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Glurp
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Topic # 173359 20-May-2015 15:45
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Most electronics devices nowadays have an on/off button that doesn’t really turn on or off, but simply toggles between active mode and standby. If the power goes off and then comes back on, the unit usually comes on in standby mode.

I would really like to be able to change this behaviour and have a device come on in active mode whenever power is present. My question is whether this is controlled by a standard chip or circuit that is the same across different devices, and what would be involved in making such a modification. Would this be a difficult thing to do? I know enough electronics to assemble kits and make certain modifications, but not enough to design my own circuits.






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  Reply # 1308582 20-May-2015 15:55
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No, this isn't controlled by a standard circuit. In most cases it will be software controlled, e.g. in response to IR codes or button presses interpreted by a microcontroller.

In the case of a simple button, which is almost certainly just a high/low value, you could replicate this externally if you can detect the device is in standby.

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  Reply # 1308782 20-May-2015 20:10
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If the device is a desktop computer. There will probably be a setting in cmos setup. To make it switch on when power is connected. And if it is something that is controlled by a remote. Make a Arduino based IR blaster.





 
 
 
 


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  Reply # 1308788 20-May-2015 20:13
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Had this with the TV I was putting in my arcade cabinet. An old 90s or early 2000s tube 4:3 thing.

Anyway, holding the power button down with a stack of washers and some tape got the behaviour I was looking for. AC on, TV starts. AC gone, TV off.




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