11 Mar 2026 — Supply voltage: 4.5V to 20V DC. Output voltage: 3.3V HIGH / 0V LOW (compatible with 3.3V and 5V microcontrollers) Detection range: Go to product viewer dialog for this item. PIR Motion Sensor HC-SR501
The output is active‑high and can be connected directly to the digital input pins of an Arduino, ESP32, Raspberry Pi, or similar microcontroller. hw416b pir sensor datasheet better
If your sensor false-triggers from power supply noise (e.g., when an AC motor turns on nearby): 11 Mar 2026 — Supply voltage: 4