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第 16 頁 共 18 頁 Football Association39。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經(jīng)到了尾聲。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。那些曾經(jīng)所謂的非做不可,只是青蔥年華里自己給自己注射的一支強(qiáng)心劑,或者說,是自以為是的精神寄托罷了。ll be traveling fast, so despite the distance, it will not be like 單片機(jī)項(xiàng)目實(shí)驗(yàn)報(bào)告 第 18 頁 共 18 頁 diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。突然想到那件藍(lán)格子襯衫;那些被折成各種各樣形狀的信紙;那段從街角深巷伊始的友誼;還有那場(chǎng)還沒有開始就宣告了終結(jié)的邂逅計(jì)劃 …… 那些年那些天的非做不可,終于和青春一樣,都將在我們的人生中謝幕。也曾經(jīng)好像已經(jīng)下定了決心去做某件事,但更多的時(shí)候是最后又打起了退堂鼓。t really grow up, it seems is not so important。s actions. CSKA said they were surprised and disappointed by Toure39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。 } } } void PWMA(uchar n) { if(num0n) P3_2=1。 PWMA(35)。amp。 PWMB(70)。 } if((num1c+1)amp。 num0=0。 } void trigon(uint c,uint d,uint e,uint f,uint g,uint h) { uint aa,bb,cc,dd,ee。 round(13,70)。 while(1) { jump=0。 ET1=1。 void PWMB(uchar n)。 這里我使用定時(shí)器 T0的工作模式 2自動(dòng)重裝。 單片機(jī)項(xiàng)目實(shí)驗(yàn)報(bào)告 第 7 頁 共 18 頁 、 電機(jī)模塊 電機(jī)模塊采用 4塊電機(jī)同時(shí)驅(qū)動(dòng),這里將同一側(cè)電機(jī)短接接到 L298N的一個(gè)輸出端。用 9V 的鋅電源給前、后輪電機(jī)供電,然后使用 7805 穩(wěn)壓管來把高電壓穩(wěn)成 5V 分別給單片機(jī)和電機(jī)驅(qū)動(dòng)芯片供電。通過單片機(jī)的 PWM 輸出同樣可以控制直流電機(jī)的旋轉(zhuǎn)速度,實(shí)現(xiàn)電動(dòng)車的速度控制。以 STC89C52 為控制核心,利用 按鍵的動(dòng)作 ,控制電動(dòng)小汽車的 軌跡 ??梢娖溲芯恳饬x很大。 我們?cè)O(shè)計(jì)的智能電動(dòng)小車該具有圓形運(yùn)行、三角形運(yùn)行、矩形運(yùn)行和三者一起運(yùn)行的功能 。 二、方案設(shè)計(jì)與論證 1) 控制器 模塊選取 我們采用 STC 公司的 STC89S52 單片機(jī)作為主控制器, STC 公司的單片機(jī)內(nèi)部資源比起 ATMEL 公司的單片機(jī)來要豐富的多,它 在 5V 供電情況下,最多支持 80M晶振、且內(nèi)部有 512B 的 RAM 數(shù)據(jù)存儲(chǔ)器 、 片內(nèi)含 8k 空間的可反復(fù)擦些 1000 次的 Flash 只讀存儲(chǔ)器 、 1K的 EEPROM、 8個(gè)中斷源、 4個(gè)優(yōu)先級(jí)、 3個(gè)定時(shí)器、 32 個(gè) IO 口 、 片機(jī)自帶看門狗、雙數(shù)據(jù)指針等。 L298N 為單塊集成電路,高電壓,高電流,四通道驅(qū)動(dòng),可直接的對(duì)電機(jī)進(jìn)行控制, 無須隔離電路。 系統(tǒng)結(jié)構(gòu)框圖 單片機(jī)最小系統(tǒng) L298N 按鍵 模塊 電源 模塊 電機(jī)模塊 單片機(jī)項(xiàng)目實(shí)驗(yàn)報(bào)告 第 5 頁 共 18 頁 實(shí)物連接: 單片機(jī)項(xiàng)目實(shí)驗(yàn)報(bào)告 第 6 頁 共 18 頁 、 電