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Adding rotary QT NeoPixel example. #73

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Merged
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Jun 8, 2021
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Adding rotary QT NeoPixel example. #73

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Adding rotary QT NeoPixel example.
kattni Jun 8, 2021
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Add license.
kattni Jun 8, 2021
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kattni Jun 8, 2021
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51 changes: 51 additions & 0 deletions examples/seesaw_rotary_neopixel.py
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# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
# SPDX-License-Identifier: MIT

"""I2C rotary encoder NeoPixel color picker and brightness setting example."""
import board
from adafruit_seesaw import seesaw, neopixel, rotaryio, digitalio

try:
import _pixelbuf
except ImportError:
import adafruit_pypixelbuf as _pixelbuf

# For use with the STEMMA connector on QT Py RP2040
# import busio
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Is busio the thing to import here? This is actually a point I'm trying to get a better handle on--when and when not to import busio

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busio only need to be imported if you have to specify individual I2C pins or I2C pins other than SCL and SDA. Otherwise, use board.I2C() which is basically an object representing board.SCL, board.SDA. In the case of the QT Py RP2040 STEMMA connector, it's SDA1 and SCL1, so it would need busio.

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Ah, that clears it up, I was afraid I needed to worry about clock timing issues on boards and I just didn't know how to begin knowing when and when not to use it.

Thank you for the explanation!

# i2c = busio.I2C(board.SCL1, board.SDA1)
# seesaw = seesaw.Seesaw(i2c, 0x36)

seesaw = seesaw.Seesaw(board.I2C(), 0x36)

encoder = rotaryio.IncrementalEncoder(seesaw)
switch = digitalio.DigitalIO(seesaw, 24)

pixel = neopixel.NeoPixel(seesaw, 6, 1)
pixel.brightness = 0.5

last_position = -1
color = 0 # start at red

while True:
position = encoder.position

if position != last_position:
print(position)

if switch.value:
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If you rotate the encoder, and then wait a bit before you press the switch I don't believe this code executes. Is that the intended behavior or should this if switch.value call be outside of the if position != last_position, or am I not reading this code correctly (I do need to top off my coffee).

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The code executes when I try to replicate what you're suggesting. I'm not sure if I'm simply not doing it in the manner you're suggesting or if the code is fine. I'm going to merge this, we can continue the discussion if you have suggestions and I can make changes if needed in another PR.

# Change the LED color.
if position > last_position: # Advance forward through the colorwheel.
color += 1
else:
color -= 1 # Advance backward through the colorwheel.
color = (color + 256) % 256 # wrap around to 0-256
pixel.fill(_pixelbuf.colorwheel(color))

else: # If the button is pressed...
# ...change the brightness.
if position > last_position: # Increase the brightness.
pixel.brightness = min(1.0, pixel.brightness + 0.1)
else: # Decrease the brightness.
pixel.brightness = max(0, pixel.brightness - 0.1)

last_position = position