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No reason why you can't run my controller at 5V, although it might be a bit of overkill if all you want is manual control of heating.
Also, you could run into trouble because a 5V @ 2.4A power source is only a bit over 10W. This might not be enough for many heater applications e.g. heating a big chunk of glass or having multiple things to heat.
I have also used aliexpress usb heater straps with my device as they are so cheap. Just replaced the wiring with 4-core cable to add a temperature sensor.
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