1.Digital Output(GPIO)

Description

The output can be controlled by setting the specified IO pin to output a high level (3.3V) or a low level (0V).

Common functions

The following two functions can achieve the same effect.

1.1 Pin( )

Syntax	PinObject = Pin(Pin.num, Pin.OUT)
Description	Set the specified pin to OUT mode.
Parameters	Pin.num: Pin number.
	Pin.OUT: OUT mode.
Return	Pin object

1.2 write_digital( )

Syntax	PinObject.write_digital(v)
Description	Output digital level
Parameters	v: 0 or 1, 1 indicates high-level output (3.3V), 0 indicates low-level output (0V).
Return	**None

1.3 value( )

Syntax	PinObject.value(v)
Description	Output digital level.
Parameters	v: 0 or 1, 1 indicates high-level output (3.3V), 0 indicates low-level output (0V).
Return	**None

Example Description

Below is a sample code using the PinPong Library to control an LED and print corresponding messages when the LED is turned on or off. This code allows for the changes in the output level of GPIO pins to be felt through the on/off of LED lights.

Hardware Required

• UNIHIKER
• Gravity: Digital Piranha LED Module - Red

Example Code

# -*- coding: UTF-8 -*-

import time
from pinpong.board import Board, Pin

Board().begin() # Initialize the UNIHIKER

led = Pin(Pin.P21, Pin.OUT) # Set Pin P21 as an output pin for the LED

while True:
    # led.value(1)  # The second method
    led.write_digital(1) # Turn on the LED by setting the pin value to high
    print("The LED light is on") # Display a message indicating that the LED light is on 
    time.sleep(1)  # Pause the program for 1 second
    # led.value(0)  # The second method
    led.write_digital(0) # Turn off the LED by setting the pin value to low
    print("The LED light is off")  # Display a message indicating that the LED light is off
    time.sleep(1) # Pause the program for 1 second

Program Effect:

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