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Continue to Chat8051 - Relay Interfacing by using ULN2803 https://embetronicx.com/tutorials/microcontrollers/8051/relay-interfacing-with-8051/
8051 - Relay Interfacing by using ULN2803 https://embetronicx.com/tutorials/microcontrollers/8051/relay-interfacing-with-8051/