11/30/2023 0 Comments Arduino relay shield 230v![]() Reviewed in the United Kingdom on 24 November 2019 Will work with 3.3v logic if separate 5v VCC used for relay You may need to drag the pin high to turn fully off 4k7ohms Worked for me), Though this will depend on how you’re driving it. It works, but not as expected using either a high/low logical input to activate. ![]() I'm using a Pi myself (3.3v logic) so will just build an inverter/shifter (using a mosfet) to operate it (sink the input to ground when GPIO pin high) and run VCC off the USB 5v rail. Each input sinks ~0.3mA (VCC 3v) to ~2mA (VCC 5v) when operated. 3v is enough to operate the opto-coupler (mine needed just > 3v 260uA on each opto-coupler to operate and disengaged < 2.88v 160uA). With the relay VCC jumper removed and providing a separate 5V VCC for the relay, you can provide a separate 3.3v for the opto-coupler VCC (next to N2) and leave the GND pin unconnected (next to IN1). "Will this work with a 3.3v input instead of 5v?" The opto-couplers are then grounded (current sunk) using the IN1 and IN2 pins for either opto-coupler. If you remove the relay VCC jumper you separate the VCC for the relay and the opto-couplers. VCC is 5v and common for the opto-couplers. The opto-coupler isolates the input signal, the two GND (ground) pins are common and shared with the relay circuit, however the opto-coupler circuit does not use ground. "how can the opto-coupler provide isolation when the relay coil is directly connected to the arduino?" You need to drag it high to reliably turn it off. I was expecting to take the IN pins high for the relay to operate, but after seeing the circuit diagram on the 8 way version there is no way this is possible. you need to drag each pin low (to ground) for the relay to operate. These are input pins and not output (as I assumed before purchasing as they're named IN1 and IN2), however you need to sink them to operate the relay eg. ![]() IN1: high/low output, IN2: high/low output. With regards to "Yizhet 5V 2 Channel-Relay DC 5V 230V Relay Shield Module Control Board with Optocoupler for Raspberry Pi Arduino PIC AVR MCU DSP ARM TTL Logic (2 Channel)" Wenn 1.2k, wohl eher Glücksache ob es Lageunabhängig funktioniert. Das ganze passiert nur bei 3.3V IO, weil der PullUp für geringen Strom bei 5V ausgelegt ist, für 3.3V IO dann zu knapp. Hab den Vorwiderstand durch Parallelschaltung eines Widerstandes verkleinert, damit das nicht passiert. Datenblatt des Optokopplers ist bei dieser Strombegrenzung die Verstärkung so gering, dass der Transistor das Relais nicht halten kann. Es liegt an dem PullUp der bei mir 1.2k hat auf dem Produktbild 1.0k. Und genau liegt das Problem bei dem schalten des Relais bei Schräglage der Platine, wie ein User berichtet. Die Optokoppler LED schaltet man auf GND, welche einen PullUP eben auf 5V oder separate 3.3V hat, der auf der Relaisplatine ist. Jumper legt fest ob Single 5V supply welche für das Relais immer erforderlich ist, oder ohne Jumper mit 3.3V tolerante IOs wie z.B. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice.įür Bastler mit etwas elektronik Verstand sollte der Betrieb klar sein. You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. Click ‘Customise Cookies’ to decline these cookies, make more detailed choices, or learn more. Third parties use cookies for their purposes of displaying and measuring personalised ads, generating audience insights, and developing and improving products. This includes using first- and third-party cookies, which store or access standard device information such as a unique identifier. If you agree, we’ll also use cookies to complement your shopping experience across the Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice.
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