Hall Effect Sensors

[last updated: 2022-09-13]
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• US5881LUA
  Adafruit PID:158
  
  • Wide operating voltage range from 3.5 V to 24 V
    Low sensitivity
    CMOS technology
    Chopper-stabilized amplifier stage
    Low current consumption
    Open drain output, 50ma max output current
    Thin SOT23 3L and flat TO-92 3L both RoHS compliant packages
    SE package North pole active
    UA package South pole active
  • Connect a 10K pull-up resistor from pin 3 to power. The UA package is "south-pole active", meaning when the sensor is near the south pole of a magnet, pin 3 (output) goes low. If the south pole is removed, or if a north pole is near, the output will stay at (pull-up) high.

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• US1881 (Latching)
  Sparkfun: COM-09312
  
  • If a magnet is near, the output goes LOW, and latches, ie. Stays low until an opposite magnetic pole is near.
  • However a forum post suggested using Arduino to toggle the power applied to the sensor, as interrupting the power will reset the sensor to un-latched condition.
    There was some discussion suggesting you needed a 10ms delay for reliable reset.

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• AH1815 (Non-Latching)
  Sparkfun: SEN-14709
  
  • 2.5V to 5.5V, consumes 24µW with 3V supply.
  • Connect pull-up from output to +V, 10k - 100k
  • A small capacitor 0.01 to 0.1 uf across +V to gnd will improve noise immunity.
  • Open-drain output switches on (LOW) when triggered with either a north or south pole. When the magnet is removed the output goes off (HIGH from pullup).

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