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the grounds can be kept separate
Type-C USB Port
“-” connected GND
The sensor works by shining a white light on an object and measuring the amount of red
RS232 to TTL Converter (MAX232) is widely used in the world of microcontrollers
Relay Module (2 Channels - 24V) Dot Matrix Module the grounds can be keptIntroduction : It is a 2 channel relay board, which can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, PLC, etc. It is also able to control various appliances and other equipment with large current. used where it is necessary to control a circuit by a low power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal.
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