openmv超声波测距

[SidneyLove]

之前看到的一份帖子，里面的程序运行时有bug，没有得到解决，有大神能解决吗？？ import time, utime, pyb from pyb import Pin wave_echo_pin = Pin('P7', Pin.IN, Pin.PULL_NONE) wave_trig_pin = Pin('P8', Pin.OUT_PP, Pin.PULL_DOWN) wave_distance = 0 tim_counter = 0 flag_wave = 0 #超声波启动 def wave_start(): wave_trig_pin.value(1) utime.sleep_us(15) wave_trig_pin.value(0) #超声波距离计算 def wave_distance_calculation(): #全局变量声明 global tim_counter #频率f为0.2MHZ 高电平时间t=计数值*1/f wave_distance = tim_counter*5*0.017 #输出最终的测量距离（单位cm） print('wave_distance',wave_distance) #超声波数据处理 def wave_distance_process(): global flag_wave if(flag_wave == 0): wave_start() if(flag_wave == 2): wave_distance_calculation() flag_wave = 0 #配置定时器 tim =pyb.Timer(1, prescaler=720, period=65535) #相当于freq=0.2M #外部中断配置 def callback(line): global flag_wave,tim_counter #上升沿触发处理 if(wave_echo_pin.value()): tim.init(prescaler=720, period=65535) flag_wave = 1 #下降沿 else: tim.deinit() tim_counter = tim.counter() tim.counter(0) extint.disable() flag_wave = 2 #中断配置 Extin=pyb.ExtInt(wave_echo_pin, pyb.ExtInt.IRQ_RISING_FALLING, pyb.Pin.PULL_DOWN, callback) while(True): wave_distance_process() time.sleep(100)

[雪水半中庭]

更改后亲测可用，因为源文本并没有再次启动中断所以只能输出一次 但还是有一个问题，openmv不能输出5v电压，所以超声波模块的供电还是需要飞控板。 import time,utime,pyb from pyb import Pin wave_echo_pin = Pin('P7', Pin.IN, Pin.PULL_NONE) wave_trig_pin = Pin('P8', Pin.OUT_PP, Pin.PULL_DOWN) wave_distance = 0 tim_counter = 0 flag_wave = 0 #超声波启动 def wave_start(): wave_trig_pin.value(True) utime.sleep_us(20) wave_trig_pin.value(0) #超声波距离计算 def wave_distance_calculation(): #全局变量声明 global tim_counter #频率f为0.2MHZ 高电平时间t=计数值*1/f wave_distance = tim_counter*5*0.017 #输出最终的测量距离（单位cm） print('wave_distance',wave_distance) #超声波数据处理 def wave_distance_process(): global flag_wave if(flag_wave == 0): wave_start() if(flag_wave == 2): wave_distance_calculation() #print("2") flag_wave = 0 extint.enable() #配置定时器 tim =pyb.Timer(4, prescaler=720, period=65535) #相当于freq=0.2M #外部中断配置 def callback(line): global flag_wave,tim_counter #上升沿触发处理 if(wave_echo_pin.value()): tim.init(prescaler=720, period=65535) flag_wave = 1 #下降沿 else: tim.deinit() tim_counter = tim.counter() extint.disable() flag_wave = 2 #中断配置 extint = pyb.ExtInt(wave_echo_pin, pyb.ExtInt.IRQ_RISING_FALLING, pyb.Pin.PULL_DOWN, callback) while(True): wave_distance_process() time.sleep(100)

[雪水半中庭]

记住记住！供电要5v，否则上述的程序，还是没有任何的显示！！！！！！！接地也需要共地的！