Add possibility to use suspend mode when using CoreELEC on USB device
This modification do require advanced user skills by using a solder iron.
The USB 5V are controlled by a step-down converter. This converter do have a enable pin.
By pulling this pin high to Vin it get enabled. By pulling the enable pin low the converter is disabled.
The enable pin is controlled by the device u-boot by pull high/low a GPIO pin.
This GPIO pin will drive a simple Mosfet what will pull down the enable pin of the converter if set.
So when the Mosfet is removed the USB 5V are permanent on.
Homatics is not able to remove the code line in u-boot source what do set/clear this GPIO pin because it’s out of their control.
Location to find the Mosfet (Homatics Dune R4 Plus, PCB 2022.3.25, SMB.280.08D)
This is a Transistor, therefore a floating Base (orange) is uncritical, as there will be no Base current to be amplified. But agree, this is not state-of-art engineering, more a pragmatic workaround.
Anyone still being concerned about floating Bases (orange), can tie the Base to GND (yellow)
With this mod, I can use the box under CE, with IR mode, include ON/OFF the box with original remote. This mod voids the warranty, use in your own risk.
The (1). I soldered an IR diode (CHQ1838** type, but others maybe good too)
in the indicated place.
– Later, due to the better signal, I did not cut the diode’s legs on the second test, but bent them in a double L shape (4).—
Before the Diode, I thinned the material of the housing from the inside with a small ball grinder (3). Thus, even under CE, the remote control works in IR mode, there is no problem like with the Bluetooth connection, there is no need to pair.
For IR mode use this remote.conf file, place your root of CE pendrive, or config folder, in CE.
Months ago when i did this IR mod ,i had to drill a small hole in front of the receiver ,otherwise it had very poor reception .
Later ,after Frodo019 did the mod and said that he only used the grinder to make the plastic thiner ,i tried it on a second mod,but it was great only without the top cover.
The top cover holds the LEDs PCB and that goes exactly on top of the IR Receiver ,which imho not only blocks the signal but also create interferences (even the mod which has the hole in front of the IR receiver is affected by the top cover ,but less).