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Editorial Team
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Asked: 2026-06-06T11:21:38+00:00

I have an application that one of it’s features needs to control an electrical

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I have an application that one of it’s features needs to control an electrical circuit of some device (open and close a circuit). Since i have no background in electronics i really don’t know where to start.
I looked at some articles and found that i might need some kind of an RS232 relay device but i really don’t have a clue if this is the right approach.
any help or guidance would be appreciated.

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1 Answer

  1. Editorial Team

    I will assume that this is a low-budget project – something like this would work :

    http://www.easydaq.biz/PagesUSB/USBRelayCardProductsFRAME2.htm

    Relay cards are available in USB, PCI, etc. Google will help you find something in your price range, deliverable in your region, and with a suitable number of outputs.

    There are DIY ultra-cheap options, however. This would generally involve using the LPT printer port as a DIO port. The 5V lines can be used to activate power transistors that drive coils in similar relays. Have to solder your own for this kind of project. LPT bits can be set with very simple low-level memory writes.

    For commercial or industrial application the prices go up (as does reliability) and the correct unit would depend heavily on the specific application and environment.

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