Understanding U1 Sensor Function

mecabot123

mecabot123

Please explain what @U1 does.
261 days

flux

0:27

Project
BOM
Schematic
U1

Using Schematic Tool.

Using BOM Tool.

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.

Table

PinFunction
VCCPower supply input (connect to battery/rail)
GNDGround reference
DODigital 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
261 days

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1
BT1
U1
R1
Resistance
220 Ω
D1
M1
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Cat deterent/motion activated vibration motor thumbnail
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