Comparison page

PIR HC-SR501 vs ACS712

Side-by-side selection notes for specs, ecosystem readiness, known issues, and data confidence. This page is generated from structured component fields instead of a hand-written article.

PIR HC-SR501

Projects needing Motion and PIR with a commonly available sensors part.

ACS712

Projects needing Current and Hall effect with a commonly available sensors part.

Specification Matrix

DimensionPIR HC-SR501 ACS712

CategorySensorsSensors

MakerGenericAllegro MicroSystems

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesArduino, MicroPythonArduino

Price$0.80 - $3.00$1.00 - $3.00

Known Tradeoffs

PIR HC-SR501

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

ACS712

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

Open Individual Model Pages

PIR HC-SR501

Generic

Passive infrared motion sensor module used in smart lighting and occupancy detection projects.

China-madeSensors72% confidence

ACS712

Allegro MicroSystems

Hall-effect current sensor module used for AC/DC current measurement projects.

China-madeSensors76% confidence