IR Light reflection switch, useful for obstacle avoidance or line following, for obstacle avoidance you can place this module in front of the sender /receive diodes that will cause the out pin to be pulled low at distance of 1cm.
photo interrupter is transmission type photo sensor that integrates optical receiving and transmitting elements in a single package please see the diagram below. Since the method involves light blocking commonly named photo interrupter. A long life infrared photo diodes is
This is the metal touch sensor module. This sensor is an electronic switching device. Basically, it will operate when touched by a charged any part of the body it triggers a high frequency which is generated by the transistor that
On this illustration we will going to wire the Reed Switch Module. This module provides an analog as well as digital interface, as you can see on the board it has a potentiometer / trimmer used as a pull up
Another illustration how to build a simple physical intrusion detection with laser and photoresistor (or light-dependent resistor, LDR, or photocell). This guide shows how to wire and build a laser tripwire that triggers an alarm or output when the laser
This is the Line Tracking Sensor designed for line following robots. The board has two main components IR Transmitter and IR Receiver in one package named TCRT5000. The TCRT5000 are reflective sensors which include an infrared emitter and photo-transistor in