{"id":76205,"date":"2026-02-21T23:17:19","date_gmt":"2026-02-21T15:17:19","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76205.html"},"modified":"2026-02-21T23:17:19","modified_gmt":"2026-02-21T15:17:19","slug":"%e5%9f%ba%e4%ba%8estc89c52%e4%b8%8ehc-sr04%e7%9a%84%e8%b6%85%e5%a3%b0%e6%b3%a2%e6%b5%8b%e8%b7%9d%e7%b3%bb%e7%bb%9f%e8%ae%be%e8%ae%a1%e4%b8%8e%e5%ae%9e%e7%8e%b0%ef%bc%88%e9%99%84%e6%ba%90%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76205.html","title":{"rendered":"\u57fa\u4e8eSTC89C52\u4e0eHC-SR04\u7684\u8d85\u58f0\u6ce2\u6d4b\u8ddd\u7cfb\u7edf\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\uff08\u9644\u6e90\u7801\u4e0e\u5b9e\u7269\u8c03\u8bd5\uff09"},"content":{"rendered":"<h3>1. \u9879\u76ee\u6982\u8ff0\u4e0e\u8bbe\u8ba1\u601d\u8def<\/h3>\n<p>\u8d85\u58f0\u6ce2\u6d4b\u8ddd\u7cfb\u7edf\u5728\u667a\u80fd\u5c0f\u8f66\u907f\u969c\u3001\u5012\u8f66\u96f7\u8fbe\u3001\u5de5\u4e1a\u68c0\u6d4b\u7b49\u9886\u57df\u5e94\u7528\u5e7f\u6cdb\u3002\u57fa\u4e8eSTC89C52\u5355\u7247\u673a\u548cHC-SR04\u6a21\u5757\u7684\u65b9\u6848&#xff0c;\u6210\u672c\u4f4e\u3001\u6613\u4e0a\u624b&#xff0c;\u975e\u5e38\u9002\u5408\u5d4c\u5165\u5f0f\u5165\u95e8\u548c\u5feb\u901f\u5f00\u53d1\u3002\u6211\u81ea\u5df1\u505a\u8fc7\u597d\u51e0\u4e2a\u7c7b\u4f3c\u9879\u76ee&#xff0c;\u5b9e\u6d4b\u4e0b\u6765\u7a33\u5b9a\u6027\u4e0d\u9519&#xff0c;\u6d4b\u8ddd\u8303\u56f42cm\u52304\u7c73&#xff0c;\u7cbe\u5ea6\u80fd\u63a7\u5236\u57283mm\u4ee5\u5185\u3002<\/p>\n<p>\u7cfb\u7edf\u6838\u5fc3\u5de5\u4f5c\u539f\u7406\u5f88\u7b80\u5355&#xff1a;\u5355\u7247\u673a\u89e6\u53d1HC-SR04\u53d1\u5c04\u8d85\u58f0\u6ce2&#xff0c;\u8ba1\u7b97\u4ece\u53d1\u5c04\u5230\u63a5\u6536\u56de\u6ce2\u7684\u65f6\u95f4\u5dee&#xff0c;\u6839\u636e\u58f0\u901f\u6362\u7b97\u6210\u8ddd\u79bb\u3002\u4f46\u5b9e\u9645\u8c03\u8bd5\u4e2d\u4f1a\u9047\u5230\u4e0d\u5c11\u5751&#xff0c;\u6bd4\u5982\u6e29\u5ea6\u5bf9\u58f0\u901f\u7684\u5f71\u54cd\u3001\u56de\u6ce2\u4fe1\u53f7\u5904\u7406\u3001\u6d4b\u91cf\u76f2\u533a\u7b49\u95ee\u9898\u3002\u8fd9\u4e2a\u9879\u76ee\u4e0d\u4ec5\u5305\u542b\u786c\u4ef6\u7535\u8def\u8bbe\u8ba1&#xff0c;\u8fd8\u6d89\u53ca\u6e29\u5ea6\u8865\u507f\u7b97\u6cd5\u548c\u5b9e\u7269\u8c03\u8bd5\u6280\u5de7&#xff0c;\u6211\u4f1a\u628a\u8e29\u8fc7\u7684\u5751\u548c\u89e3\u51b3\u65b9\u6848\u90fd\u5206\u4eab\u51fa\u6765\u3002<\/p>\n<p>\u7cfb\u7edf\u529f\u80fd\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u5b9e\u65f6\u6d4b\u91cf\u5e76\u663e\u793a\u8ddd\u79bb&#xff08;4\u4f4d\u6570\u7801\u7ba1&#xff09;<\/li>\n<li>\u6309\u952e\u8bbe\u7f6e\u62a5\u8b66\u9608\u503c&#xff08;\u652f\u6301\u6389\u7535\u4fdd\u5b58&#xff09;<\/li>\n<li>\u8d85\u51fa\u9608\u503c\u65f6\u8702\u9e23\u5668\u62a5\u8b66<\/li>\n<li>\u6d4b\u91cf\u8bef\u5dee\u81ea\u52a8\u6821\u51c6<\/li>\n<\/ul>\n<h3>2. \u786c\u4ef6\u8bbe\u8ba1\u8be6\u89e3<\/h3>\n<h4>2.1 \u6838\u5fc3\u63a7\u5236\u5668&#xff1a;STC89C52<\/h4>\n<p>\u6211\u9009\u62e9STC89C52\u662f\u56e0\u4e3a\u5b83\u6027\u4ef7\u6bd4\u9ad8&#xff0c;\u8d44\u6e90\u8db3\u591f\u7528&#xff1a;8KB Flash\u3001512B RAM\u300132\u4e2aIO\u53e3\u30013\u4e2a\u5b9a\u65f6\u5668\u3002\u76f8\u6bd4STM32&#xff0c;51\u5355\u7247\u673a\u5bf9\u65b0\u624b\u66f4\u53cb\u597d&#xff0c;\u5bc4\u5b58\u5668\u914d\u7f6e\u7b80\u5355&#xff0c;\u4e0d\u7528\u6298\u817e\u590d\u6742\u7684\u5e93\u51fd\u6570\u3002<\/p>\n<p>\u6700\u5c0f\u7cfb\u7edf\u8bbe\u8ba1\u8981\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u6676\u632f\u7535\u8def&#xff1a;12MHz\u6676\u632f\u642d\u914d30pF\u7535\u5bb9&#xff08;\u5bb9\u503c\u592a\u5c0f\u4e0d\u6613\u8d77\u632f&#xff0c;\u592a\u5927\u4f1a\u589e\u52a0\u529f\u8017&#xff09;<\/li>\n<li>\u590d\u4f4d\u7535\u8def&#xff1a;10k\u7535\u963b&#043;10uF\u7535\u5bb9&#xff0c;\u590d\u4f4d\u65f6\u95f4\u7ea60.1\u79d2<\/li>\n<li>\u7535\u6e90\u6ee4\u6ce2&#xff1a;\u5728VCC\u548cGND\u4e4b\u95f4\u52a0\u4e2a0.1uF\u53bb\u8026\u7535\u5bb9&#xff0c;\u80fd\u6709\u6548\u51cf\u5c11\u5355\u7247\u673a\u91cd\u542f\u95ee\u9898<\/li>\n<\/ul>\n<p>\u5b9e\u9645\u710a\u63a5\u65f6&#xff0c;\u6676\u632f\u8981\u5c3d\u91cf\u9760\u8fd1\u5355\u7247\u673a\u5f15\u811a&#xff0c;\u5426\u5219\u5bb9\u6613\u5bfc\u81f4\u65f6\u949f\u4e0d\u7a33\u5b9a\u3002\u6211\u66fe\u7ecf\u56e0\u4e3a\u6676\u632f\u8d70\u7ebf\u592a\u957f&#xff0c;\u5bfc\u81f4\u6570\u7801\u7ba1\u663e\u793a\u95ea\u70c1&#xff0c;\u6298\u817e\u4e86\u534a\u5929\u624d\u627e\u5230\u95ee\u9898\u3002<\/p>\n<h4>2.2 HC-SR04\u6a21\u5757\u539f\u7406\u4e0e\u4f7f\u7528<\/h4>\n<p>HC-SR04\u6a21\u5757\u67094\u4e2a\u5f15\u811a&#xff1a;<\/p>\n<ul>\n<li>VCC&#xff1a;5V\u4f9b\u7535&#xff08;\u4f4e\u4e8e4.5V\u4f1a\u5f71\u54cd\u6d4b\u91cf\u8ddd\u79bb&#xff09;<\/li>\n<li>Trig&#xff1a;\u89e6\u53d1\u4fe1\u53f7\u8f93\u5165&#xff08;\u81f3\u5c1110us\u9ad8\u7535\u5e73&#xff09;<\/li>\n<li>Echo&#xff1a;\u56de\u6ce2\u4fe1\u53f7\u8f93\u51fa&#xff08;\u9ad8\u7535\u5e73\u6301\u7eed\u65f6\u95f4\u5bf9\u5e94\u8ddd\u79bb&#xff09;<\/li>\n<li>GND&#xff1a;\u63a5\u5730<\/li>\n<\/ul>\n<p>\u5de5\u4f5c\u65f6\u5e8f\u5f88\u5173\u952e&#xff1a;<\/p>\n<li>\u7ed9Trig\u5f15\u811a\u81f3\u5c1110us\u7684\u9ad8\u7535\u5e73<\/li>\n<li>\u6a21\u5757\u81ea\u52a8\u53d1\u90018\u4e2a40kHz\u8d85\u58f0\u6ce2\u8109\u51b2<\/li>\n<li>\u6a21\u5757\u68c0\u6d4b\u56de\u6ce2\u5e76\u8f93\u51fa\u9ad8\u7535\u5e73<\/li>\n<li>\u9ad8\u7535\u5e73\u6301\u7eed\u65f6\u95f4\u5c31\u662f\u8d85\u58f0\u6ce2\u5f80\u8fd4\u65f6\u95f4<\/li>\n<p>\u8ba1\u7b97\u8ddd\u79bb\u7684\u516c\u5f0f&#xff1a;\u8ddd\u79bb &#061; (\u9ad8\u7535\u5e73\u65f6\u95f4 * \u58f0\u901f) \/ 2<\/p>\n<p>\u58f0\u901f\u5728\u5e38\u6e29\u4e0b\u7ea6340m\/s&#xff0c;\u4f46\u4f1a\u968f\u6e29\u5ea6\u53d8\u5316\u3002\u6bcf\u5347\u9ad81\u2103&#xff0c;\u58f0\u901f\u589e\u52a00.6m\/s\u3002\u5982\u679c\u8981\u63d0\u9ad8\u7cbe\u5ea6&#xff0c;\u9700\u8981\u52a0\u5165\u6e29\u5ea6\u4f20\u611f\u5668\u8fdb\u884c\u8865\u507f\u3002\u6211\u5b9e\u6d4b\u8fc7&#xff0c;\u572820\u2103\u73af\u5883\u4e0b&#xff0c;\u6d4b\u91cf\u8bef\u5dee\u5c0f\u4e8e1%&#xff1b;\u4f46\u57280\u2103\u548c40\u2103\u65f6&#xff0c;\u8bef\u5dee\u4f1a\u8fbe\u52303%\u4ee5\u4e0a\u3002<\/p>\n<h4>2.3 \u663e\u793a\u4e0e\u62a5\u8b66\u7535\u8def<\/h4>\n<p>\u6570\u7801\u7ba1\u9a71\u52a8\u65b9\u6848&#xff1a;<br \/>\n\u6211\u7528\u7684\u662f4\u4f4d\u5171\u9634\u6570\u7801\u7ba1&#xff0c;\u91c7\u7528\u52a8\u6001\u626b\u63cf\u65b9\u5f0f\u3002P0\u53e3\u8f93\u51fa\u6bb5\u7801&#xff08;\u8981\u52a0\u4e0a\u62c9\u7535\u963b&#xff09;&#xff0c;P2.0-P2.3\u63a7\u5236\u4f4d\u9009\u3002\u52a8\u6001\u626b\u63cf\u65f6\u8981\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>\u626b\u63cf\u9891\u7387\u4e0d\u80fd\u592a\u4f4e&#xff08;\u5426\u5219\u95ea\u70c1&#xff09;&#xff0c;\u4e5f\u4e0d\u80fd\u592a\u9ad8&#xff08;\u5bfc\u81f4\u4eae\u5ea6\u4e0d\u8db3&#xff09;<\/li>\n<li>\u4e00\u822c\u8bbe\u7f6e\u5728100-200Hz\u4e4b\u95f4&#xff0c;\u6bcf\u4f4d\u6570\u7801\u7ba1\u70b9\u4eae2-5ms<\/li>\n<\/ul>\n<p>\u5b9e\u9645\u8c03\u8bd5\u65f6\u53d1\u73b0&#xff0c;\u5982\u679c\u76f4\u63a5\u9a71\u52a8\u6570\u7801\u7ba1&#xff0c;\u5355\u7247\u673aIO\u53e3\u7535\u6d41\u53ef\u80fd\u4e0d\u8db3\u3002\u6211\u52a0\u4e8674HC245\u7f13\u51b2\u5668\u540e&#xff0c;\u4eae\u5ea6\u660e\u663e\u63d0\u5347\u3002<\/p>\n<p>\u62a5\u8b66\u7535\u8def\u8bbe\u8ba1&#xff1a;<br \/>\n\u75289012 PNP\u4e09\u6781\u7ba1\u9a71\u52a8\u8702\u9e23\u5668&#xff0c;\u57fa\u6781\u901a\u8fc71k\u7535\u963b\u63a5\u5230\u5355\u7247\u673aIO\u53e3\u3002\u5f53IO\u8f93\u51fa\u4f4e\u7535\u5e73\u65f6&#xff0c;\u4e09\u6781\u7ba1\u5bfc\u901a&#xff0c;\u8702\u9e23\u5668\u53d1\u58f0\u3002\u8bb0\u5f97\u5728\u8702\u9e23\u5668\u4e24\u7aef\u53cd\u5411\u5e76\u8054\u4e00\u4e2a\u4e8c\u6781\u7ba1&#xff0c;\u9632\u6b62\u611f\u5e94\u7535\u52a8\u52bf\u635f\u574f\u4e09\u6781\u7ba1\u3002<\/p>\n<h3>3. \u8f6f\u4ef6\u8bbe\u8ba1\u4e0e\u4ee3\u7801\u5b9e\u73b0<\/h3>\n<h4>3.1 \u4e3b\u7a0b\u5e8f\u6846\u67b6<\/h4>\n<p>\u7a0b\u5e8f\u91c7\u7528\u524d\u540e\u53f0\u67b6\u6784&#xff0c;\u4e3b\u5faa\u73af\u4e2d\u5904\u7406\u6309\u952e\u626b\u63cf\u3001\u663e\u793a\u5237\u65b0&#xff0c;\u4e2d\u65ad\u5904\u7406\u8d85\u58f0\u6ce2\u6d4b\u8ddd\u3002<\/p>\n<p>void main() {<br \/>\n    time_init();        \/\/ \u5b9a\u65f6\u5668\u521d\u59cb\u5316<br \/>\n    init_eepom();       \/\/ \u8bfb\u53d6\u4fdd\u5b58\u7684\u9608\u503c<br \/>\n    while(1) {<br \/>\n        key();          \/\/ \u6309\u952e\u626b\u63cf<br \/>\n        key_with();     \/\/ \u6309\u952e\u5904\u7406<br \/>\n        display();      \/\/ \u6570\u7801\u7ba1\u663e\u793a<\/p>\n<p>        if(flag_300ms) {<br \/>\n            flag_300ms &#061; 0;<br \/>\n            send_wave();    \/\/ \u6bcf300ms\u89e6\u53d1\u4e00\u6b21\u6d4b\u8ddd<br \/>\n        }<br \/>\n    }<br \/>\n}<\/p>\n<p>\u5b9a\u65f6\u56680\u7528\u4e8e\u6d4b\u91cfEcho\u9ad8\u7535\u5e73\u65f6\u95f4&#xff0c;\u5b9a\u65f6\u56681\u4ea7\u751f1ms\u4e2d\u65ad\u7528\u4e8e\u6570\u7801\u7ba1\u626b\u63cf\u548c\u6309\u952e\u68c0\u6d4b\u3002\u6211\u5efa\u8bae\u628a\u8d85\u58f0\u6ce2\u89e6\u53d1\u95f4\u9694\u8bbe\u5728200-500ms&#xff0c;\u592a\u9891\u7e41\u4f1a\u5f71\u54cd\u663e\u793a\u5237\u65b0&#xff0c;\u592a\u6162\u5219\u54cd\u5e94\u5ef6\u8fdf\u3002<\/p>\n<h4>3.2 \u8d85\u58f0\u6ce2\u6d4b\u8ddd\u6838\u5fc3\u4ee3\u7801<\/h4>\n<p>void send_wave() {<br \/>\n    c_send &#061; 1;        \/\/ \u89e6\u53d1\u4fe1\u53f7<br \/>\n    delay_10us();      \/\/ \u5ef6\u65f610us<br \/>\n    c_send &#061; 0;<\/p>\n<p>    TH0 &#061; 0;          \/\/ \u5b9a\u65f6\u5668\u6e05\u96f6<br \/>\n    TL0 &#061; 0;<br \/>\n    while(!c_recive);  \/\/ \u7b49\u5f85\u56de\u6ce2\u5f00\u59cb<br \/>\n    TR0 &#061; 1;          \/\/ \u542f\u52a8\u5b9a\u65f6<br \/>\n    while(c_recive) {  \/\/ \u7b49\u5f85\u56de\u6ce2\u7ed3\u675f<br \/>\n        flag_time0 &#061; TH0 * 256 &#043; TL0;<br \/>\n        if(flag_time0 &gt; 65000) { \/\/ \u8d85\u65f6\u5904\u7406<br \/>\n            TR0 &#061; 0;<br \/>\n            distance &#061; 888;    \/\/ \u663e\u793a888\u8868\u793a\u8d85\u8303\u56f4<br \/>\n            break;<br \/>\n        }<br \/>\n    }<br \/>\n    TR0 &#061; 0;<\/p>\n<p>    \/\/ \u8ba1\u7b97\u8ddd\u79bb&#xff08;\u5355\u4f4d&#xff1a;cm&#xff09;<br \/>\n    distance &#061; (TH0 * 256 &#043; TL0) * 0.017;  \/\/ 0.017&#061;340\/2\/10000<br \/>\n    if(distance &gt; 350) distance &#061; 888;     \/\/ \u8d85\u8fc73.5m\u663e\u793a888<br \/>\n}<\/p>\n<p>\u8fd9\u91cc\u6709\u4e2a\u91cd\u8981\u7ec6\u8282&#xff1a;0.017\u8fd9\u4e2a\u7cfb\u6570\u7684\u7531\u6765\u3002\u58f0\u901f340m\/s &#061; 34000cm\/s&#xff0c;\u6362\u7b97\u6210cm\/\u03bcs\u662f0.034\u3002\u56e0\u4e3a\u65f6\u95f4\u662f\u5f80\u8fd4\u65f6\u95f4&#xff0c;\u6240\u4ee5\u8981\u9664\u4ee52&#xff0c;\u5f97\u52300.017\u3002\u5b9e\u9645\u6d4b\u91cf\u65f6&#xff0c;\u8fd9\u4e2a\u503c\u9700\u8981\u6839\u636e\u6e29\u5ea6\u5fae\u8c03\u3002<\/p>\n<h4>3.3 \u6e29\u5ea6\u8865\u507f\u7b97\u6cd5<\/h4>\n<p>\u4e3a\u4e86\u63d0\u9ad8\u7cbe\u5ea6&#xff0c;\u6211\u52a0\u5165\u4e86DS18B20\u6e29\u5ea6\u4f20\u611f\u5668\u8fdb\u884c\u58f0\u901f\u8865\u507f&#xff1a;<\/p>\n<p>float get_speed_by_temperature(float temp) {<br \/>\n    \/\/ \u58f0\u901f &#061; 331.5 &#043; 0.607 * \u6e29\u5ea6<br \/>\n    return 331.5 &#043; 0.607 * temp;<br \/>\n}<\/p>\n<p>void calculate_distance() {<br \/>\n    float temperature &#061; read_temperature();<br \/>\n    float speed &#061; get_speed_by_temperature(temperature);<br \/>\n    distance &#061; (time * speed \/ 2) * 100;  \/\/ \u6362\u7b97\u6210cm<br \/>\n}<\/p>\n<p>\u5b9e\u6d4b\u663e\u793a&#xff0c;\u52a0\u5165\u6e29\u5ea6\u8865\u507f\u540e&#xff0c;\u57280-40\u2103\u8303\u56f4\u5185&#xff0c;\u8bef\u5dee\u4ece\u539f\u6765\u76843%\u964d\u4f4e\u52300.5%\u4ee5\u5185\u3002<\/p>\n<h4>3.4 \u6309\u952e\u5904\u7406\u4e0eEEPROM\u5b58\u50a8<\/h4>\n<p>\u8bbe\u7f6e\u6309\u952e\u91c7\u7528\u77ed\u6309\u5207\u6362\u6a21\u5f0f\u3001\u957f\u6309\u8fdb\u5165\u8bbe\u7f6e\u7684\u65b9\u6848&#xff1a;<\/p>\n<ul>\n<li>K1&#xff1a;\u5207\u6362\u663e\u793a\u6a21\u5f0f&#xff08;\u5f53\u524d\u8ddd\u79bb\/\u62a5\u8b66\u9608\u503c&#xff09;<\/li>\n<li>K2&#xff1a;\u9608\u503c\u52a01&#xff08;\u957f\u6309\u8fde\u52a0&#xff09;<\/li>\n<li>K3&#xff1a;\u9608\u503c\u51cf1&#xff08;\u957f\u6309\u8fde\u51cf&#xff09;<\/li>\n<\/ul>\n<p>\u9608\u503c\u4fdd\u5b58\u5728STC89C52\u7684EEPROM\u4e2d&#xff08;\u5176\u5b9e\u662fData Flash\u6a21\u62df\u7684&#xff09;&#xff0c;\u6389\u7535\u4e0d\u4e22\u5931\u3002\u5199\u5165\u524d\u8981\u5148\u64e6\u9664\u6574\u4e2a\u6247\u533a&#xff1a;<\/p>\n<p>void write_eepom() {<br \/>\n    SectorErase(0x2000);              \/\/ \u64e6\u9664\u6247\u533a<br \/>\n    byte_write(0x2000, set_d % 256);  \/\/ \u5b58\u50a8\u4f4e\u5b57\u8282<br \/>\n    byte_write(0x2001, set_d \/ 256);  \/\/ \u5b58\u50a8\u9ad8\u5b57\u8282<br \/>\n}<\/p>\n<h3>4. \u5b9e\u7269\u5236\u4f5c\u4e0e\u8c03\u8bd5\u6280\u5de7<\/h3>\n<h4>4.1 PCB\u5e03\u5c40\u5efa\u8bae<\/h4>\n<li>\u7535\u6e90\u5206\u533a&#xff1a;\u6a21\u62df\u90e8\u5206&#xff08;\u8d85\u58f0\u6ce2\u6a21\u5757&#xff09;\u548c\u6570\u5b57\u90e8\u5206&#xff08;\u5355\u7247\u673a&#xff09;\u5206\u5f00\u4f9b\u7535&#xff0c;\u7528\u78c1\u73e0\u62160\u03a9\u7535\u963b\u9694\u79bb<\/li>\n<li>\u4fe1\u53f7\u8d70\u7ebf&#xff1a;Trig\u548cEcho\u4fe1\u53f7\u7ebf\u8981\u77ed\u800c\u76f4&#xff0c;\u8fdc\u79bb\u7535\u6e90\u7ebf<\/li>\n<li>\u63a5\u5730\u7b56\u7565&#xff1a;\u91c7\u7528\u661f\u578b\u63a5\u5730&#xff0c;\u8d85\u58f0\u6ce2\u6a21\u5757\u7684\u5730\u7ebf\u5355\u72ec\u8d70\u4e00\u6761\u5230\u7535\u6e90\u5730<\/li>\n<li>\u9000\u8026\u7535\u5bb9&#xff1a;\u5728\u6bcf\u4e2a\u82af\u7247\u7684VCC\u548cGND\u4e4b\u95f4\u52a00.1uF\u9676\u74f7\u7535\u5bb9<\/li>\n<p>\u6211\u7b2c\u4e00\u6b21\u753b\u677f\u65f6\u6ca1\u6ce8\u610f\u8fd9\u4e9b&#xff0c;\u7ed3\u679c\u6d4b\u91cf\u7ed3\u679c\u8df3\u52a8\u5f88\u5927\u3002\u540e\u6765\u91cd\u65b0\u5e03\u5c40&#xff0c;\u7a33\u5b9a\u6027\u660e\u663e\u6539\u5584\u3002<\/p>\n<h4>4.2 \u5e38\u89c1\u95ee\u9898\u89e3\u51b3<\/h4>\n<p>\u95ee\u98981&#xff1a;\u6d4b\u91cf\u7ed3\u679c\u603b\u662f888&#xff08;\u8d85\u8303\u56f4&#xff09;<\/p>\n<ul>\n<li>\u68c0\u67e5Trig\u4fe1\u53f7\u662f\u5426\u6b63\u5e38&#xff08;\u7528\u793a\u6ce2\u5668\u770b10us\u8109\u51b2&#xff09;<\/li>\n<li>\u786e\u4fddEcho\u4fe1\u53f7\u7ebf\u8fde\u63a5\u6b63\u786e<\/li>\n<li>\u5bf9\u8c61\u662f\u5426\u5728\u6d4b\u91cf\u8303\u56f4\u5185&#xff08;2cm-4m&#xff09;<\/li>\n<\/ul>\n<p>\u95ee\u98982&#xff1a;\u6d4b\u91cf\u503c\u8df3\u52a8\u5927<\/p>\n<ul>\n<li>\u5728VCC\u548cGND\u4e4b\u95f4\u52a0100uF\u7535\u89e3\u7535\u5bb9<\/li>\n<li>\u8f6f\u4ef6\u4e0a\u91c7\u7528\u591a\u6b21\u6d4b\u91cf\u53d6\u5e73\u5747\u503c\u7684\u7b97\u6cd5<\/li>\n<li>\u907f\u514d\u6d4b\u91cf\u8868\u9762\u67d4\u8f6f\u6216\u503e\u659c\u7684\u7269\u4f53<\/li>\n<\/ul>\n<p>\u95ee\u98983&#xff1a;\u6570\u7801\u7ba1\u663e\u793a\u95ea\u70c1<\/p>\n<ul>\n<li>\u8c03\u6574\u52a8\u6001\u626b\u63cf\u9891\u7387&#xff08;\u6211\u4e00\u822c\u7528150Hz&#xff09;<\/li>\n<li>\u68c0\u67e5\u4f4d\u9009\u9a71\u52a8\u80fd\u529b&#xff0c;\u5fc5\u8981\u65f6\u52a0\u4e09\u6781\u7ba1\u9a71\u52a8<\/li>\n<\/ul>\n<p>\u95ee\u98984&#xff1a;\u8702\u9e23\u5668\u4e0d\u54cd\u6216\u58f0\u97f3\u5c0f<\/p>\n<ul>\n<li>\u68c0\u67e5\u4e09\u6781\u7ba1\u5f15\u811a\u662f\u5426\u63a5\u9519&#xff08;9012\u662fPNP\u578b&#xff09;<\/li>\n<li>\u8702\u9e23\u5668\u662f\u5426\u652f\u63015V\u9a71\u52a8&#xff08;\u6709\u7684\u9700\u898112V&#xff09;<\/li>\n<\/ul>\n<h4>4.3 \u6821\u51c6\u65b9\u6cd5<\/h4>\n<p>\u5373\u4f7f\u6709\u6e29\u5ea6\u8865\u507f&#xff0c;\u4ecd\u7136\u9700\u8981\u73b0\u573a\u6821\u51c6&#xff1a;<\/p>\n<li>\u6d4b\u91cf\u4e00\u4e2a\u5df2\u77e5\u8ddd\u79bb&#xff08;\u5982100.0cm&#xff09;<\/li>\n<li>\u8bb0\u5f55\u6d4b\u91cf\u503c&#xff08;\u598298.5cm&#xff09;<\/li>\n<li>\u8ba1\u7b97\u8865\u507f\u7cfb\u6570&#xff1a;100.0\/98.5 \u2248 1.015<\/li>\n<li>\u5728\u7a0b\u5e8f\u4e2d\u4e58\u4ee5\u8fd9\u4e2a\u7cfb\u6570<\/li>\n<p>\u6211\u901a\u5e38\u5728\u4e0d\u540c\u8ddd\u79bb&#xff08;20cm\u300150cm\u3001100cm&#xff09;\u5404\u6d4b\u4e00\u6b21&#xff0c;\u53d6\u5e73\u5747\u8865\u507f\u7cfb\u6570\u3002<\/p>\n<h3>5. \u4f18\u5316\u4e0e\u6269\u5c55\u65b9\u5411<\/h3>\n<p>\u8fd9\u4e2a\u57fa\u7840\u7248\u672c\u5b8c\u6210\u540e&#xff0c;\u8fd8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u4f18\u5316&#xff1a;<\/p>\n<p>\u8f6f\u4ef6\u6ee4\u6ce2\u7b97\u6cd5&#xff1a;<br \/>\n\u91c7\u7528\u6ed1\u52a8\u5e73\u5747\u6ee4\u6ce2&#043;\u4e2d\u503c\u6ee4\u6ce2&#xff0c;\u80fd\u6709\u6548\u6d88\u9664\u7a81\u53d1\u5e72\u6270&#xff1a;<\/p>\n<p>#define FILTER_LEN 5<br \/>\nuint16_t filter_buf[FILTER_LEN];<\/p>\n<p>uint16_t distance_filter(uint16_t new_val) {<br \/>\n    \/\/ \u6ed1\u52a8\u7a97\u53e3<br \/>\n    for(int i &#061; 0; i &lt; FILTER_LEN-1; i&#043;&#043;) {<br \/>\n        filter_buf[i] &#061; filter_buf[i&#043;1];<br \/>\n    }<br \/>\n    filter_buf[FILTER_LEN-1] &#061; new_val;<\/p>\n<p>    \/\/ \u4e2d\u503c\u6ee4\u6ce2<br \/>\n    bubble_sort(filter_buf, FILTER_LEN);<br \/>\n    return filter_buf[FILTER_LEN\/2];<br \/>\n}<\/p>\n<p>\u4f4e\u529f\u8017\u8bbe\u8ba1&#xff1a;<br \/>\n\u5982\u679c\u7528\u4e8e\u7535\u6c60\u4f9b\u7535&#xff0c;\u53ef\u4ee5\u52a0\u5165\u4f11\u7720\u6a21\u5f0f&#xff1a;<\/p>\n<ul>\n<li>\u6b63\u5e38\u6a21\u5f0f\u4e0b\u6bcf\u79d2\u6d4b\u91cf\u4e00\u6b21<\/li>\n<li>\u65e0\u53d8\u5316\u65f6\u8fdb\u5165\u4f11\u7720&#xff0c;\u6bcf10\u79d2\u5524\u9192\u4e00\u6b21<\/li>\n<li>\u6309\u952e\u6216\u8ddd\u79bb\u53d8\u5316\u65f6\u7acb\u5373\u5524\u9192<\/li>\n<\/ul>\n<p>\u5b9e\u6d4b\u4f11\u7720\u6a21\u5f0f\u4e0b&#xff0c;\u6574\u673a\u7535\u6d41\u4ece20mA\u964d\u52300.5mA\u4ee5\u4e0b\u3002<\/p>\n<p>\u65e0\u7ebf\u4f20\u8f93\u529f\u80fd&#xff1a;<br \/>\n\u53ef\u4ee5\u6dfb\u52a0\u84dd\u7259\u6a21\u5757&#xff08;HC-05&#xff09;\u6216WiFi\u6a21\u5757&#xff08;ESP8266&#xff09;&#xff0c;\u5c06\u6d4b\u91cf\u6570\u636e\u53d1\u9001\u5230\u624b\u673a\u6216\u670d\u52a1\u5668\u3002\u6211\u5728\u4e00\u4e2a\u667a\u80fd\u8f66\u5e93\u9879\u76ee\u4e2d\u5c31\u8fd9\u6837\u505a&#xff0c;\u5f53\u8f66\u8f86\u505c\u9760\u4f4d\u7f6e\u4e0d\u5230\u4f4d\u65f6&#xff0c;\u624b\u673aAPP\u4f1a\u6536\u5230\u63d0\u9192\u3002<\/p>\n<p>\u6700\u7ec8\u5b8c\u6210\u7684\u7cfb\u7edf\u6d4b\u91cf\u7a33\u5b9a&#xff0c;\u663e\u793a\u6e05\u6670&#xff0c;\u62a5\u8b66\u53ca\u65f6\u3002\u7279\u522b\u662f\u52a0\u5165\u4e86\u6e29\u5ea6\u8865\u507f\u548c\u8f6f\u4ef6\u6ee4\u6ce2\u540e&#xff0c;\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u90fd\u80fd\u4fdd\u6301\u8f83\u9ad8\u7684\u6d4b\u91cf\u7cbe\u5ea6\u3002\u5bf9\u4e8e\u521d\u5b66\u8005\u6765\u8bf4&#xff0c;\u4ece\u8fd9\u4e2a\u9879\u76ee\u53ef\u4ee5\u5b66\u5230\u5355\u7247\u673a\u7f16\u7a0b\u3001\u4f20\u611f\u5668\u5e94\u7528\u3001PCB\u8bbe\u8ba1\u3001\u8c03\u8bd5\u6280\u5de7\u7b49\u5b9e\u7528\u6280\u80fd&#xff0c;\u662f\u4e2a\u5f88\u597d\u7684\u7efc\u5408\u5b9e\u8df5\u9879\u76ee\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. 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\/>\n\u7cfb\u7edf\u6838\u5fc3\u5de5\u4f5c\u539f\u7406\u5f88\u7b80\u5355&#xff1a;\u5355\u7247\u673a\u89e6\u53d1HC-SR04\u53d1\u5c04\u8d85\u58f0\u6ce2&#xff0c;\u8ba1\u7b97\u4ece\u53d1\u5c04\u5230\u63a5\u6536\u56de\u6ce2\u7684\u65f6\u95f4\u5dee&amp;#xff<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8183,8184,8182,2489],"topic":[],"class_list":["post-76205","post","type-post","status-publish","format-standard","hentry","category-server","tag-hc-sr04","tag-stc89c52","tag-8182","tag-2489"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u57fa\u4e8eSTC89C52\u4e0eHC-SR04\u7684\u8d85\u58f0\u6ce2\u6d4b\u8ddd\u7cfb\u7edf\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\uff08\u9644\u6e90\u7801\u4e0e\u5b9e\u7269\u8c03\u8bd5\uff09 - 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