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Module with one 5 V relay with a maximum switching current of 10 A. It communicates via a USB interface and does not require additional power supply. Numato Lab NLRL1001-A
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Module with one relay and 4 IO pins (3 with analog input function) supporting communication via USB. It can control devices with a current of up to 10 A. The USB interface makes it easy for the user to connect the module to any devices running Windows, Linux, Mac or embedded computers such as RPi. It comes with software that supports simple commands to control relays and read their status. When connected to a computer, the board appears as a serial port and can be operated by serial terminal applications such as HyperTerminal or Putty. Due to the fact that it uses 5 V relays, it does not require additional power supply (only via the USB port). It is perfect for automation systems. Full documentation is available on the product page.
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Module with one 5 V relay with a maximum switching current of 10 A. It communicates via a USB interface and does not require additional power supply. Numato Lab NLRL1001-A