Skip to content

Lab 2: Testing the Potentiometer

Short Version

In this version, we keep the code to a minimum.

1
2
3
4
5
6
from machine import Pin, ADC
from utime import sleep
pot = ADC(Pin(26))
while True:
    print(pot.read_u16())
    sleep(0.1)

Configuration File

config.py 

1
POTENTIOMETER_PIN = 26

Full Version

test-pot.py 

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
from machine import Pin, ADC
import config
from utime import sleep

# Get the potentiometer pin from config
POTENTIOMETER_PIN = config.POTENTIOMETER_PIN

# Create an ADC object for the potentiometer
potentiometer = ADC(Pin(POTENTIOMETER_PIN))

# MicroPython ADC has 16-bit resolution (0-65535)
max_value = 65535

print("Potentiometer Value Reader")
print("Press Ctrl+C to exit")
print("-----------------------")

try:
    while True:
        # Read the raw ADC value
        raw_value = potentiometer.read_u16()

        # Calculate percentage (0-100%)
        percentage = round((raw_value / max_value) * 100)

        # Calculate voltage (assuming 3.3V reference)
        voltage = (raw_value / max_value) * 3.3

        # Print the values
        print(f"Raw ADC: {raw_value}, Percentage: {percentage}%, Voltage: {voltage:.2f}V")

        # Sleep to avoid flooding the console
        sleep(0.1)

except KeyboardInterrupt:
    print("\nProgram stopped by user")