AM312 mini PIR
Also known as: AS312 · mini PIR 3.3V · Presence & motion
The PIR that fits *inside* things — it's what the Apollo and Everything Presence multisensors embed. 3.3 V native, thumbnail-sized, no potentiometers to knock.
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At a glance
⚑ flag an error| Measures | motion |
|---|---|
| Accuracy | Tiny 3.3 V PIR, fixed timing, shorter range than HC-SR501 |
| Interface | GPIO |
| Supply | 2.7–12 V |
| Battery-viable | Yes (deep-sleep friendly) |
| ESPHome | Generic ESPHome component (adc/gpio) — binary_sensor (gpio) |
| Typical price | $1-2 (street, varies) |
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Clone check
Medium clone risk. Sensitivity varies wildly between clone batches; test before committing a design.
Good for
Gotchas to know
- Less sensitive and shorter-range than an HC-SR501 — fine indoors at room scale.
- Fixed ~2 s output timing; do retrigger logic in ESPHome.
Wiring it up
Simple wiring: one data GPIO on any ESP32 dev board.