Adafruit 16x2显示屏，键盘不工作，接受RasPi B+3上的按钮输入

Question

我目前正在做一个学校项目，使用RasPi B+3和Adafruit 16x2带键盘的显示器

我用这些来显示两名球员的名字和分数，他们在空中曲棍球桌上打球。必须使用5个按钮（向上、向下、向右、向左、选择）输入姓名的用户。向上和向下控制字符：如果按下向上键，则将A更改为B，如果再次按下，则将B更改为C。如果按下向下键，则将C更改为B，如果再次按下，则将B更改为A。左右键用于控制要更改的角色的位置：如果按“左”键，则向左移动角色；如果按“右”键，则向右移动角色

我遇到的问题是，上述选项似乎都不起作用，LCD只有在代码启动时才会亮起，但LCD上不会出现任何字符

有人知道问题出在哪里吗

我在用Python3

这是我的代码：

import time
import Adafruit_CharLCD as LCD


# Initialize the LCD using the pins
lcd = LCD.Adafruit_CharLCDPlate()

button_1 = (LCD.SELECT, 'Select', (1,1,1))
button_2 = (LCD.LEFT,   'Left'  , (1,0,0))
button_3 = (LCD.UP,     'Up'    , (1,0,1))
button_4 = (LCD.DOWN,   'Down'  , (1,1,0))
button_5 = (LCD.RIGHT,  'Right' , (1,0,1))

while cycle == true:
    x = 65
    y = 65
    part = 1
    while True:
#Part 1
#This part is for the name of player1
    if part == 1:
        if lcd.is_pressed(button_1):
            part += 1
            #To continue to part2
        if lcd.is_pressed(button_3):

            lcd.noblink
            x += 1
            cc=ord(x)
            x_2 = cc

            if x_2 > 90:
                x_2 -= 25
            #For moving from Z to A
            lcd.message(char(x_2))
            #moving the characters up 1 (A, B, C....)
        if lcd.is_pressed(button_4):

            lcd.noblink
            x -= 1
            cc=ord(x)
            x_2 = cc

            if x_2 < 65:
                x_2 += 25

                #For moving from A to Z
            lcd.message(char(x_2))
        #moving the characters down 1 Z, X, Y....)
        if lcd.is_pressed(button_2):
            remove(x_2)
            lcd.move_left
            x = 65
            #moving the editable character to the left
        if lcd.is_pressed(button_5):
            append(x_2)
            lcd.move_right
            x = 65

            #moving the editable character to the right
#Part 2
#This part is for the name of player2           
    if part == 2:
        if lcd.is_pressed(button_1):
            part += 1
            #To continue to the next part (visualis the names)
        if lcd.is_pressed(button_3):

            lcd.noblink
            y += 1
            cc=ord(y)
            y_2 = cc

            if y_2 > 90:
                y_2 -= 25
                #For moving from Z to A
            lcd.message(char(y_2))
            #moving the characters up 1 (A, B, C....)
        if lcd.is_pressed(button_4):

            lcd.noblink
            y -= 1
            cc=ord(y)
            y_2 = cc

            if y_2 < 65:
                y_2 += 25
                #For moving from A to Z 
            lcd.message(char(y_2))
            #moving the characters down 1 (Z, X, Y....)
        if lcd.is_pressed(button_2):
            remove(y_2)
            lcd.move_left
            y = 65
            #moving the editable character to the left 
        if lcd.is_pressed(button_5):
            append(y_2)
            lcd.move_right
            y = 65
            #moving the editable character to the right
#Part 3
#This part is for displaying the first 7 Characters of the names   (16/2=8  8-1=7 (this is for the spacing between the names) )
    if part == 3:
        # here must go the array to display the first and the second name