Understanding U1 Sensor Function
Please explain what @U1 does.
Thought for 27 sec
Component Overview: U1
A Passive Infrared (PIR) motion sensor that detects changes in infrared radiation (i.e., general movement) within its field of view and outputs a digital signal when motion is sensed.
A Passive Infrared (PIR) motion sensor that detects changes in infrared radiation (i.e., general movement) within its field of view and outputs a digital signal when motion is sensed.
Table
| Pin | Function |
|---|---|
| VCC | Power supply input (connect to battery/rail) |
| GND | Ground reference |
| DO | Digital output: HIGH when motion is detected |
Usage in this design:
- Power: U1’s VCC and GND pins power the sensor from the single-cell battery.
- Motion Detection: When U1 senses movement, it asserts the DO pin.
- Drive Action: The DO output is wired to the motor driver (M1) to activate the vibration motor upon motion detection.
Supply current query
Decoupling capacitor selection
Pull-down resistor for DO
Bypass cap placement guide
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