At this point, you should have just about everything already set up.

Besides the audio, the Voice Bonnet has quite a few other useful features on it that can be controlled through Python. We'll go through those and how to control them in Python.

Joystick and Button

The button uses simple digitalio, so it's really simple to control. Here's a little script that will setup the GPIO, create an internal pull up, and then print out the value to the terminal.

import time
import board
from digitalio import DigitalInOut, Direction, Pull

button = DigitalInOut(board.D17)
button.direction = Direction.INPUT
button.pull = Pull.UP

while True:
  if not button.value:
    print("Button pressed")
  time.sleep(0.01)

Go ahead and save the above code onto your Pi as button_test.py and run it with the following command:

python button_test.py

Now try moving the joystick and press the button and you should see it print out what you're pressing.

DotStar LEDs

The 3 DotStar LEDS can be controlled with the DotStar CircuitPython Library. Here's a little script that will setup the DotStar LEDs and then color cycle them.

import time
import board
import adafruit_dotstar

DOTSTAR_DATA = board.D5
DOTSTAR_CLOCK = board.D6

dots = adafruit_dotstar.DotStar(DOTSTAR_CLOCK, DOTSTAR_DATA, 3, brightness=0.2)

def wheel(pos):
    # Input a value 0 to 255 to get a color value.
    # The colours are a transition r - g - b - back to r.
    if pos < 0 or pos > 255:
        return (0, 0, 0)
    if pos < 85:
        return (255 - pos * 3, pos * 3, 0)
    if pos < 170:
        pos -= 85
        return (0, 255 - pos * 3, pos * 3)
    pos -= 170
    return (pos * 3, 0, 255 - pos * 3)

while True:
    for j in range(255):
        for i in range(3):
            rc_index = (i * 256 // 3) + j * 5
            dots[i] = wheel(rc_index & 255)
        dots.show()
        time.sleep(0.01)

Go ahead and save the above code onto your Pi as dotstar_test.py and run it with the following command:

python dotstar_test.py

The DotStar LEDs should start color-cycling in a rainbow.

GPIO JST connector

GPIO 12 is accessible with the JST connector on the bottom edge of the Voice Bonnet.

Parts

For this script, we'll just need one part that isn't included with the Voice Bonnet:

This tiny little servo can rotate approximately 180 degrees (90 in each direction), and works just like the standard kinds you're used to but smaller. You can use any...
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Wiring

  • Connect the JST PH 3-pin plug into the GPIO #12 on the Voice Bonnet

Code

import time
import board
import pulseio
from adafruit_motor import servo

SERVO_PIN = board.D12
pwm = pulseio.PWMOut(SERVO_PIN, frequency=50)
servo = servo.Servo(pwm, min_pulse=750, max_pulse=2250)

while True:
    for angle in range(0, 180, 5):  # 0 - 180 degrees, 5 degrees at a time.
        servo.angle = angle
        time.sleep(0.05)
    for angle in range(180, 0, -5): # 180 - 0 degrees, 5 degrees at a time.
        servo.angle = angle
        time.sleep(0.05)

Go ahead and save the above code onto your Pi as servo_test.py and run it with the following command:

python servo_test.py

The servo should start sweeping back and forth in 5 degree increments.

Stemma QT

For the Stemma QT port, you can use any of our 50+ sensors, but we're going to use a script that demonstrates using the BMP280 because it's so simple.

Parts

For this script, we'll just need a BMP280 and a Stemma QT cable:

Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the...
$9.95
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This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of...
$0.95
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Wiring

  • Connect one side of the Stemma QT cable to either port on the BMP280
  • Connect the other side to the Stemma QT port on the Voice Bonnet

Code

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""Simpletest Example that shows how to get temperature,
   pressure, and altitude readings from a BMP280"""
import time
import board

# import digitalio # For use with SPI
import adafruit_bmp280

# Create sensor object, communicating over the board's default I2C bus
i2c = board.I2C()  # uses board.SCL and board.SDA
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)

# OR Create sensor object, communicating over the board's default SPI bus
# spi = board.SPI()
# bmp_cs = digitalio.DigitalInOut(board.D10)
# bmp280 = adafruit_bmp280.Adafruit_BMP280_SPI(spi, bmp_cs)

# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25

while True:
    print("\nTemperature: %0.1f C" % bmp280.temperature)
    print("Pressure: %0.1f hPa" % bmp280.pressure)
    print("Altitude = %0.2f meters" % bmp280.altitude)
    time.sleep(2)

Go ahead and save the above code onto your Pi as bmp280_simpletest.py and run it with the following command:

python bmp280_simpletest.py

The terminal should start printing out the detected measurements.

This guide was first published on Oct 28, 2020. It was last updated on Oct 28, 2020.

This page (Python Usage) was last updated on Oct 22, 2021.

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