Opto isolator question

[CharlieRam]

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

That's after I disconnected loads of wire :)

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[magicniner]

That's after I disconnected loads of wire :)

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

[CharlieRam]

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

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

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[john swift]

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


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





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




john

[CharlieRam]

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
Cheers again...my machine will hopefully be finished this year!

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[john swift]

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

[CharlieRam]

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

That was my thinking John, thanks.

Charlie

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