Gorillacell Module 039: Speed Sensor

The Photoresistor is a light-sensitive sensor that changes its resistance based on the amount of light it receives. When exposed to light, its resistance decreases, and when the light is obstructed, its resistance increases.

This behavior can be utilized in speed measurement applications. By detecting the number of times the light is interrupted (for example, by holes in a rotating disk) within a given period, and knowing the number of holes per rotation, the rotational speed can be calculated.

The Gorillacell ESP32 Development Kit includes one Photoresistor module for experimenting with light detection, speed sensing, and other photo-based applications.

BASIC INFORMATION

PINOUT

It has 3 pins which are

1. G - for the ground pin,
2. V - for the supply voltage, and
3. S - for determining the logic state of the Photoresistor module.

It is logic 1 when obstructed else logic 0.