Hello, On 2021-11-21 09:14, Linux for blind general discussion wrote:
Hello, and what about turning off and on the cooling? What about writing script to automatically turn on and off the cooling when is needed or
My Raspberries run UEFI which takes care of all this. The only requirement is to use such a fan which is pwm controllable. Such fan has three leads. One for supply current, one for ground and the third for control. There is no need for any scripting in this case.
some script to turn on and off the cooling by key binding or command? Is it possible? I have Monitor toggle script to turn off and on the screen. Is it possible to do with cooling?
If you don't use UEFI but vanilla uboot then you need to take care of turning the aforementioned controllable fan on and off using one of the GPIO's. If you are running Raspberry OS it should have all the required libraries, bindings, scripts, etc. already. IMO the GPIO Raspberry OS uses by default is not the best choice since if memory serves correctly it uses one of the serial ports for control. If you are not using a fan which has a control lead then you would need to hack together such a circuit which turns on your fan power line. You can't power normal fan directly from GPIO pins. First, voltage level on GPIO pins is 3.3V. Second, the GPIOs aren't able to source enough current to power a normal fan. If you connect normal fan directly to GPIO pins you'd blow the corresponding SoC gates. Regards, Birdie _______________________________________________ Blinux-list mailing list Blinux-list@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/blinux-list