days on Standard, 30 days on Pro).
- Walk through the zone to test, then check the activity log to confirm the event appeared.
Cutting down false alarms
Most complaints about motion cameras are about false alarms. These are the usual causes and fixes.
| Cause | What you see | Fix |
|---|---|---|
| Sunlight through a window | Alerts at the same time each day | Leave windows out of zones; close blinds |
| Passing car headlights | Alerts at night | Aim away from windows; use a smaller zone |
| Ceiling fan or curtain | Constant alerts | Exclude it from the zone |
| TV or monitor | Flicker alerts | Exclude the screen |
| Wi-Fi drops and reconnects | Gaps in the log | Check signal; see the power guide |
| Auto exposure shifting | Alerts at dusk and dawn | Lower sensitivity |
Change one thing at a time and give each change a day before judging it.
Beyond motion: tripwire, tamper and siren
Because the camera is a phone, it can notice if someone moves or unplugs it. This is useful where a thief could take the camera first.
- Tripwire and tamper arm: arm the phone and it raises an alarm if the phone is picked up or moved.
- Power-outage alarm: the dashboard tells you when the phone stops charging, which often means the power is out or the cable has been pulled.
- Siren: sound a loud alarm from the phone, manually or as a response.
- Text-to-speech: have the phone say a message, for example a warning that the area is being recorded.
These work best together with a visible sign that cameras are in use. See the legal notes for shops and rentals.
A tuning routine for the first week
Good motion detection comes from a few rounds of small changes, not one perfect setup. This routine works for most rooms.
- Day 1, evening. Set one small zone, medium sensitivity, push alerts on. Do nothing else.
- Day 2, morning. Open the activity log. Count the alerts and note the times. Alerts at the same time every day point to sunlight or a schedule, such as a heating fan.
- Day 2, evening. Shrink or move any zone that caused repeat false alerts. Lower sensitivity one notch if needed.
- Day 3. Walk through the zone on purpose at a normal pace and again slowly. Confirm that both trigger an alert. If the slow walk does not, raise sensitivity a notch.
- Day 7. Add a second zone only if you still have a blind spot. Keep each zone to one purpose.
A common mistake is raising sensitivity to catch everything and then drowning in alerts. An alert you learn to ignore is worse than no alert, so aim for few alerts that always mean something.
Placement tips specific to motion detection
- Mount the phone so people walk across the frame rather than straight towards the lens. Sideways motion changes more pixels.
- Keep the phone still. A wobbling stand makes the whole picture move and looks like motion. A clamp or a shelf with a lip works better than a loose stand.
- Avoid pointing at a reflective floor or glass table, which doubles every movement.
- For a door, put the zone just inside the door, not on the doorway itself, so you get a moment of warning before the person reaches the camera.
- Keep the lens clean. A smudge makes bright lights bloom at night and triggers extra alerts.
Motion detection at night
Without infrared, a dark room gives the app almost nothing to compare. Add a small night light, or place the phone where a street light or hallway light reaches the zone. Do not rely on the phone flashlight for long periods because it heats the phone. Check the alert path at night, not just in the day.
Where alerts can go
Push notifications are the default. For people who want alerts in a chat or in another system, the Forwarding Hub can send them on.
| Destination | Plan | Good for |
|---|---|---|
| Push notification | All | Quick alert on your phone |
| Telegram bot | Standard and Pro | Alerts in a chat you already use |
| Webhook | Pro | Your own server or automation |
| MQTT | Pro | Home automation systems |
The alerts guide shows how to set each up.
Pros and limits
Pros
- Zones keep alerts focused on the places that matter.
- Tamper, tripwire and power-outage alarms protect the camera itself.
- Alerts reach push, Telegram, webhook or MQTT.
- No hardware beyond the phone.
Limits
- It detects movement, not people, pets or vehicles.
- Needs light: no infrared night vision.
- Sunlight, shadows and screens cause false alarms until you tune it.
- Depends on the phone staying powered and online.
FAQ
Can the app tell a person from a pet?
No. Motion detection reacts to pixel changes inside a zone. It does not classify what moved. Use small zones to limit what can trigger it.
How do I stop false alerts?
Draw smaller zones, leave out windows, fans and screens, lower the sensitivity, and test again after a day. Shadows and headlights are the most common causes.
Will I get a video clip with the alert?
If recording is on, the event is saved as a clip for your plan retention period. Without recording you still get the alert and an activity log entry.
Can I get alerts on Telegram?
Yes, on Standard and Pro through the Forwarding Hub. Webhook and MQTT are on Pro.
What if someone takes the phone?
Arm the tripwire and tamper alarm so that moving the phone raises an alert, and watch for the power-outage alarm if the cable is pulled.