Thread: not enough current for relays?
I have one of those relay boards (or at least one that looks remarkably like it) - I drive it directly with the 5V out from a CNCUSB Mk2/9 board digital output - no issues.
I'd measure the DC resistance of your relay coil...I'd wager you can probably short out that output 100 Ohm resistor (which should then see sufficient current to energize the relay) ...else play on the safe side & put something like a 10 ohm resistor across it (i.e. in parallel with it)
Last edited by HankMcSpank; 11-08-2015 at 08:03 PM.
You may have a faulty board. Try hooking it up to a 5v power supply and see if you get a relay operating with 5v from the same supply. Some boards I have switch the relay on with 0v and off with 5v. Also check the jumpers.
Last edited by cropwell; 11-08-2015 at 09:19 PM.
Actually ignore my last post...if your relay board is the same as mine, from recollection the 5V from your driving IO pin, doesn't energize the relay directly, but does so via a tranny/fet. Are you supplying the relay board with a separate 5V supply?
Last edited by HankMcSpank; 11-08-2015 at 09:32 PM.
Last edited by HankMcSpank; 15-08-2015 at 01:57 PM.
Guys, so i have BOB powered by separate 24VDC PSU and relay board powered by 5VDC PSU. Both grounds are connected/the earth, the body.
So you say now i need to connect the together the 2 - /minus / pins of both the PSUs?
Makes sense though i have never done that before on other boards and they worked
Without a diagram of your particular situation, all we have to go on is this....
Last edited by HankMcSpank; 17-08-2015 at 10:44 AM.
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