扩展16*16矩阵键盘
时间: 2023-12-31 08:06:49 浏览: 114
根据提供的引用内容,扩展16x16矩阵键盘可以使用多片74HC595和74HC165芯片来实现。以下是一个简单的示例:
1. 使用74HC595扩展输出IO:
```python
import RPi.GPIO as GPIO
import time
# 定义74HC595芯片的引脚
data_pin = 17
clock_pin = 18
latch_pin = 27
# 初始化GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(data_pin, GPIO.OUT)
GPIO.setup(clock_pin, GPIO.OUT)
GPIO.setup(latch_pin, GPIO.OUT)
# 定义要输出的数据
data = [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]
# 输出数据到74HC595芯片
def shift_out(data):
GPIO.output(latch_pin, GPIO.LOW)
for i in range(8):
GPIO.output(clock_pin, GPIO.LOW)
GPIO.output(data_pin, (data >> i) & 0x01)
GPIO.output(clock_pin, GPIO.HIGH)
GPIO.output(latch_pin, GPIO.HIGH)
# 循环输出数据
while True:
for i in range(16):
# 设置要输出的数据
data[i] = 0xFF
data[i+8] = 0x00
# 输出数据到74HC595芯片
shift_out(data[i])
shift_out(data[i+8])
# 延时一段时间
time.sleep(0.1)
```
2. 使用74HC165扩展输入IO:
```python
import RPi.GPIO as GPIO
import time
# 定义74HC165芯片的引脚
data_pin = 17
clock_pin = 18
latch_pin = 27
# 初始化GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(data_pin, GPIO.IN)
GPIO.setup(clock_pin, GPIO.OUT)
GPIO.setup(latch_pin, GPIO.OUT)
# 读取数据从74HC165芯片
def shift_in():
GPIO.output(latch_pin, GPIO.HIGH)
GPIO.output(clock_pin, GPIO.LOW)
GPIO.output(latch_pin, GPIO.LOW)
GPIO.output(clock_pin, GPIO.HIGH)
data = 0
for i in range(8):
data = (data << 1) | GPIO.input(data_pin)
GPIO.output(clock_pin, GPIO.LOW)
GPIO.output(clock_pin, GPIO.HIGH)
return data
# 循环读取数据
while True:
for i in range(16):
# 读取数据从74HC165芯片
data = shift_in()
# 处理数据
if data == 0x00:
print("按键被按下:第{}行,第{}列".format(i // 8, i % 8))
# 延时一段时间
time.sleep(0.1)
```
请注意,以上示例代码仅为演示目的,实际使用时需要根据具体的硬件连接和引脚配置进行调整。