linux脚本实现微波检测

脚本中监测微波模块，做一个活体监测，人来人走发出来一个广播给应用，其原理就是微波模块在有人跟我人的时候会输出一个高地电平，系统就是靠检测这个高地电平来实现检测功能。代码如下：

check_gpio()
{

let time_cnt++

#if [ $time_cnt -ge  2 ]; then
    time_cnt=0
	
	val=`cat /proc/yx_gpio/gpio_io1`
	log gpio1 value===$val
	
	if [ $val == 0 ]; then
		come_cnt=0
		let gone_cnt++
		if [ $gone_cnt -eq 2 ]; then
			if [ $relock_falg -eq 0 ]; then
				log fan people is gone
				am broadcast -a  com.yx.action.PEOPLE_GONE_AWAY
				relock_falg=1
			else
			continue
			fi
		fi	
	else
		gone_cnt=0
		let come_cnt++
		if [ $come_cnt -eq 2 ]; then
			if [ $relock_falg -eq 1 ]; then
				relock_falg=0
				log fan people is coming
				am broadcast -a  com.yx.action.PEOPLE_COME_BACK
			else
				continue
			fi

		fi
	fi
	

}
gone_cnt=0
come_cnt=0
relock_falg=0

while true
do

	check_gpio

done