蓝桥杯板子使用PCA模块配置3米超声波代码
时间: 2023-11-28 19:50:07 浏览: 186
以下是一个使用PCA模块配置3米超声波的蓝桥杯板子代码示例:
``` python
import PCA9685 # 导入PCA9685驱动模块
import time
# 定义舵机引脚
SERVO_PIN = 0
# 定义超声波引脚
TRIG_PIN = 17
ECHO_PIN = 27
# 初始化PCA9685模块
pwm = PCA9685.PCA9685()
pwm.set_pwm_freq(50) # 设置PWM频率为50Hz
# 初始化GPIO模块
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(TRIG_PIN, GPIO.OUT)
GPIO.setup(ECHO_PIN, GPIO.IN)
# 发送超声波信号并返回距离
def get_distance():
GPIO.output(TRIG_PIN, GPIO.HIGH)
time.sleep(0.00001)
GPIO.output(TRIG_PIN, GPIO.LOW)
while not GPIO.input(ECHO_PIN):
pass
start_time = time.time()
while GPIO.input(ECHO_PIN):
pass
end_time = time.time()
distance = (end_time - start_time) * 340 / 2
return distance
# 控制舵机旋转到指定角度
def set_servo_angle(angle):
duty_cycle = angle * 4096 / 180 # 计算占空比
pwm.set_pwm(SERVO_PIN, 0, int(duty_cycle)) # 设置舵机PWM信号
# 主函数
if __name__ == '__main__':
try:
while True:
distance = get_distance() # 获取距离
if distance > 300: # 超出测量范围
print('Out of range')
else:
angle = 180 - distance * 60 / 300 # 计算舵机旋转角度
set_servo_angle(angle) # 控制舵机旋转
print('Distance: %dcm, Angle: %d' % (distance, angle))
time.sleep(0.1)
except KeyboardInterrupt:
pass
finally:
pwm.cleanup() # 清理PCA9685模块
GPIO.cleanup() # 清理GPIO模块
```
在该示例代码中,我们首先导入了PCA9685驱动模块,并初始化了一个PCA9685对象。然后,我们定义了超声波引脚和舵机引脚,并初始化了GPIO模块。接着,我们定义了两个函数:get_distance()用于发送超声波信号并返回距离,set_servo_angle()用于控制舵机旋转到指定角度。最后,在主函数中,我们不断调用get_distance()函数获取距离,并根据距离计算舵机旋转角度,再调用set_servo_angle()函数控制舵机旋转到指定角度。
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