The key switch module and the digital 13 interface come with LED to build a simple circuit, make the key reminder light. Use the LED of the digital 13 interface to connect the key switch sensor to the digital 3 interface. When the key switch sensor senses a key signal, the LED On, otherwise, it is off.
This module is suitable for college students, engineers, technicians, factory personal DIY, electronics enthusiasts, etc.

? Making small experiments
? product development
? production requirements
? instrumentation