#!/usr/bin/python
# Circuit:
# * A Piezo is connected to pin 12 on header P8. - GPIO1_12
# * A LED is connected to pin 14 on header P8. - GPIO0_26
# * A button is connected to pin 45 on header P8. - GPIO2_6
# Use a pull-down resistor (around 10K ohms) between pin 45 and ground.
# 3.3v for the other side of the button can be taken from pins 3 or 4
# on header P9. Warning: Do not allow 5V to go into the GPIO pins.
# * GND - pin 1 or 2, header P9.
def setup(): # this function will run once, on startup
pinMode(PIEZO, OUTPUT) # set up pin 12 on header P8 as an output - Piezo
pinMode(LED, OUTPUT) # set up pin 14 on header P8 as an output - LED
pinMode(BUTTON, INPUT) # set up pin 45 on header P8 as an input - Button
def loop(): # this function will run repeatedly, until user hits CTRL+C
if (digitalRead(BUTTON) == HIGH):
# was the button pressed? (is 3.3v making it HIGH?) then do:
buzz()
delay(10) # don't "peg" the processor checking pin
def delay(j): #need to overwrite delay() otherwise, it's too slow
for k in range(1,j):
pass
def buzz(): #this is what makes the piezo buzz - a series of pulses
# the shorter the delay between HIGH and LOW, the higher the pitch
limit = 500 # change this value as needed;
# consider using a potentiometer to set the value
for j in range(1, limit):
digitalWrite(PIEZO, HIGH)
delay(j)
digitalWrite(PIEZO, LOW)
delay(j)
if j==limit/2:
digitalWrite(LED, HIGH)
digitalWrite(LED, LOW) # turn it off
run(setup, loop)
这就是我如何使用Python和PyBBIO在Beaglebone上解决这个问题的方法:
AM3359的GPIO引脚电压低,驱动器强度不足,无法直接驱动任何类型的传感器。你需要用运算放大器,晶体管或场效应晶体管来建立一个小电路。在
一旦完成了这项工作,您只需设置一个计时器循环,以所需频率更改GPIO线路的状态。在
到目前为止,最快和最简单的方式,从这个董事会音频接口是一个USB音频接口。在
签出this page。在userland(例如python)中,您可以通过写入
/sys/class/gpio
中的正确的sysfs
文件,将pin设置为high或low。在相关问题 更多 >
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