4 viewed per hour
Detection range: 20cm to 150cm (7.9"-59")
Low microprocessor overhead (uses only 1 I/O line and a few lines of code)
Highly tolerant of ambient light and IR interference
Nearly immune to variations in object color and reflectivity
HC-SR04 Ultrasonic Distance Measuring ping Sensor
3W 850 infrared camera night vision light + sensor
sharp distance Infrared Proximity Sensor Long Rang
TEMT6000 Light Sensor Professional Module PIC ARM
HQ Black Line follower Infrared or Obstacle Avoidance IR sensor
K02 waterproof Ultrasonic Distance Measuring Module proximity sensor
Ultrasonic HC-SR04 Mount Holder ping sensor bracket
WS2812 RGB LED Breakout board module
stethoscope school experimental science kit doctor STEM DIY