python ESP32 连接4x4矩阵按键值获取

前言

4X4矩阵键盘应用

代码

Python

代码如下）：

#创建按键对象	列			行
#Key = KEY(C1,C2,C3,C4,R1,R2,R3,R4)
#接收按键值
#temp = Key.matrix()

from machine import Pin
import time

code = [
        ['1','2','3','a'],
        ['4','5','6','b'],
        ['7','8','9','c'],
        ['*','0','#','d'],
        ]

class KEY(object):

    def __init__(self,C1,C2,C3,C4,R1,R2,R3,R4):
        
        self.C1 = C1 
        self.C2 = C2
        self.C3 = C3
        self.C4 = C4
        
        self.R1 = R1 
        self.R2 = R2 
        self.R3 = R3 
        self.R4 = R4 
  
    #按键扫描函数
    def matrix(self):
        
        #行
        R1 = Pin(self.R1,Pin.OUT)
        R2 = Pin(self.R2,Pin.OUT)
        R3 = Pin(self.R3,Pin.OUT)
        R4 = Pin(self.R4,Pin.OUT)
         
        #列
        C1 = Pin(self.C1,Pin.IN,Pin.PULL_UP)
        C2 = Pin(self.C2,Pin.IN,Pin.PULL_UP)
        C3 = Pin(self.C3,Pin.IN,Pin.PULL_UP)
        C4 = Pin(self.C4,Pin.IN,Pin.PULL_UP)

        key = 'None'

        #设置第一行拉低
        [R1.value(0),R2.value(1),R3.value(1),R4.value(1)]
        #扫描每一列键值
        if(C1.value() == 0 or C2.value() == 0 or C3.value() == 0 or C4.value() == 0):
            
            time.sleep(0.020)
            
            if C1.value() == 0:                
                key = code[0][0]
                while not C1.value():
                    pass
                    
            elif C2.value() == 0:
                key = code[0][1]
                while not C2.value():
                    pass
                
            elif C3.value() == 0:
                key = code[0][2]
                while not C3.value():
                    pass
                
            elif C4.value() == 0:
                key = code[0][3]
                while not C4.value():
                    pass
            else:
                R1.value(1)
        
        #设置第二行拉低
        [R1.value(1),R2.value(0),R3.value(1),R4.value(1)]
        #扫描每一列键值
        if(C1.value() == 0 or C2.value() == 0 or C3.value() == 0 or C4.value() == 0):
            
            time.sleep(0.020)
            
            if C1.value() == 0:                
                key = code[1][0]
                while not C1.value():
                    pass
                    
            elif C2.value() == 0:
                key = code[1][1]
                while not C2.value():
                    pass
                
            elif C3.value() == 0:
                key = code[1][2]
                while not C3.value():
                    pass
                
            elif C4.value() == 0:
                key = code[1][3]
                while not C4.value():
                    pass
            else:
                R2.value(1)
                 
        #设置第三行拉低
        [R1.value(1),R2.value(1),R3.value(0),R4.value(1)]
        #扫描每一列键值
        if(C1.value() == 0 or C2.value() == 0 or C3.value() == 0 or C4.value() == 0):
            
            time.sleep(0.020)
            
            if C1.value() == 0:                
                key = code[2][0]
                while not C1.value():
                    pass
                    
            elif C2.value() == 0:
                key = code[2][1]
                while not C2.value():
                    pass
                
            elif C3.value() == 0:
                key = code[2][2]
                while not C3.value():
                    pass
                
            elif C4.value() == 0:
                key = code[2][3]
                while not C4.value():
                    pass
            else:
                R3.value(1)
                 
        #设置第四行拉低
        [R1.value(1),R2.value(1),R3.value(1),R4.value(0)]
        #扫描每一列键值
        if(C1.value() == 0 or C2.value() == 0 or C3.value() == 0 or C4.value() == 0):
            
            time.sleep(0.020)
            
            if C1.value() == 0:                
                key = code[3][0]
                while not C1.value():
                    pass
                    
            elif C2.value() == 0:
                key = code[3][1]
                while not C2.value():
                    pass
                
            elif C3.value() == 0:
                key = code[3][2]
                while not C3.value():
                    pass
                
            elif C4.value() == 0:
                key = code[3][3]
                while not C4.value():
                    pass
            else:
                R4.value(1)
                 
   
        return key
        #返回的的是字符串类型