Mix and Match Inputs and Outputs
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A MicroPython code example running on a Raspberry Pi Pico 2 W microcontroller connected to a micro servo motor, an RGB LED, a passive piezo buzzer, an OLED display module (SSD1306) and one of several input components - an accelerometer, push button, motion sensor, photoresistor, joystick, microphone, rotary encoder, or another sensor - on a breadboard to read the input data from the selected component and interpolate it to a buzzer frequency, an LED color and a servo angle, and display the values on the display
This is the kitchen sink catch-all script that lets you mix and match different inputs and outputs. The sensor readings are converted to LED color, servo angle, buzzer frequency and text on the OLED screen. Refer to the relevant circuit diagrams above based on the input you choose.
Create a new file in Thonny, with file name mix_and_match.py. Copy and paste the code below into the file you created.
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print("\nMix and Match")
# DESCRIPTION
# This is the kitchen sink catch-all script that lets you mix and match
# different inputs and outputs. The sensor readings are converted to LED color,
# servo angle, buzzer frequency and text on the OLED screen.
# CONNECTIONS REQUIRED
# Connect Servo
# Pins: Brown: GND, Red: VCC, Yellow: GP9
# Select an input by modifying the input variable below, and connect
# the corresponding module using pins listed next to its name.
input = 2
input_names = {
1: "Accelerometer", # Pins: GND => GND, VCC => VCC, SDA => GP6, SCL => GP7 (Connect ADXL345 module using only the 4 pins on the right side)
2: "Buttons", # No additional connections are needs. The 6 buttons are connected to GP0 through GP5
3: "Crash Sensor", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect Crash Sensor (KY-021) module)
4: "Distance Sensor", # Pins: VCC => VCC, Trig => GP19, Echo => GP18, GND => GND (Connect HC-SR04 module)
5: "Joystick", # Pins: GND => GND, +5V => VCC, VRX => GP27, VRY => GP26, SW => GP17 (Connect Joystick (KY-023) module)
6: "Knock Sensor", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect Knock Sensor (KY-031) module - labeled 'Digital Sensor' with an encased spring)
7: "Microphone Sensor", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect Microphone Sensor (KY-037) module - with a cylindrical mic with black circular pad on top)
8: "Motion Sensor", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect PIR Motion Sensor (HC-SR501) module)
9: "Photo Interrupter", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect Photo Interrupter (KY-010) module - labeled 'IR Switch')
10: "Photoresistor", # Pins: GND => GND, VCC => VCC, S => GP28 (Connect Photoresistor (KY-018) module - labeled 'Analog Sensor' with a small round head with squiggly line)
11: "Potentiometer", # Pins: GND => GND, VCC => VCC, S => GP28 (Potentiometer module - labeled 'Rotation Sensor')
12: "Rotary Encoder", # Pins: GND => GND, VCC => VCC, SW => GP22, DT => GP21, CLK => GP20 (Connect R E Sensor (KY-040) module)
13: "Touch Sensor" # Pins: GND => GND, VCC => VCC, SIG => GP28 (Connect Touch Sensor module - blue board with concentric circles)
}
from machine import Pin, SoftI2C, ADC
from oled import OLED
from buzzer import Buzzer
from rgbled import RGBLED
from servo import Servo
from helper import interpolate
# Output Initialization
oled = OLED(scl_pin=15, sda_pin=14)
buzzer = Buzzer(pwm_pin=16)
rgbled = RGBLED(red_pin=12, green_pin=11, blue_pin=10)
servo = Servo(servo_pin=9)
red = 0
green = 0
angle = 90
freq = 0
# Input Initialization
input_name = input_names[input]
print(f"\n{input_name}")
value = 0
value_min = 0
value_max = 1
def input_value():
return sensor.value()
if input_name in ["Crash Sensor", "Knock Sensor", "Photo Interrupter"]:
sensor = Pin(28, Pin.IN, Pin.PULL_UP)
elif input_name in ["Motion Sensor", "Touch Sensor"]:
sensor = Pin(28, Pin.IN)
elif input_name in ["Microphone Sensor", "Photoresistor", "Potentiometer"]:
from value_filter import ValueFilter
sensor = ADC(Pin(28))
value_filter = ValueFilter(filter="SMA")
value_max = 65535
def input_value(): return value_filter.update(sensor.read_u16())
elif input_name == "Accelerometer":
from adxl345 import ADXL345
from math import atan2, sqrt, degrees
accel = ADXL345(SoftI2C(sda=Pin(6), scl=Pin(7)))
value_max = 360
def input_value():
x, y, z = accel.read()
return 180 + degrees(atan2(y, z))
elif input_name == "Buttons":
buttons = []
for i in range(len(buzzer.notes)): buttons.append(Pin(i, Pin.IN, Pin.PULL_UP))
value_max = 5
def input_value():
button_value = value
for i in range(len(buzzer.notes)):
if buttons[i].value() == 0:
button_value = i
return button_value
elif input_name == "Distance Sensor":
from hcsr04 import HCSR04
sensor = HCSR04(trigger_pin=19, echo_pin=18)
value_min = 4
value_max = 40
elif input_name == "Joystick":
from joystick import Joystick
joystick = Joystick(PinX=27, PinY=26, PinButton=17)
value_min = -100
value_max = 100
def input_value(): return joystick.x
elif input_name == "Rotary Encoder":
from rotary_encoder import RotaryEncoder
sensor = RotaryEncoder(sw_pin=22, dt_pin=21, clk_pin=20, min_val=0, max_val=255)
value_max = 255
# Main loop
try:
while True:
# Read input value
value = input_value()
# Interpolate value to output variables
red = interpolate(value, value_min, value_max, 255, 0)
green = interpolate(value, value_min, value_max, 0, 255)
angle = interpolate(value, value_min, value_max, 0, 180)
freq = interpolate(value, value_min, value_max, 100, 1000) if value > value_min and value_max > 1 else 0
# Update all outputs
servo.set_angle(angle)
rgbled.set_color(r=red, g=green)
oled.print(f"Value: {value:0.0f}", f"Angle: {angle:0.0f}", f"Freq: {freq:0.0f}", f"Color: {rgbled.hex}")
buzzer.play_tone(freq)
except KeyboardInterrupt:
print("\nInterrupted by user!")
finally:
# Reset outputs
oled.reset()
rgbled.reset()
buzzer.reset()
servo.reset()