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# FeatherS2 MicroPython Helper Library
# 2021 Seon Rozenblum - Unexpected Maker
#
# Project home:
# https://feathers2.io
#
# 2021-Mar-21 - v0.1 - Initial implementation
# Import required libraries
from micropython import const
from machine import Pin, SPI, ADC
import machine, time
# FeatherS2 Hardware Pin Assignments
# LDO
LDO2 = const(21)
# APA102 Dotstar pins
DOTSTAR_CLK = const(45)
DOTSTAR_DATA = const(40)
# SPI
SPI_MOSI = const(35)
SPI_MISO = const(37)
SPI_CLK = const(36)
# I2C
I2C_SDA = const(8)
I2C_SCL = const(9)
# DAC
DAC1 = const(17)
DAC2 = const(18)
# LED & Ambient Light Sensor
LED = const(13)
AMB_LIGHT = const(4)
# Helper functions
# LED & Ambient Light Sensor control
def set_led(state):
l = Pin(LED, Pin.OUT)
l.value(state)
def toggle_led(state):
l = Pin(LED, Pin.OUT)
l.value(not l.value())
# Create ADC and set attenuation and return the ambient light value from the onboard sensor
def get_amb_light():
adc = ADC(Pin(AMB_LIGHT))
adc.atten(ADC.ATTN_11DB)
return adc.read()
# LDO2 power control
# When we manually turn off the second LDO we also set the DotStar DATA and CLK pins to input to
# prevent parasitic power from lighting the LED even with the LDO off, causing current use.
# The DotStar is a beautiful LED, but parasitic power makes it a terrible choice for battery use :(
def set_ldo2_power(state):
"""Set the power for the on-board Dotstar to allow no current draw when not needed."""
# Set the power pin to the inverse of state
ldo2 = Pin(LDO2, Pin.OUT)
ldo2.value(state)
if state:
Pin(DOTSTAR_CLK, Pin.OUT)
Pin(DOTSTAR_DATA, Pin.OUT) # If power is on, set CLK to be output, otherwise input
else:
Pin(DOTSTAR_CLK, Pin.IN)
Pin(DOTSTAR_DATA, Pin.IN) # If power is on, set CLK to be output, otherwise input
# A small delay to let the IO change state
time.sleep(0.035)
# Dotstar rainbow colour wheel
def dotstar_color_wheel(wheel_pos):
"""Color wheel to allow for cycling through the rainbow of RGB colors."""
wheel_pos = wheel_pos % 255
if wheel_pos < 85:
return 255 - wheel_pos * 3, 0, wheel_pos * 3
elif wheel_pos < 170:
wheel_pos -= 85
return 0, wheel_pos * 3, 255 - wheel_pos * 3
else:
wheel_pos -= 170
return wheel_pos * 3, 255 - wheel_pos * 3, 0
# Go into deep sleep but shut down the APA first to save power
# Use this if you want lowest deep sleep current
def go_deepsleep(t):
"""Deep sleep helper that also powers down the on-board Dotstar."""
set_ldo2_power(False)
machine.deepsleep(t)
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