phyduino/03_analog/analog_in_out_serial/main.py

Reads a potentiometer on A0, sets the on-board LED's brightness from it with PWM, and prints both numbers.

Wiring

A potentiometer wiper on A0, with its ends on GND and 3.3 V.

Output

sensor = 2048   output = 32775

# Reads a potentiometer on A0, sets the on-board LED's brightness from it with
# PWM, and prints both numbers.
#
# Connect a potentiometer wiper to A0, with its ends on GND and 3.3 V.
 
import time  # sleep_ms() for pauses
 
import phyduino as mcu  # the Phyduino Pico library, used as mcu.<name>
 
led = mcu.pwm("LED")  # Puts the LED's pin into PWM mode and saves the control variable to the 'led' variable.
 
while True:  # repeats until stopped: Interrupt in PyCharm, or mpremote soft-reset
    sensor = mcu.analog_read("A0")  # 0 (0 V) to 4095 (3.3 V)
    output = sensor * 65535 // 4095  # scale to 0-65535 for duty_u16()
    led.duty_u16(output)  # brighter as the voltage rises
    print("sensor =", sensor, "  output =", output)
    time.sleep_ms(2)  # a short pause between readings