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  1. 17-08-2015 #8
    HankMcSpank's Avatar
    Lives in London, United Kingdom.
    HankMcSpank
    Last Activity: 10-06-2024 Has been a member for 9-10 years. Has a total post count of 623. Received thanks 10 times, giving thanks to others 59 times.
    Without a diagram of your particular situation, all we have to go on is this....

    Quote Originally Posted by Boyan Silyavski View Post
    Hi, how do i deal when a board / Pokeys57CNC does not output enough current on output 5v pins to switch a external relay / 8 channel relay board 5vdc /??
    If you get a multi-meter & see what the resistance is between the Pokeys57CNC 0V rail & the relay board's 0V rail ....if it's high resistance , then there's no common path (& therefore this is why your relay's aren't switching).... you will need to link the 0Vs on both boards together. Voltage is always 'with reference to another point' ...i.e. the 5V on your Pokeys57CNC is in reference to the Pokeys57CNC 0V, the 5V on your relay board is in reference to your relay board's 0V...the only way you can make the 5V on your Pokeys57CNC mean anything to your relay board is to commonize the 0V rails on both boards....join them together.
    Last edited by HankMcSpank; 17-08-2015 at 11:44 AM.
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