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Technically
a virtual COM port to connect to a serial device
robotics systems
a paralleled configuration can be chosen
1 Channel 5V Active Low Relay Module Soldering Technically1 Channel 5V Active Low Relay Board The 5V 1 channel relay module works with a 5V to 12V TTL control signal. It is perfect for controlling home appliances and for use in microcontroller projects. the 5V relay module can handle a 220V AC load, so you can use it to control motors, LED strips, or other devices. This single channel relay acts like a regular switch, keeping its contacts separate from the circuit it controls. It has an LED light to show