Cat watcher
A snapshot from the camera board every time the PIR sees the cat move, on USB power. About $41 in parts.
Parts
- Freenove ESP32-S3-WROOM CAM (N16R8, 16 MB flash / 8 MB PSRAM, GC0308) C-002$21.95
- PIR Motion Sensor (BISS0001 module, Adafruit 189 / HC-SR501 class) L-003$9.95
- USB-C 5.1 V 3 A Power Supply E-005$8.74
Parts $40.64 · powered by the USB-C 5.1 V 3 A Power Supply
Wiring
The volts are the parts' own: the USB-C 5.1 V 3 A Power Supply puts out 4.845–5.355 V, and the Freenove ESP32-S3-WROOM CAM (N16R8, 16 MB flash / 8 MB PSRAM, GC0308)'s regulator makes the 3.2–3.4 V rail its GPIO and most of the sensors run from. Which header pin each lead lands on is our suggestion — the registry has no pin map, and nothing here has been wired on a bench.
Power the board off while you plug anything in. Every connector here is keyed: if it doesn't click in easily, turn it over rather than forcing it.
Readings
What this build sends: one column per channel its parts read or drive, with the unit the capability carries. The values and times below are sample data.
| Time | MotionL-003 | SnapshotC-002 |
|---|---|---|
| clear | — | |
| MOTION | cat-0412.jpg | |
| clear | — | |
| clear | — | |
| MOTION | cat-0413.jpg | |
| clear | — |