030172f523
Captures everything needed to redeploy the two-display clock (hour on I2C 0x61, minute on I2C 0x63) on a fresh Pi: - Both systemd units (matrix0x61.service, matrix0x63.service) - Deployed Pimoroni script tree, including the local %I (12-hour) clock customization - Vendored upstream sources (ltp305-python, breakout-garden) so restore is fully offline-capable - Boot config snippet enabling I2C - install.sh that wires it all back up idempotently - Inventory doc cross-referencing every live-system path Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
101 lines
2.8 KiB
Python
Executable File
101 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python3
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import time
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import math
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import colorsys
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from lsm303d import LSM303D
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from rgbmatrix5x5 import RGBMatrix5x5
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print("""This Pimoroni Breakout Garden example requires an LSM303D
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Motion Sensor Breakout and a 5x5 RGB Matrix Breakout.
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The Rainbow Compass calculates and displays compass heading as an
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RGB colour around the hue wheel, with North being red, South cyan,
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East green, and West purple, appromximately.
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Press Cyrl-+C to exit.
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""")
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def raw_heading(minimums, maximums, zero=0):
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"""Return a raw compass heading calculated from the magnetometer data."""
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X = 0
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Y = 2 # Change to 1 if you have the breakout flat
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# The range over which values will be calculated, i.e. -1 to +1
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mag_range = 2
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# Get the magnetometer's values
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mag = list(lsm.magnetometer())
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# Scale and shift values
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for i in range(len(mag)):
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mag[i] = ((mag_range / (maximums[i] - minimums[i])) * mag[i]) - \
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(mag_range / 2.0)
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# Calculate the heading from the vector
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heading = math.atan2(mag[Y], mag[X])
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if heading < 0:
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heading += (2 * math.pi)
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# Convert radian value to degrees
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heading_degrees = (round(math.degrees(heading), 2) - zero) % 360
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return heading_degrees
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lsm = LSM303D(0x1d) # Change to 0x1e if you have soldered the address jumper
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# Set up the 5x5 RGB matrix
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rgbmatrix5x5 = RGBMatrix5x5()
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rgbmatrix5x5.set_clear_on_exit()
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rgbmatrix5x5.set_brightness(0.8)
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# Python 2/3 compatibility
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try:
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input = raw_input
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except NameError:
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pass
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input("Lay your LSM303D in Breakout Garden flat (LSM303D vertical), \n\
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press a key to start, then rotate it 360 degrees, keeping it flat...\n")
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# Variables to govern calibration time
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t_start = time.time()
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t_elapsed = 0
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calibration_time = 30
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# Initial values for mins and maxs
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minimums = list(lsm.magnetometer())
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maximums = list(lsm.magnetometer())
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# Run calibration until time limit is reached
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while t_elapsed < calibration_time:
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mag = lsm.magnetometer()
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for i in range(len(mag)):
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if mag[i] < minimums[i]: # Set new min
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minimums[i] = mag[i]
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if mag[i] > maximums[i]: # Set new max
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maximums[i] = mag[i]
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t_elapsed = time.time() - t_start
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input("Calibration complete!\n\nIf you want to set a zero (North) point, \n\
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then turn your breakout to that point and press a key...\n")
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# Zero point for the compass
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zero = raw_heading(minimums, maximums)
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input("Press a key to begin readings!\n")
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# Begin compass readings and display on RGB matrix
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while True:
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rh = raw_heading(minimums, maximums, zero=zero)
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hue = rh / 360.0 # Hue is based on compass heading
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r, g, b = [int(c * 255) for c in colorsys.hsv_to_rgb(hue, 1.0, 1.0)]
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rgbmatrix5x5.set_all(r, g, b) # Set whole matrix to calculated RGB
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rgbmatrix5x5.show()
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print("compass heading: {:0.0f} degrees".format(rh))
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time.sleep(0.1)
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