59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
import time
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from machine import Pin
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from pimoroni import Analog, AnalogMux, Button
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from plasma import WS2812
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from servo import servo2040
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"""
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Show how to read the 6 external sensors and
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display their values on the neighbouring LEDs.
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Press "Boot" to exit the program.
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NOTE: Plasma WS2812 uses the RP2040's PIO system, and as
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such may have problems when running code multiple times.
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If you encounter issues, try resetting your board.
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"""
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BRIGHTNESS = 0.4 # The brightness of the LEDs
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UPDATES = 50 # How many times to update LEDs and Servos per second
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# Set up the shared analog inputs
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sen_adc = Analog(servo2040.SHARED_ADC)
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# Set up the analog multiplexer, including the pin for controlling pull-up/pull-down
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mux = AnalogMux(servo2040.ADC_ADDR_0, servo2040.ADC_ADDR_1, servo2040.ADC_ADDR_2,
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muxed_pin=Pin(servo2040.SHARED_ADC))
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# Set up the sensor addresses and have them pulled down by default
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sensor_addrs = list(range(servo2040.SENSOR_1_ADDR, servo2040.SENSOR_6_ADDR + 1))
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for addr in sensor_addrs:
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mux.configure_pull(addr, Pin.PULL_DOWN)
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# Create the LED bar, using PIO 1 and State Machine 0
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led_bar = WS2812(servo2040.NUM_LEDS, 1, 0, servo2040.LED_DATA)
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# Create the user button
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user_sw = Button(servo2040.USER_SW)
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# Start updating the LED bar
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led_bar.start()
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# Read sensors until the user button is pressed
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while not user_sw.raw():
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# Read each sensor in turn and print its voltage
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for i in range(len(sensor_addrs)):
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mux.select(sensor_addrs[i])
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sensor_voltage = sen_adc.read_voltage()
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# Calculate the LED's hue, with Green for high voltages and Blue for low
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hue = (2.0 - (sensor_voltage / 3.3)) * 0.333
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led_bar.set_hsv(i, hue, 1.0, BRIGHTNESS)
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print("S", i + 1, " = ", round(sensor_voltage, 3), sep="", end=", ")
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print()
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time.sleep(1.0 / UPDATES)
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