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I have make a remote control car
Product worked well for my Linux pc, no drivers needed, simple installation.
Hall Effect Sensor Module
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Hall Effect Sensor Module is used to detect the proximity of a magnet. It is very much smaller in size. When the magnetic field rises above a threshold level, the open-collector output transistor switches on, which pulls the logic-compatible output low and illuminates the onboard LED indicator.
It's fast (The turn-on threshold is 35-450 Gauss, the minimum hysteresis is 20 Gauss, and the operating voltage range is 4.5 - 24 volts. This module uses the Allegro MicroSystems A3144EUA sensor. It has a 3-pin interface, signal, V+, and GND.
To use this sensor/switch, place a 10K pull-up resistor between the "S" pin and the middle pin (+), and connect the "-" pin to the ground. Supply voltage to the middle pin. The "S" pin will go low (gets pulled to the ground) and the onboard LED indicator will turn on when a magnet is brought near.
| Sensor Type | Hall Effect Sensor Module | 
| Power | 2.3V ~ 5.3V | 
| Mounting holes size | 2mm | 
| Dimensions | 29.2mm * 11.2mm | 
| Weight | 5 grams |