print("channel:A2, value:%d" %val2)

print("channel:A3, value:%d" %val3)

'''

print("")

time.sleep(1)

The function board.get_adc_value() in the example is used to get the value of analog

port, the pin selection list is shown below:

Analog Pin of IO expansion board

Value of the parameter

0

0

1

1

2

2

3

3

All Pins

board.ALL

•

Digital: the usage of the digital ports are same with the ways to use GPIO ports of

Raspberry Pi. Download the RPi.GPIO first. Input the command on Raspberry Terminal:

sudo apt-get install rpi.gpio

Input the following command to check is the RPi.GPIO library is installed successfully:

gpio.readall

If all pins are displayed on the terminal, the library installation succeeds.

Take GPIO16 as an example. Connect a LED on P27 of the expansion board.

Input the following sample code into nano editor, input python to run the program:

# -*- coding:utf-8 -*-

# digitalTest.py