Opto isolator question

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Originally Posted by magicniner

Not in the photo of your setup which you posted :D

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That's after I disconnected loads of wire :)

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Originally Posted by CharlieRam

That's after I disconnected loads of wire :)

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Oh, well that helps and isn't pointless at all :D

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Originally Posted by magicniner

Oh, well that helps and isn't pointless at all :D

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Yeah, in hindsight it wasn't the best image to show! [emoji23]

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I have had a quick look at the various arduino boards available

this looks like a ready made you can use (amazon are out of stock but it appears to on sale from ebay )
https://www.amazon.co.uk/d/Wall-Sock...ino/B01MRQFYJN

hi res readable picture from amazon advert
Attachment 25994

the small 16 pin IC is a quad opto isolator - part number PS2801-4



another possible board

https://ja.aliexpress.com/item/32748...3-954e0244d34d


Attachment 25995


I was going to say the problem with all of the chinese boards is the lack of information but
I have found this
http://www.ekt2.com/pdf/412_ARDUINO_...FET_SWITCH.pdf

Attachment 25996


john

Wouldn't a relay board be easier?

https://www.ebay.com/itm/1CH-2CH-4CH...H4U4QOng0awJrg

Cheers guys, I really appreciate the help. I went ahead and used my mosfets and soldered it up in the sun yesterday...boy it was hot!!
Anyway...its all sorted now although the red switches are very bright[emoji848]
Cheers again...my machine will hopefully be finished this year!https://uploads.tapatalk-cdn.com/201...6040c6949e.jpg

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Gerry

the relay board is a simple alternative to using transistors that some will prefer
( as always the best solution is the one that works for you )

the relay board has the advantage the outputs can be wired to either have a common +24V or common 0V / ground connection


Charlie

great result

do you have the option to use 28V bulbs in the switches ?

under run 28V bulbs will last longer


an alternative would be to add a resistor in series with the bulb
if the bulb takes 40 mA a 100 ohm resistor would drop the voltage by 4 V

john

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Originally Posted by john swift

Gerry

an alternative would be to add a resistor in series with the bulb
if the bulb takes 40 mA a 100 ohm resistor would drop the voltage by 4 V

john

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That was my thinking John, thanks.

Charlie

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