I have a 4 channel relay module.
I connected it like this:
• VCC to 5V Arduino pin;
• GND to Arduino ground;
• IN1 to pin 3;
When I call: digitalWrite(3, LOW);
the relay's led turns on, but with a tester I find out that the AC is coming correctly in, but never comes out from the relay! The led is on, but relay doesn't switch power.
Where am I doing wrong?
Hi,
Need a link / photo of the board.
Check the 5V power voltage on the relay board.
If you have more than one channel turned on the Arduino probably cannot provide enough current.
terryking228, I have an Arduino 1.
I'm using 5V for more than just the relays, but the tester shows a lot of power that has to be enough for the relay.
There's something missing in the connection?
Hi, Need to see the relay board or link to it...
Ok this is my Relay board.
The white cable goes to +5V on Arduino.
The gray cable goes into pin 3.
The red cable goes into pin 5.
The blue cable goes into pin 6.
The green cable goes into one of the two GND pins on Arduino UNO board.
Here's the pic
vezzfra:
the tester shows a lot of power that has to be enough for the relay.
What does "a lot of power" mean?
What are you measuring, voltage? Terryking suspects there may not be enough current.
Check with your Ohm meter and the AC all disconnected to see if the relays are switching.
Hi,
OK that is like THIS RELAY BOARD
See more info HERE
If the individual LEDS for each relay come on then the signal is applied to the optoisolator.
If the jumper on the far right (check it) is in place from JS-VCC to VCC and you have 5V on Vcc the relay should operate.
Can you HEAR a relay activate?
Can you measure the voltage across the relay coil to confirm?
Suspicion: MAYBE a jumper cable is bad??
What you show looks right.. That means SOMETHING else is happening.
Thank you everyone, i solved the problem for 1 relay putting in VCC 7V and then again 5V. Maybe it was locked in someway.
The other two relays aren't still working, so I think I'll get a 5V adapter and give power to relays board only from it and not from Arduino.
I'll keep you update about the progress!
Thanks
The 2 left relays are wired incorrectly, there are wires connected to NO and NC, nothing to the COM terminals, 4 brown wires leave the picture, wonder where they go? How about a wiring diagram?
756E6C I know it, I've corrected the wiring just after posting the pic.
I tried connecting directly the module to the +5V of Arduino (before I was using that pin to supply power to it and to an lcd) and now every of the 3 relays switches, but only one at the time, I can I give it enough current to keep them on all together?
I tried also connecting a 5V adapter connecting VCC to positive and GND to negative, but the board has not even turn on.
Any advice?
I tried also connecting a 5V adapter connecting VCC to positive and GND to negative, but the board has not even turn on.
That power supply is not working...
Ok everything solved! Thank you so much!
