Yizhet Relay 5V 4 Channel, DC 5V 230V Relay Shield Module Control Board with Optocoupler for Raspberry Pi Arduino PIC AVR MCU DSP ARM TTL Logic (4 Channel)

I've been using various of these devices for 4 years now for various home automation solutions, such as for remotely opening and closing garage doors. They have been reliable to date, and can be easily used with RaspberryPis or Arduino devices. Programming is easy; just send a signal to close the relay, and stop the signal to open it, allowing a normal 240V circuit to be completed. I'm really happy with their performance.

Works perfectly, solid construction, good quality soldering and a good price. What more could you ask.

item as advertised and at a good price.

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)" It works, however not as expected. "... IN1: high/low output, IN2: high/low output ..." 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. you need to drag each pin low (to ground) for the relay to operate. 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 it high to reliably turn it off. _Others asked_ "how can the opto-coupler provide isolation when the relay coil is directly connected to the arduino?" 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. VCC is 5v and common for the opto-couplers. If you remove the relay VCC jumper you separate the VCC for the relay and the opto-couplers. The opto-couplers are then grounded (current sunk) using the IN1 and IN2 pins for either opto-coupler. "Will this work with a 3.3v input instead of 5v?" 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). 3v is enough to operate the opto-coupler (mine needed just > 3v @ 260uA on each opto-coupler to operate and disengaged < 2.88v @ 160uA). Each input sinks ~0.3mA (VCC 3v) to ~2mA (VCC 5v) when operated. 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. I was hoping to avoid this, but hey ho... _Summary_ - It works, but not as expected using either a high/low logical input to activate. It’s only low to activate. You may need to drag the pin high to turn fully off (@5v, 4k7ohms Worked for me), Though this will depend on how you’re driving it. - Would I buy again? YES Hope this helps folks. More Foobar from the FooGarage... :-)

Great little 5V trigger 240V relay with both Normally Closed and Normally Open connections.

Bent pins when it arrived - Bad start. wired up - did not power on. I had a different relay board from an old project, I took the JST connector straight off this board and plugged into my old one - powered on immediately. Undoubtably a Duff Board, not impressed.

So simple after fiding the circuit diagram So if you need help message it Thanks 5*

Nice compact unit works with pi

Goederen zijn van goede kwaliteit en geleverd zoals omschreven?

Good relay. I was able to drive all 8 channels using raspberry pie directly

Después de usarlo unas semanas empieza a dar algún fallo

This is not specified anywhere, but this board is active LOW. It works, but it won't fit my needs as Pi's boot pins low (which would trigger relays during boot).

Funzionano alla perfezione sia con ESP32 che con R1 GiGA di Arduino, prodotto ottimo ad un costo corretto