google/periph

Implement driver for PC Cooler Axial Fan

c1tt1 opened this issue · 3 comments

c1tt1 commented

It would be good to provide a driver for a PC Cooler Axial Fan, or examples of how to interface with any Fan using pwm.

A few examples could be:

  • how to start a fan
  • how to stop a fan
  • how to change the duty cycle a fan while running
NeuralSpaz commented

This would depend on the type of fan , size of the fan and voltage, 3 or 4 wire pwm or linear. In most circumstances you will need external circuitry to drive the common 12V PC fan from most embedded PC's as their IO has typically a low drive capacity and at 1.8V, 3.3V or 5V level. eg Raspberry Pi is 50mA(max) @ 3.3V.

If you just need a PWM example: it is in there, its just not showing up in godoc, which now that I know, I will fix.

func ExamplePinOut_pwm() {
	// Make sure periph is initialized.
	if _, err := host.Init(); err != nil {
		log.Fatal(err)
	}

	// Use gpioreg GPIO pin registry to find a GPIO pin by name.
	p := gpioreg.ByName("GPIO6")
	if p == nil {
		log.Fatal("Failed to find GPIO6")
	}

	// Generate a 33% duty cycle 10KHz signal.
	if err := p.PWM(gpio.DutyMax/3, 10*physic.KiloHertz); err != nil {
		log.Fatal(err)
	}
}
c1tt1 commented

@NeuralSpaz Thanks for the example, my implementation was same as the above and glad for this confirmation.

It would be good to provide an example with a higher voltage fan, a case would be with a Raspberry Pi using a relay. Obviously the hardware DIY part would up to the user.

maruel commented

@kaskerd if I understand correctly you are asking for a new page on periph.io and no code change in the library; @NeuralSpaz fixed the doc in #345. Please file an issue on https://github.com/periph/website to track there.