Fan Shim for Raspberry Pi

Installing

Stable library from PyPi:

• Just run sudo pip install fanshim

Latest/development library from GitHub:

• apt install git python3-pip
• git clone https://github.com/pimoroni/fanshim-python
• cd fanshim-python
• sudo ./install.sh

Reference

You should first set up an instance of the FANShim class, eg:

fromfanshimimportFanShimfanshim=FanShim()

Fan

Turn the fan on with:

fanshim.set_fan(True)

Turn it off with:

fanshim.set_fan(False)

You can also toggle the fan with:

fanshim.toggle_fan()

You can check the status of the fan with:

fanshim.get_fan() # returns 1 for 'on', 0 for 'off'

LED

Fan Shim includes one RGB APA-102 LED.

Set it to any colour with:

fanshim.set_light(r, g, b)

Arguments r, g and b should be numbers between 0 and 255 that describe the colour you want.

For example, full red:

fanshim.set_light(255, 0, 0)

Button

Fan Shim includes a button, you can bind actions to press, release and hold events.

Do something when the button is pressed:

@fanshim.on_press()defbutton_pressed():
print("The button has been pressed!")

Or when it has been released:

@fanshim.on_release()defbutton_released(was_held):
print("The button has been pressed!")

Or when it's been pressed long enough to trigger a hold:

fanshim.set_hold_time(2.0)
@fanshim.on_hold()defbutton_held():
print("The button was held for 2 seconds")

The function you bind to on_release() is passed a was_held parameter, this lets you know if the button was held down for longer than the configured hold time. If you want to bind an action to "press" and another to "hold" you should check this flag and perform your action in the on_release() handler:

@fanshim.on_release()defbutton_released(was_held):
ifwas_held:
print("Long press!")
else:
print("Short press!")

To configure the amount of time the button should be held (in seconds), use:

fanshim.set_hold_time(number_of_seconds)

If you need to stop Fan Shim from polling the button, use:

fanshim.stop_polling()

You can start it again with:

fanshim.start_polling()

Alternate Software

• Fan SHIM in C, using WiringPi - https://github.com/flobernd/raspi-fanshim
• Fan SHIM in C++, using libgpiod - https://github.com/daviehh/fanshim-cpp