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Author Topic: Using digital outputs to switch 24v DC  (Read 1481 times)
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Gloucester, UK
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Using the arduino digital outputs can someone tell me what circuit I need to switch 24v DC on/off. Each 24V line will only be using 50mA and I have a 24v DC power supply. I need 4 independant channelsor devices to control some pneumatic pilot valves. An RS component code would be a perfect answer.

I know it's a simple electronic question but I'm good with mechanisms rather than the electroncis behind them lol

regards
Kev
« Last Edit: April 29, 2009, 03:58:05 pm by Photosbykev » Logged

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Most of the relay circuits that have been posted will work on 24 volts, such as this one: http://www.arduino.cc/playground/uploads/Learning/relays.pdf
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Gloucester, UK
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wow I didn't even know that the playground existed, that should stop me looking like a newb for awhile lol

thanks for the prompt response smiley

Kev
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I think a chip such as the ULN2803 would be a good choice.  It's rated for up to 50V switching, at 500mA per channel, eight channels.
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Thank you for the suggestion
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Would this system work with 12V at about 5 A.? I want to control some wiper motors with the arduino board.
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The ULN2803 is limited to 500mA per output.  You'd need something rather larger to switch 5A.  Maybe a power transistor or power MOSFET?
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Some circuit suggestions for higher-power switching (without relays) are here.
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