Deploying a camera without reliable power means battery life is the constraint everything else works around. The problem isn't capacity — it's that most cameras stay fully awake even when there's nothing happening, burning through charge on empty frames.
PIR triggering changes that equation. The camera stays in deep sleep at 6.1 μA until the sensor detects motion. Then it wakes up, captures, runs YOLOv8 Nano inference on-device, pushes via MQTT, and goes back to sleep — the whole cycle takes a few seconds. For entry points, construction sites, remote monitoring — anywhere events are infrequent — this makes a real difference.
Our solution
Hardware
- NE301 — firmware FSBL ≥ 1.0.3
- PIR sensor NP624M-F — 5 μA draw, RF interference resistant, 1.6–3.6V supply
- MQTT Broker + NeoMind account
Connection 4-pin PIR header on the NE301 mainboard. Face the sensor toward the detection zone. Keep away from heat sources and AC vents — thermal noise causes false triggers. Indoor mounting height: 2–2.5 m.
The NE301 supports both battery and external power
PIR parameters
| Parameter | Recommended | Note |
|---|---|---|
| IO Trigger-PIR | On | — |
| Usage | Rising Edge | Triggers on motion start |
| Sensitivity | 30–40 | Lower = more sensitive |
| Ignore Time | 7 (~4 s) | Raise for low-traffic sites |
| Pulse Count | 2 | Noise filtering |
The one worth adjusting for your site is Ignore Time — higher values prevent a single event generating a burst of captures, which quietly drains battery in low-traffic deployments.
Data pipeline NE301 pushes captured images to your MQTT Broker after each trigger. NeoMind subscribes to the topic, auto-discovers the device, and surfaces a dashboard with event timeline and image previews. Open source — self-hostable.
Power numbers
WiFi mode, 4× AA alkaline (1750 mAh effective capacity):
| Captures/day | Daily draw | Battery life |
|---|---|---|
| 1× | 0.36 mAh | 13.3 years |
| 3× | 0.79 mAh | 6.1 years |
| 5× | 1.22 mAh | 3.9 years |
| 10× | 2.29 mAh | 2.1 years |
At 1×/day, standby accounts for 42% of daily draw — which is why the 6.1 μA sleep floor matters more than it looks. No WiFi on site? Cat-1 mode still gets you ~8.4 years at 1×/day.
Cold weather note: alkaline AA batteries lose 20–30% capacity at 0–10°C, up to 60% below -10°C. Figures above are 25°C baseline.
Limitations worth knowing
PIR works on thermal contrast — sensitivity drops when targets are close to ambient temperature. It's also event-based, not suited for continuous streaming. NE301 also supports radar triggering if you need through-wall detection or temperature-independent sensitivity.
Full setup guide, wiring diagrams, MQTT config, and battery life calculator → wiki.camthink.ai/docs/neoeyes-ne301-series/application-guide/pir-sensor-integration
What trigger mechanism are you using for battery-powered cameras? Anyone combined PIR with radar on the same unit — curious about false positive rates outdoors.