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ADC

The ADC sample demonstrates using the analogio module to measure the voltage of the A0 pin.

Requirements

Before you start, check that you have the required hardware and software:

Running the code

To run the code, complete the following steps:

  1. Connect iMX RT1011 Nano Kit to your computer using the USB-C Cable.
  2. Start Mu Editor, click Load to open code.py in the CIRCUITPY drive.

  3. Copy and paste the following code into code.py and click Save:

    CIRCUITPY/code.py
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    import time
import board
from analogio import AnalogIn

# Analog In 
analog_in = AnalogIn(board.A0)

# Convert ADC value to voltage in mV
def get_voltage(ain):
    return (ain.value * 3300) / 65536

while True:
    print((get_voltage(analog_in),))
    time.sleep(0.1)

  4. Your code will run as soon as the file is done saving. Click Serial on Mu Editor's Top Menu to open a serial console. You should see the console output, similar to what is shown in the following:

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    Code stopped by auto-reload. Reloading soon.

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
(30.6152,)
(32.2266,)
(33.0322,)
(32.2266,)
(31.4209,)
(30.6152,)
(29.8096,)
(31.4209,)
(32.2266,)
(33.0322,)
...

  5. You can also use the plotter for data inspection. Click Plotter on Mu Editor's Top Menu to open up a plotter pane: