← Sensors 🛒 WHAT TO BUY plug-and-play picks, no building

Just want to buy it and set it up?

Concrete picks for people who don't want to build anything — buy the box, plug it in, follow the setup guide. One pick per job, plus the honest runner-up.

Read this first. These are representative, well-known options as of mid-2026 in the US. Models, prices and stock change constantly and these are not affiliate links — check current reviews and availability before you buy. Prices are rough.
🌐 In a browser? 📡 Radar 📷 Cameras ✈️ Planes 🛸 Drones 📻 Radio 🔌 Extras

🌐 Does it work in just a browser?

Mostly yes. Chrome and Edge (on a computer or Android) can talk to hardware directly — the camera, a detector over Serial or Bluetooth, an ESP32 over Serial — so no scripts. Here's the honest picture and the easy way around each gap.

📷 Cameras / platesfull browser

The browser opens your webcam or phone camera directly. Already works — the camera setup and drive mode use it.

📡 Radarbrowser

Pair the detector and connect it at the browser link — Serial covers detectors paired as a COM port (most of them), Bluetooth LE covers the app-based ones.

🛸 Dronesbrowser via ESP32

The browser reads the ESP32 Remote ID board over Serial. A phone app can also just show drones with no hardware.

✈️ PlanesPi is easier

Decoding 1090 MHz in a browser is possible (WebUSB) but heavy; a Raspberry Pi running the receiver is the easy path, then it feeds the map.

📻 Police radionot in a browser

P25 decoding is too heavy for a browser and needs a Pi. The easy in-browser substitute is just listening to a Broadcastify feed (audio, not a map dot).

The two real gaps, and the easy fix for each:
1. iPhone / Safari blocks browser‑to‑hardware entirely. Easy fix: use Chrome on a computer or an Android phone, or run the tiny PC bridge. A native app would close this later.
2. Police radio can't decode in a browser. Easy fix: run it on a $40 SDR + Raspberry Pi, or just link a Broadcastify feed to listen.

📡 Radar detectors easy

Feeds the live speed-trap layer. The easiest to set up are the ones with a Bluetooth app, because they pair straight to your phone or PC through the browser link — no script.

Best for easy setup
Cobra RAD 480i / 700i~$150–250

BLE app, so it pairs to Chrome on your phone or desktop through the browser link with no software. Range and false-alert filtering aren't as good as Uniden, but for a fixed node (a detector on your desk near the road) that barely matters. This is the plug-and-play pick.

Best detection
Uniden R7 / R8 (or R4 to save)~$300–700

The best range and the fewest false alerts. If its app uses classic Bluetooth rather than BLE, connect it through the small PC bridge (radar_bridge.py) instead of the browser. Overkill for a fixed desk node; worth it in a car.

Skip: anything under ~$40, and any "24 GHz radar module" (HB100/CDM324) — those detect motion, not police radar, and can't hear Ka at all. Ka (33–35 GHz) is the band that matters.

📷 Cameras / plate readers

Reads government & marked plates. There are three real choices; which one depends on where you're mounting it.

1. Dedicated LPR/ANPR IP camera best for plates

Amcrest / Dahua ANPR (LPR) camera~$200–400

Purpose-built to read plates, including at night — it has a fast shutter and controlled IR so a retroreflective plate doesn't blow out. PoE + RTSP, mounts outside, feeds in through Add an IP camera. If night plates matter, this is the one.

A note on Hikvision: excellent LPR cameras, but banned for US federal use (NDAA) and a common privacy concern. Amcrest (a Dahua OEM) or other brands avoid that.

2. General IP camera with IR night vision good value

Reolink RLC-811A~$100–130

4K, weatherproof, PoE (one cable), and — the reason to pick it — 5X optical zoom. Aim it once at your stretch of road and zoom until a lane fills the frame, so the plate is physically large in the image (that helps the full‑res crop as much as any software). Confirmed RTSP/ONVIF, feeds via Add an IP camera. Plain IR can bloom on a plate at night, so it's a daytime‑first pick.

Reolink RLC-823A / 823S1 (PTZ + zoom)~$180–220

4K PoE with 5X optical zoom and auto‑tracking, RTSP/ONVIF. Good for an intersection — but the auto‑track can wander off the lane you want, so for a fixed road node the steady RLC‑811A above is better.

⚠️ Wired PoE only. The battery/4G versions of these (Go, Argus, TrackMix LTE) drop RTSP and can't feed the map — see the box above. Confirmed against Reolink's own RTSP/ONVIF support list: wired RLC cameras support it, battery/LTE do not.

3. USB webcam — the desk / window pick cheapest

Logitech Brio 4K (or any 1080p webcam)~$40–150

If your PC sits near a road-facing window (a lot of people, maybe you), point a webcam out the glass and run the camera setup. No PoE, no network camera — just USB. Daytime plates are fine; night needs a streetlight. This is the simplest possible start with hardware you may already own.

⚠️ The battery / LTE camera trap. Battery or 4G cameras (Reolink Go, Argus, TrackMix LTE, most "solar cams") almost always drop RTSP and ONVIF to save power and are app/cloud‑only — so there's no way to feed their video to SparrowMap. Even wired‑LTE models lose RTSP over the cellular link. Their telephoto zoom and go‑anywhere power are exactly what a good node wants, but the locked stream makes them unusable here. For a wireless spot, use a wired/PoE or Wi‑Fi camera that supports RTSP + a small LTE travel router, or the Pi node.
IR vs non-IR, in one line: IR = night vision, but ordinary IR cameras often can't read a plate at night (it reflects back too bright) — for night plates get a true LPR camera with a proper shutter. Non-IR is simpler and fine for daytime or well-lit streets.
IP camera vs webcam: an IP camera is weatherproof, mounts outside and streams over the network (best for a real road node); a webcam is cheap and indoor, needs a PC beside it (best for a window/desk node).

✈️ Planes / police aircraft easy

FlightAware Pro Stick Plus + 1090 MHz antenna~$85 total

Plug the stick into a Raspberry Pi, flash the PiAware image, connect the antenna. Done — it receives aircraft on 1090 MHz, including police helicopters, and flags orbits. Add the adsb_feed.py feeder to put your coverage on the map.

Even simpler
Prebuilt ADS-B receiver kit~$100–170

A ready box with the SDR, filter and antenna bundled if you'd rather not source parts. Same result.

🛸 Drones (Remote ID) app is instant

No hardware at all
"Drone Scanner" / OpenDroneID phone appfree

Install it and your phone shows drones broadcasting Remote ID nearby — and often the operator's location — using the phone's own Bluetooth/Wi‑Fi. Instant, no hardware. (To auto‑feed the map, you still pair the app or a board to the drone feeder; on its own it just shows you.)

Buyable board for the map
Pre-flashed ESP32 Remote ID scanner~$20–40

Sold ready-flashed by hobby sellers (no flashing needed). Plug into a Pi or PC over USB and run drone_feed.py to put drones on the map.

📻 Police radio not plug-and-play yet

Honest heads-up: radio is the one capability that is not truly buy-and-go for the map. Decoding P25 needs an RTL-SDR plus trunk-recorder, which takes real configuration — and many departments now encrypt, so check your county first.
For the map (some setup)
RTL-SDR Blog V4 kit + a Raspberry Pi~$40 + Pi

Run trunk-recorder, then p25_feed.py posts "radio active here." Worth it only if your county is unencrypted.

Just to listen (not the map)
Uniden SDS100/SDS200, or a Broadcastify feed$0–700

A digital scanner is turnkey for listening; a Broadcastify feed needs no hardware at all. Neither feeds the map by itself yet.

🔌 Extras for a portable / wireless node

Raspberry Pi 5 (4 GB) + case, PSU, SD~$95

The little computer that runs the camera, planes, or radio feeder.

USB GPS receiver~$15

Lets a node know where it is — so it works anywhere with no setup.

4G/LTE hat + 18650 battery + small solar panel~$70

Cuts the last cords: wireless data and no wall power. Drop it anywhere.

Then what? Every one of these is walked through step by step on the setup page. Radar pairs at the browser link; cameras go through Add an IP camera or the webcam setup. Want to build instead of buy? That's /sensors.

Every device here is receive-only, and only government/marked vehicles are ever published — a private vehicle's plate is removed on the device before anything is uploaded. Recommendations are representative, not verified-live; confirm current models and prices yourself.