91 lines
2.5 KiB
Python
91 lines
2.5 KiB
Python
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# FeatherS2 Neo MicroPython Helper Library
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# 2021 Seon Rozenblum - Unexpected Maker
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#
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# Project home:
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# https://unexpectedmaker.com/feathers2-neo
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#
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# 2021-Sep-04 - v0.1 - Initial implementation
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# Import required libraries
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from micropython import const
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from machine import Pin, ADC
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import machine, time
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# FeatherS2 Neo Hardware Pin Assignments
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# Sense Pins
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VBUS_SENSE = const(34)
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VBAT_SENSE = const(2)
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# RGB LED Pins
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RGB_DATA = const(40)
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RGB_PWR = const(39)
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# RGB MATRIX LED Pins
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RGB_MATRIX_DATA = const(21)
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RGB_MATRIX_PWR = const(4)
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# SPI
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SPI_MOSI = const(35)
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SPI_MISO = const(37)
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SPI_CLK = const(36)
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# I2C
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I2C_SDA = const(8)
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I2C_SCL = const(9)
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# DAC
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DAC1 = const(17)
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DAC2 = const(18)
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# Helper functions
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def set_pixel_power(state):
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"""Enable or Disable power to the onboard NeoPixel to either show colour, or to reduce power for deep sleep."""
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Pin(RGB_PWR, Pin.OUT).value(state)
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def set_pixel_matrix_power(state):
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"""Enable or Disable power to the onboard NeoPixel RGB Matrix to either show colours, or to reduce power for deep sleep."""
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Pin(RGB_MATRIX_PWR, Pin.OUT).value(state)
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def get_battery_voltage():
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"""
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Returns the current battery voltage. If no battery is connected, returns 4.2V which is the charge voltage
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This is an approximation only, but useful to detect if the charge state of the battery is getting low.
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"""
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adc = ADC(Pin(VBAT_SENSE)) # Assign the ADC pin to read
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measuredvbat = adc.read() # Read the value
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measuredvbat /= 8192 # divide by 8192 as we are using the default ADC voltage range of 0-1V
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measuredvbat *= 4.2 # Multiply by 4.2V, our reference voltage
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return round(measuredvbat, 2)
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def get_vbus_present():
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"""Detect if VBUS (5V) power source is present"""
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return Pin(VBUS_SENSE, Pin.IN).value() == 1
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# NeoPixel rainbow colour wheel
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def rgb_color_wheel(wheel_pos):
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"""Color wheel to allow for cycling through the rainbow of RGB colors."""
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wheel_pos = wheel_pos % 255
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if wheel_pos < 85:
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return 255 - wheel_pos * 3, 0, wheel_pos * 3
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elif wheel_pos < 170:
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wheel_pos -= 85
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return 0, wheel_pos * 3, 255 - wheel_pos * 3
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else:
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wheel_pos -= 170
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return wheel_pos * 3, 255 - wheel_pos * 3, 0
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# Go into deep sleep but shut down the RGB LED first to save power
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# Use this if you want lowest deep sleep current
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def go_deepsleep(t):
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"""Deep sleep helper that also powers down the on-board NeoPixel."""
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set_pixel_power(False)
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set_pixel_matrix_power(False)
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machine.deepsleep(t)
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