| Price | $3 |
|---|---|
| Category | Sensors |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
An A3144 Hall-effect switch on a 4-pin carrier with an LM393 comparator, a sensitivity trim pot and two LEDs. Bring a magnet near it and D0 flips cleanly - no contact, no bounce, no wear - which makes it the standard way to count wheel revolutions or build a magnetic door switch. It is a switch, not a field meter, and it is unipolar: if nothing happens, flip the magnet over.
Key features
- Contactless magnet detection, clean digital output
- Unipolar - triggers on one magnet pole only, so flip it if nothing happens
- LM393 comparator with sensitivity trim pot
- Power and signal LEDs on board
- 4 pins: VCC, GND, D0, A0
- For RPM counting, end stops and magnetic door switches
Details
Specifications
| Chipset | A3144 Hall-effect switch + LM393 comparator |
|---|---|
| Form | 4-pin breakout module (VCC, GND, D0, A0) |
| Type | Unipolar Hall-effect switch (on/off, not a linear field sensor) |
| Operating voltage | 5V DC (A3144 itself will take 4.5-24V) |
| Output | Digital threshold (D0); A0 follows the sensor pin |
| Sensor output stage | Open collector, sinks up to 25 mA |
| Adjustment | Onboard 10k potentiometer sets the comparator threshold |
| Indicators | Power LED + output LED |
| Dimensions | ~27 x 14 mm |
