Is a resistor needed between the relay input and arduino pin, or is the current limited by the relay circuit? Would a resistor limit too much current?
626053
No you don't need a resistor. You can drive this directly from an arduino pin. In fact it is nicely isolated from the power used to turn the relay on and off. A really big resistor 100k or more might limit it too much. But it really in not needed at all.
1460717
You might want to check the relay for proper connection. I had the same problem at first and that's what it was for me
852840
I used my board with an Arduino (5V) and used a separat 5V source. It may work with a Pi (3.3V) logic but for best results you may still need a 5V supply.
894230
I have not found anything. Just assume it's a 5V input, and output is inverted (High input = relay OFF)
2225928
Yes, the pulse would need to be longer than the time set with the potentiometer (set screw). The timer starts when the 12vdc is applied and doesn't active the relay until the timer expires, break the 12vdc and the timer restarts. Hope this was helpful! -Jim
149343
I try them without load resistors, and it messed up my parking/stop lights. Had to take it to the dealer, charged me $86 bucks to fix. I just bought a relay.
1713461
I,m not sure but I expect there is an incompatibility between the electronics of the motion sensor and the relay coil. If the relay works properly using an on/off switch, it is likely that the motion sensor not the relay is at fault.
2005816
I had it working hooked up to the 5v arduino board. I do not have it on me at the moment but i connected all the pins to the board and ran it off some code i found online.
1017870
mine did NOT come with schematic or documentation of any kind. I would NOT expect it to operate a low current relay, the output will only trigger a logic level signal in the very low milliamp range. 0-5vdc
1385023
The amprobe RC -1205 relay switch it can be use in closet lights or other application the needs normally close relay . What r you trying to do ?
1206015
You have to supply 12V for Vcc and ground to the relays. The in1-4 can be triggered directly from Arduino outputs as long as your 5V and 12V supplies share a common ground.
2167174
i'm glad you asked. yes it can be. But in order to turn on the relays, input pins IN1, IN2, IN3.........etc have to be grounded.
1740571
It's a switch. Should have no problem activating a relay. Use the relay for any load compatible with the relay contacts.
1391030
Checking amperage has safety implications, and I suspect that's why low-cost units are limited to 20A. You can get more information from the following video: http://m.youtube.com/watch?v=ar7qkMHKw4
47634
The led's are connected in series with the opto isolator driving the relay. The input needs to be grounded to activate the led and the relay.
1000762
Maybe too much current. measure it and compare it to diode specks check to make sure the diode isn't shorted.
2215208
I have the same issue with one of my switches, it is ON all the time, have seen similar comments, it appears to be a common failure with these units. With that said I view it as an inconvenience not a safety issue. The output is only 12V and as long as each individual output is protected (as described) then each one should trip if it gets shorted or overloaded. However to be safe I would unplug the whole unit anytime you mess with the output wiring.