import time
from machine import Pin, ADC, PWM

# Analog input (e.g. potentiometer)
adc = ADC(Pin(26))

print('start')

rows = 10
row = 0
with open('data.csv', 'w') as data_file:

    while True:
        value = adc.read_u16() / 2**16

        serialized = f"{value:.2}\n"
        data_file.write(serialized)

        print("row", serialized)
        time.sleep(1.0)
        row += 1
    
        if row >= rows:
            break

# Just show what we got
print("collected data")
with open('data.csv', 'r') as read_file:
    print(read_file.read())