PC817 Optoisolator Module 2-Channel 3.6-30V PCB Mount for Arduino Description: This module enables the use of a low-level signal to control a higher-level voltage, for example, using a 3V or 5V signal to control a 9V or 12V voltage. It employs the PC817 optoisolator,  which is known for its optical isolation capabilities. The module offers two independent channels, allowing you to work with two separate input-output pairs simultaneously. The module incorporates a jumper switch that allows you to toggle the output between high and low states. This provides flexibility in configuring the output. Suitable for use with Arduino or other microcontroller platforms. Particularly useful in circuits where there is a need for electrical isolation, especially in environments with a lot of electrical noise. This helps in preventing interference or damage to sensitive components. This module proves to be valuable in scenarios where there's a requirement for isolating low and high voltage circuits while still allowing them to communicate effectively.  It's commonly employed in environments where noise or interference can disrupt signal integrity. Voltage Range: Input Voltage Range: 3.6V to 24V Output Voltage Range: 3.6V to 30V This means it can handle signals and voltages within these specified ranges.