树莓派Python矩阵键盘
时间: 2023-06-29 10:18:25 浏览: 311
您好!针对您的问题,可以使用树莓派和Python来控制矩阵键盘。具体的步骤如下:
1. 首先,需要连接好矩阵键盘和树莓派,可以参考相关的连接教程。
2. 接下来,在树莓派上安装相关的Python库,如RPi.GPIO和Adafruit_Python_MCP230xx等。
3. 然后,使用GPIO库和MCP230xx库来控制矩阵键盘。可以通过GPIO库来读取行引脚的状态,通过MCP230xx库来设置列引脚的状态。具体的代码可以参考如下:
```python
import RPi.GPIO as GPIO
import Adafruit_GPIO.MCP230xx as MCP
# Set up GPIO pins
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
# Set up MCP230xx
mcp = MCP.MCP23017(0x20) # the address of MCP23017
mcp.setup(0, MCP.OUT) # set up the first column as output
mcp.pullup(1, True) # enable the pull-up resistor for the first row
# Define the key map
keys = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "*", "#", "A", "B", "C", "D"]
# Read the keypad
while True:
for i in range(len(keys)):
# Set the column pin to low
mcp.output(0, 0)
# Check the row pin
if GPIO.input(18+i) == 0:
print(keys[i])
# Set the column pin to high
mcp.output(0, 1)
```
4. 最后,可以根据需要对代码进行修改,例如添加按键事件的处理等。
希望以上信息能够对您有所帮助!
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