参考：用树莓派玩传感器
作者：LEO-max
发布时间： 2021-02-24 16:30:46
网址：https://blog.csdn.net/zouchengzhi1021/article/details/114026649?spm=1001.2014.3001.5502
目录
- 接线
- 红外避障传感器
- 声音传感器
- 火焰传感器
- 烟雾传感器
- 超声波测距传感器
接线
VCC -> 1针脚
OUT -> 40针脚
GND -> 6针脚
红外避障传感器
C语言代码：
#include <wiringPi.h>
#include <stdio.h>
#include <sys/time.h>#define AVOID 29int main(void)
{if (wiringPiSetup() == -1){printf("setup wiringPi failed !");return 1;}pinMode(AVOID, INPUT);while (1){if (digitalRead(AVOID) == 0){printf("阻挡\n");delay(500);}}return 0;
}
Python代码：
import RPi.GPIO as GPIO
import os
import timeGPIO.setmode(GPIO.BCM) #使用BCM编码方式GPIO_OUT = 21GPIO.setup(GPIO_OUT,GPIO.IN)while True:if GPIO.input(GPIO_OUT)==0: #当有障碍物时，传感器输出低电平，所以检测低电平print("There has a barrier")time.sleep(1)# exit(-1)#else:#print("OK")#time.usleep(1000)GPIO.cleanup()
声音传感器
声音传感器需要调一下电阻来调节传感器对声音的灵敏度
C语言：
#include <stdio.h>
#include <wiringPi.h>#define PCF 29int main (void)
{int value;int count = 0;wiringPiSetup ();pinMode(PCF,INPUT);while(1) {if (digitalRead(PCF) != 0){printf("Voice In!! \n");delay(500);}else{printf("ok\n");delay(500);} } return 0;
}
Python：
#!/usr/bin/python
# encoding:utf-8
import RPi.GPIO as GPIO
import timeGPIO.setmode(GPIO.BCM)
pin_voice=21
GPIO.setup(pin_voice, GPIO.IN)
try:while True:status = GPIO.input(pin_voice)if status == True:print('检测到声音')else:print('正常')time.sleep(0.5)
except KeyboradInterrupt:GPIO.cleanup()
配合电灯程序来实现吹灭LED灯操作：
#include <stdio.h>
#include <wiringPi.h>#define PCF 29
#define LED 9int main (void)
{int value;int count = 0;wiringPiSetup ();// Setup pcf8591 on base pin 120, and address 0x48pinMode(PCF,INPUT);while(1) // loop forever{if (digitalRead(PCF) != 0){printf("Voice In!! \n");digitalWrite(LED,LOW); //低电平灭return 0;}else{printf("ok\n");digitalWrite(8,HIGH); //高电平亮delay(500);}}return 0;
}
火焰传感器
Python代码:
#!/usr/bin/python
# encoding:utf-8
import RPi.GPIO as GPIO
import timepin_fire=21
GPIO.setmode(GPIO.BCM)
GPIO.setup(pin_fire, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
try:while True:status = GPIO.input(pin_fire)if status == True:print('检测到火')else:print('未检测到火')time.sleep(0.5)
except KeyboradInterrupt:GPIO.cleanup()
C语言：
#include <stdio.h>
#include <wiringPi.h>#define PCF 29int main (void)
{wiringPiSetup ();// Setup pcf8591 on base pin 120, and address 0x48pinMode(PCF,INPUT);while(1) // loop forever{if (digitalRead(PCF) != 0){printf("检测到火\n");delay(500);}else{printf("无火\n");delay(500);}}return 0;
}
烟雾传感器
#!/usr/bin/python
# encoding:utf-8
import RPi.GPIO as GPIO
import timepin_fire=21
GPIO.setmode(GPIO.BCM)
GPIO.setup(pin_fire, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
try:while True:status = GPIO.input(pin_fire)if status == True:print('没有检测到烟雾')else:print('检测到有烟雾')time.sleep(0.5)
except KeyboradInterrupt:GPIO.cleanup()
超声波测距传感器
#include <wiringPi.h>
#include <stdio.h>
#include <sys/time.h>#define Trig 29
#define Echo 28void ultraInit(void)
{pinMode(Echo, INPUT);pinMode(Trig, OUTPUT);
}float disMeasure(void)
{struct timeval tv1;struct timeval tv2;long time1, time2;float dis;digitalWrite(Trig, LOW);delayMicroseconds(2);digitalWrite(Trig, HIGH);delayMicroseconds(10); //发出超声波脉冲digitalWrite(Trig, LOW);while(!(digitalRead(Echo) == 1));gettimeofday(&tv1, NULL); //获取当前时间while(!(digitalRead(Echo) == 0));gettimeofday(&tv2, NULL); //获取当前时间time1 = tv1.tv_sec * 1000000 + tv1.tv_usec; //微秒级的时间time2 = tv2.tv_sec * 1000000 + tv2.tv_usec;dis = (float)(time2 - time1) / 1000000 * 34000 / 2; //求出距离
