Learn CIRCUITPYTHON with Real Code Examples

import board
import digitalio

count = 0
isDark = False

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT

def updateUI():
    print(f"Counter: {count}")
    if isDark:
        led.value = True
        print("Theme: Dark")
    else:
        led.value = False
        print("Theme: Light")

def increment():
    global count
    count += 1
    updateUI()

def decrement():
    global count
    count -= 1
    updateUI()

def reset():
    global count
    count = 0
    updateUI()

def toggleTheme():
    global isDark
    isDark = not isDark
    updateUI()

# Simulate actions
updateUI()
increment()
increment()
toggleTheme()
decrement()
reset()

Demonstrates a simple counter with theme toggling using CircuitPython variables and microcontroller GPIO control (LED indicator).

import random

def readTemp():
    return random.randint(20,35)  # Simulated sensor

temp = readTemp()
print(f"Temperature: {temp}")
if temp > 30:
    print("Warning: High Temperature!")

Reads temperature from a sensor and prints alerts.

presses = 0

def buttonPressed():
    global presses
    presses += 1
    print(f"Button pressed: {presses}")

buttonPressed()
buttonPressed()
buttonPressed()

Counts the number of button presses and prints the count.

import time
import board
import digitalio

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT

for i in range(3):
    led.value = True
    print("LED ON")
    time.sleep(0.5)
    led.value = False
    print("LED OFF")
    time.sleep(0.5)

Blinks an LED on and off three times.

import random
import board
import digitalio

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT
lightLevel = random.randint(0,100)
if lightLevel < 50:
    led.value = True
    print("LED ON")
else:
    led.value = False
    print("LED OFF")
print(f"Light Level: {lightLevel}")

Monitors light sensor and turns on LED if it is dark.

import random
sensorValue = random.randint(50,150)
if sensorValue > 100:
    print("Buzzer ON")
else:
    print("Buzzer OFF")
print(f"Sensor: {sensorValue}")

Activates buzzer if a threshold value is exceeded.

motorActive = True
if motorActive:
    print("Motor ON")
else:
    print("Motor OFF")
motorActive = False
if motorActive:
    print("Motor ON")
else:
    print("Motor OFF")

Starts and stops a motor based on a condition.

import random
distance = random.randint(5,20)
if distance < 10:
    print("Alert: Object too close!")
print(f"Distance: {distance}")

Reads a distance sensor and prints alerts if object is too close.

import random
humidity = random.randint(20,80)
if humidity < 30:
    print("Too Dry!")
if humidity > 70:
    print("Too Humid!")
print(f"Humidity: {humidity}")

Monitors humidity and prints if it is too high or low.

import random
import board
import digitalio
led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT
temp = random.randint(25,35)
light = random.randint(0,100)
if temp>30 or light<50:
    led.value=True
    print("LED ON")
else:
    led.value=False
    print("LED OFF")
print(f"Temp: {temp}, Light: {light}")

Reads multiple sensors and updates LED/buzzer accordingly.