Datasheet

Creating an Analog Input

analogin = AnalogIn(board.A1) Creates an object named 'analogin' which is connected to the A1 pad on the Circuit

Playground Express.

GetVoltage Helper

getVoltage(pin) is our little helper program. By default, analog readings will range from 0 (minimum) to 65535

(maximum). This helper will convert the 0-65535 reading from pin.value and convert it a 0-3.3V voltage reading.

Main Loop

The main loop is simple, it will just print out the voltage as a floating point value (the %f indicates to print as floating

point) by calling getVoltage on each of our analog object, in this case the potentiometer.

If you connect to the serial port REPL, you'll see the voltage printed out. Try turning the knob of the potentiometer to

see the voltage change!

# CircuitPlaygroundExpress_AnalogIn

# reads the analog voltage level from a 10k potentiometer

# connected to GND, 3.3V, and pin A1

# and prints the results to the REPL

import time

import board

from analogio import AnalogIn

analogin = AnalogIn(board.A1)

def getVoltage(pin): # helper

return (pin.value * 3.3) / 65536

while True:

print("Analog Voltage: %f" % getVoltage(analogin))

time.sleep(0.1)

You can use many of different kinds of external analog sensors connected to the Analog IO pads, such as

distance sensors, flex sensors, and more!!