Maker Pro
Maker Pro

programmable on off timer (usb in and out) (LF sources)

horizon9

Apr 13, 2021
2
Joined
Apr 13, 2021
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i want to turn on and off a usb device (heating pads, total 10w or less) automatically. i think something like 5min ON, and 20min OFF. i haven't tested the heating pads yet, so i don't know what timings would be comfortable.

it would be powered by a portable usb power bank (yet to be purchased). my hope is that it can be really low power, like less than 1 watt or even less than 0.5 watts. but if not, i would like to know what power consumption it will be.

i don't know how to make circuits, i might be able to wire usb ports to an input and output if needed, with instructions.
 

Harald Kapp

Moderator
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Nov 17, 2011
13,682
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Nov 17, 2011
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i don't know how to make circuits,
Therefore I suggest you use an off the shelf module like e.g. this one.
The module operates from 5 V (there seem to be 12 V and 24 V versions, too, you need the 5 V version for operation from USB power). On-time and off-time are separately adjustable.
The relay can be used to switch the same 5 V power from the USB power bank to your load (heating pads).
I haven't worked with this module, I only looked it up acc. to the description, so unfortunately I cannot help you with details.
 
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