83 lines
2.1 KiB
Python
83 lines
2.1 KiB
Python
|
# TinyS2 MicroPython Helper Library
|
||
|
|
# 2021 Seon Rozenblum - Unexpected Maker
|
||
|
|
#
|
||
|
|
# Project home:
|
||
|
|
# https://tinys2.io
|
||
|
|
#
|
||
|
|
# 2021-Apr-10 - v0.1 - Initial implementation
|
||
|
|
|
||
|
|
# Import required libraries
|
||
|
|
from micropython import const
|
||
|
|
from machine import Pin, SPI, ADC
|
||
|
|
import machine, time
|
||
|
|
|
||
|
|
# TinyS2 Hardware Pin Assignments
|
||
|
|
|
||
|
|
# Sense Pins
|
||
|
|
VBUS_SENSE = const(21)
|
||
|
|
VBAT_SENSE = const(3)
|
||
|
|
|
||
|
|
|
||
|
|
# RGB LED Pins
|
||
|
|
RGB_DATA = const(1)
|
||
|
|
RGB_PWR = const(2)
|
||
|
|
|
||
|
|
# SPI
|
||
|
|
SPI_MOSI = const(35)
|
||
|
|
SPI_MISO = const(36)
|
||
|
|
SPI_CLK = const(37)
|
||
|
|
|
||
|
|
# I2C
|
||
|
|
I2C_SDA = const(8)
|
||
|
|
I2C_SCL = const(9)
|
||
|
|
|
||
|
|
# DAC
|
||
|
|
DAC1 = const(17)
|
||
|
|
DAC2 = const(18)
|
||
|
|
|
||
|
|
|
||
|
|
# Helper functions
|
||
|
|
def set_pixel_power(state):
|
||
|
|
"""Enable or Disable power to the onboard NeoPixel to either show colour, or to reduce power fro deep sleep."""
|
||
|
|
Pin(RGB_PWR, Pin.OUT).value(state)
|
||
|
|
|
||
|
|
|
||
|
|
def get_battery_voltage():
|
||
|
|
"""
|
||
|
|
Returns the current battery voltage. If no battery is connected, returns 4.2V which is the charge voltage
|
||
|
|
This is an approximation only, but useful to detect if the charge state of the battery is getting low.
|
||
|
|
"""
|
||
|
|
adc = ADC(Pin(VBAT_SENSE)) # Assign the ADC pin to read
|
||
|
|
measuredvbat = adc.read() # Read the value
|
||
|
|
measuredvbat /= 8192 # divide by 8192 as we are using the default ADC voltage range of 0-1V
|
||
|
|
measuredvbat *= 4.2 # Multiply by 4.2V, our reference voltage
|
||
|
|
return round(measuredvbat, 2)
|
||
|
|
|
||
|
|
|
||
|
|
def get_vbus_present():
|
||
|
|
"""Detect if VBUS (5V) power source is present"""
|
||
|
|
return Pin(VBUS_SENSE, Pin.IN).value() == 1
|
||
|
|
|
||
|
|
|
||
|
|
# Dotstar rainbow colour wheel
|
||
|
|
def rgb_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_pixel_power(False)
|
||
|
|
machine.deepsleep(t)
|