Relay Module

What information is typically displayed on the top of a relay module and is crucial for its operation?

• Manufacturer's name and logo

• Operating voltage and current rating

• Date of manufacture and serial number

• Country of origin and safety certifications

What are the three labeled positions on a relay module's terminal block used for connecting a load?

• Input, Output, Ground

• Positive, Negative, Neutral

• Normally Closed, Common, Normally Open

• High, Low, Medium

To completely opto-isolate a microcontroller from a relay module and protect it from potential electrical issues, what is the recommended connection method?

• Connect the microcontroller's 5V rail directly to the relay's VCC and JD-VCC pins.

• Use an external power supply for the relay module, remove the VCC/JD-VCC jumper, and disconnect the ground pins between the microcontroller and relay.

• Connect the microcontroller's GPIO pin directly to the relay's main transistor.

• Ensure the relay module has a built-in fuse and connect all grounds together.

Why is it cautioned not to connect the VCC-JD-VCC jumper on Relay Module One if the GPIO pin is used to drive the VCC input pin?

• The GPIO pin cannot provide enough current (70mA) to operate the relay.

• Connecting the jumper will reverse the polarity of the power supply.

• The optocoupler will be bypassed, leading to direct current flow.

• It will cause a short circuit in the microcontroller.

What is a key feature of Relay Module Two regarding its activation?

• It can only be activated when the GPIO pin is high.

• It requires an external power supply for activation.

• It can be activated by either a high or low signal from the GPIO pin, depending on the jumper setting.

• It uses a single-direction optocoupler for enhanced protection.