Hi Mark.
If you don’t want the pins then remove them. Not difficult.
Cheers Bob
Hey there, @Mark285907,
Nope, the jumpers are presoldered to the board.
Unfortunately, we do not have any screw terminals with female jumper pins that would work with this setup. If you did want to make this board more permanent, then Bob is correct. The best bet would be to do desolder the pins already attached and solder on your own screw terminals.
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Hi Mark
Or solder the wire directly to the pins. Solder the wire down alongside the pin and use small length of heatshrinh over the joint and up the wire about 10mm for mechanical support.
Make the solder joint quickly with an adequate iron tip so you don’t overheat the pin and risk a damaged solder joint (dry joint) where the pin is soldered to the board.
For experimental purposes Core have some jumper leads with female connectors on one end which will plug onto the pins so you only have to solder the finished product once.
Cheers Bob
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Hi Core.
Can this relay board switch 24 VAC?
I ask because your product page only mentions DC but the spec sheet I have states AC & DC.
I have used this board in an irrigation controller to switch 24 VAC solenoids (400mA in rush, 250mA holding). The 24 VAC is supplied from a Toro branded 230v, 2 pin, double insulated Plug Pack. I assume this is nothing more sophisticated than a 230/24 transformer.
With the 24 VAC turned off, the relay board, Pi and logic works as expected. When I turn on the 24 VAC supply I find I get random switching of the Pi GPIO and associated relays. By this I mean when I switch relay 1 on, it’ll operate for <1s and then (say) relay 4 will come on instead.
I have the relay board inputs supplied with 3.3v, ground and the 4 GPIO. The JD-VCC jumper is open with the Pi’s 5v connected to the JD-VCC pin.
I have tried wiring and testing with the 24 VAC floating, grounded to house LV earth, and the Pi gnd. Make no difference.
Cheers.
Mark
Hi Mark
I don’t see why not as long as the 24VAC is ONLY connected to the relay switched CONTACTS and absolutely nothing else.If it is getting to the logic circuits somehow anything should be possible.
I think should be left floating to completely isolate it. I am assuming it is only supplying the solenoids. You should probably make sure it does not find an insidious ground connection somewhere. A resistance or continuity check between both sides of 24V to ground (particularly the electronics ground) could be revealing. Include the solenoid frame in this.
Cheers Bob
PS Have ALL your power sources got enough head room. Like has your 24VAC supply got enough to operate ALL the solenoids at once (worst case)
Thanks Bob.
The PS is rated at 750mA so plenty of capacity. The plan is for 4 solenoids but the logic is such that only one can operate at any time with a 10s delay between switching channels. I’m am testing with 1 solenoid connected.
I swapped out the 4 channel relay board for a 1 channel. Same issue so it’s not the board.
I replaced the 24VAC PS with a new 1A PS, same issue.
I’ll have to think on this as there’s something amiss somewhere.
Hey there, @Mark285907,
The attached relay is rated for the AC contact, but the PCB on the module isn’t. That being said, there should really be anything stopping it from working at 24 VAC with a 400 mA inrush and it certainly should not be causing the logic to be fritzing like that.
The random operation sounds more like interference from the inductive solenoids than contact overload. As @Robert93820 suggests, leave the isolated 24 VAC secondary floating, don’t connect it to the Pi ground or protective earth.
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