It'll work without it, but that level of electrical isolation depends on your definition of 'safe. The module allows independent control of one load connected to the output, and the optical separation of inputs from relays protects the device controlling the. I want to provide some sort of isolation for the Arduino board, but don't want to have multiple power supplies, I want to use only the 12V power supply comes with the LED strip to power everything, so the picture is what I came up with after some research. at 11:22 1 Either is OK, but if you are operating the relay at 5V, it's marginally safer to use the coupler since the ESP operates at 3.3V. So I'm trying to control a 12V 5A LED strip with my Arduino, only the on/off, I want to make it turn on when somebody walks by. NOTE: Some Raspberry-Pi users have found that some relays are. (To the input of the opto-isolator, next to the IN pins) should be connected to the 3.3V devices +3.3V supply. If it is desired to enable opto-isolation, remove the jumper and provide a separate 5V power supply voltage to the JD-VCC and GND pins on that connector. That 5V relay supply could be totally isolated from the 3.3V device, or have a common ground if opto-isolation is. The design and packaging affect the relay’s. This bypasses the opto-isolation circuit as it ties the relay power to the logic power, but it makes the device easier to use since just one power supply needs to be connected to the module. Form C Opto - Solid State Relay on Bonded Wafer with 1600V Isolation P. That means the relays use an LED or light emitting diode on their input side, MOSFETs or metal oxide semiconductor field effect transistors on their output side, and an array of photo sensors isolating the two. Proceedings of the International Symposiasic Charles E. First I want to say is I'm a beginner to Arduino and I know the same topic must have been asked many times, but after searching for a few hours I still have some questions unanswered. Another important feature of solid-state relays is they are optically isolated.
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