requirements.txt - Python dependencies required for this chapter
hc-sr04.py - Distance Measurement with the HC-SR04 Ultrasonic Sensor
hc-sr501.py - Movement Detection with the HC-SR501 PIR Sensor
hall_effect_digital.py - Hall-Effect Sensor Example - Switch or Latching Type
hall_effect_analog.py - Hall-Effect Sensor Example - Ratiometric Type