【正文】 的基礎(chǔ)上進(jìn)行放大的信號的作用，類似與三極管的放大效果。 圖 4 紅外線報警器原理圖 以下是基于單片機(jī)控制紅外線報警器的程序 include include include include include include define uchar unsigned char define uint unsigned int 8 sbit OUT=P2^2。 uchar bInt0 = 0。 uchar t,set。 bit write=0。 bit flag2。 //控制蜂鳴器報警 uchar code str0[]={ system running }。 uchar code str2[]={wrong SA: . C}。 void displayfun1(void)。 void WriteOneChar(unsigned char dat)。 void playalarm(void)。 DisplayListChar(0,0,str0)。 DisplayOneChar(11,1,temp1/10+0x30)。 DisplayOneChar(14,1,temp2/10+0x30)。 displayfun1()。 } else { DisplayListChar(0,1,str2)。 delay_LCM(1000)。 TH1=0x3c。 EA=1。 10 //TR1=1。 TL1=0xb0。 OUT = 1。 if(mstt==400) //蜂鳴器響 10 秒 {mstt=0。 TR0 = 1。 //停止報警，進(jìn)入正常模式 TR1_flag = 0。 } } /***********the main funtion*************/ void main(void) { int_mcu()。 // initialize p1 delay_LCM(500)。 //initialize LCD init_timer1( )。 //initialize Ds18b20 DisplayListChar(0,0,str0)。 基于單片機(jī)控制的紅外報警器設(shè)計 11 //out_high()。 while (1) { //TR0 = 1。 TR0 = 1。 ReadTemperature()。 //for(m=0。m++) //讀取 P32 狀態(tài) 8 次，若有高電平則報警 // { if(P32) { delay_LCM(50)。 flag2 = 1。 } } else {delay_LCM(100)。//關(guān)定時器 0，停止發(fā)送脈沖 TR1 = 1。 12 flag2 = 0。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。s performers of the troupe still tour the region39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has bined contemporary musical elements with folk songs of the region. Haimu, a 25yearold khoomei (a local variant of overtone singing) singer, joined the troupe three years ago. Along with a sixmember band, he performs fast songs and soft ones that he writes－ all while playing the horsehead fiddle.Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk music of Inner Mongolia is the root, he says. Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled. The first round of spring auction season in Beijing ended last week, but it failed to create much spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sa le rate showed a downturn this year. In the ―Grand View: Chinese Painting Highlight‖ session at China Guardian 2021 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched million yuan, an unexpected high in recent years. However, the trading volume fells to billion yuan from billion yuan in the same period the year before. The Huangchen 2021 Spring Auctions, which recorded million yuan in total sales, experienced the same. The section number went down to 5 from 12 pared to last year. According to expert Shao Jianwu, the art market did not attract mu