{"id":43175,"date":"2025-06-11T08:56:01","date_gmt":"2025-06-11T00:56:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/43175.html"},"modified":"2025-06-11T08:56:01","modified_gmt":"2025-06-11T00:56:01","slug":"stm32%e4%b9%8bdht11%e6%b8%a9%e6%b9%bf%e5%ba%a6%e4%bc%a0%e6%84%9f%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/43175.html","title":{"rendered":"STM32\u4e4bDHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

\u4e00 DHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u7b80\u4ecb<\/p>\n

1.1 \u4f20\u611f\u5668\u7279\u70b9<\/p>\n

1.2 \u4f20\u611f\u5668\u7279\u6027<\/p>\n

1.3 \u4f20\u611f\u5668\u5f15\u811a\u8bf4\u660e<\/p>\n

\u4e8c \u6d4b\u91cf\u539f\u7406\u53ca\u65b9\u6cd5<\/p>\n

2.1 \u5178\u578b\u5e94\u7528\u7535\u8def<\/p>\n

2.2\u00a0\u5355\u7ebf\u5236\u4e32\u884c\u7b80\u4ecb<\/p>\n

2.2.1 \u4e32\u884c\u63a5\u53e3\u00a0\u00a0(\u5355\u7ebf\u53cc\u5411)<\/p>\n

2.2.2 \u6570\u636e\u793a\u4f8b<\/p>\n

2.3 \u901a\u4fe1\u65f6\u5e8f\u00a0<\/p>\n

\u4e09 \u5355\u7247\u673a\u7b80\u4ecb<\/p>\n

3.1 STM32F103C8T6\u6700\u5c0f\u7cfb\u7edf\u677f<\/p>\n

\u56db \u63a5\u7ebf\u8bf4\u660e<\/p>\n

4.1 DHT11.C\u5b8f\u5b9a\u4e49<\/p>\n

4.2\u00a0\u00a0DHT11.H\u5b8f\u5b9a\u4e49<\/p>\n

\u4e94 \u7a0b\u5e8f\u8bbe\u8ba1<\/p>\n

5.1 DHT11.C<\/p>\n

5.1.1 \u590d\u4f4dDHT11<\/p>\n

5.1.2 \u68c0\u67e5DHT11\u5de5\u4f5c\u662f\u5426\u6b63\u5e38\u00a0<\/p>\n

\u00a05.1.3 \u8bfb\u53d6\u4e00\u4f4d\u6570\u636e<\/p>\n

5.1.4 \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u00a0<\/p>\n

5.1.5 \u8bfb\u53d6\u6e29\u6e7f\u5ea6\u503c\u00a0<\/p>\n

5.1.6 \u5b8c\u6574DHT11.C\u7a0b\u5e8f\u00a0<\/p>\n

5.2 DHT11.H<\/p>\n

5.3 \u6dfb\u52a0\u5934\u6587\u4ef6<\/p>\n

5.4 \u5b9a\u4e49\u53d8\u91cf<\/p>\n

\u00a05.5 \u521d\u59cb\u5316<\/p>\n

\u00a05.6 \u6d4b\u91cf\u6e29\u6e7f\u5ea6<\/p>\n

\u4e03 \u6d4b\u91cf\u6548\u679c<\/p>\n

\n

\u00a0<\/p>\n

\u4e00 DHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u7b80\u4ecb<\/h2>\n

1.1 \u4f20\u611f\u5668\u7279\u70b9<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0DHT11\u6570\u5b57\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u662f\u4e00\u6b3e\u542b\u6709\u5df2\u6821\u51c6\u6570\u5b57\u4fe1\u53f7\u8f93\u51fa\u7684\u6e29\u6e7f\u5ea6\u590d\u5408\u4f20\u611f\u5668\u3002\u5b83\u5e94\u7528\u4e13\u7528\u7684\u6570\u5b57\u6a21\u5757\u91c7\u96c6\u6280\u672f\u548c\u6e29\u6e7f\u5ea6\u4f20\u611f\u6280\u672f，\u786e\u4fdd\u4ea7\u54c1\u5177\u6709\u6781\u9ad8\u7684\u53ef\u9760\u6027\u4e0e\u5353\u8d8a\u7684\u957f\u671f\u7a33\u5b9a\u6027\u3002\u4f20\u611f\u5668\u5305\u62ec\u4e00\u4e2a\u7535\u963b\u5f0f\u611f\u6e7f\u5143\u4ef6\u548c\u4e00\u4e2aNTC\u6d4b\u6e29\u5143\u4ef6，\u5e76\u4e0e\u4e00\u4e2a\u9ad8\u6027\u80fd8\u4f4d\u5355\u7247\u673a\u76f8\u8fde\u63a5\u3002\u56e0\u6b64\u8be5\u4ea7\u54c1\u5177\u6709\u54c1\u8d28\u5353\u8d8a\u3001\u8d85\u5feb\u54cd\u5e94\u3001\u6297\u5e72\u6270\u80fd\u529b\u5f3a\u3001\u6027\u4ef7\u6bd4\u6781\u9ad8\u7b49\u4f18\u70b9\u3002DHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n

\"407cafd1156d48c3aca2ced960f77c1d.png\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0\u6bcf\u4e2aDHT11\u4f20\u611f\u5668\u90fd\u5728\u6781\u4e3a\u7cbe\u786e\u7684\u6e7f\u5ea6\u6821\u9a8c\u5ba4\u4e2d\u8fdb\u884c\u6821\u51c6\u3002\u6821\u51c6\u7cfb\u6570\u4ee5\u7a0b\u5e8f\u7684\u5f62\u5f0f\u50a8\u5b58\u5728OTP\u5185\u5b58\u4e2d，\u4f20\u611f\u5668\u5185\u90e8\u5728\u68c0\u6d4b\u4fe1\u53f7\u7684\u5904\u7406\u8fc7\u7a0b\u4e2d\u8981\u8c03\u7528\u8fd9\u4e9b\u6821\u51c6\u7cfb\u6570\u3002\u5355\u7ebf\u5236\u4e32\u884c\u63a5\u53e3，\u4f7f\u7cfb\u7edf\u96c6\u6210\u53d8\u5f97\u7b80\u6613\u5feb\u6377\u3002\u8d85\u5c0f\u7684\u4f53\u79ef\u3001\u6781\u4f4e\u7684\u529f\u8017，\u4fe1\u53f7\u4f20\u8f93\u8ddd\u79bb\u53ef\u8fbe20\u7c73\u4ee5\u4e0a，\u4f7f\u5176\u6210\u4e3a\u5404\u7c7b\u5e94\u7528\u751a\u81f3\u6700\u4e3a\u82db\u523b\u7684\u5e94\u7528\u573a\u5408\u7684\u6700\u4f73\u9009\u5219\u3002\u4ea7\u54c1\u4e3a 4 \u9488\u5355\u6392\u5f15\u811a\u5c01\u88c5\u3002<\/p>\n

1.2 \u4f20\u611f\u5668\u7279\u6027<\/h3>\n

\"06953e8c5c3e4bfaa21cee79d283912e.png\"<\/p>\n

1.3 \u4f20\u611f\u5668\u5f15\u811a\u8bf4\u660e<\/h3>\n\n\n\n\n\n\n\n
\n

\u5f15\u811a<\/p>\n<\/td>\n

\n

\u540d\u79f0<\/p>\n<\/td>\n

\n

\u6ce8\u91ca<\/p>\n<\/td>\n<\/tr>\n

\n

1<\/p>\n<\/td>\n

\n

VDD<\/p>\n<\/td>\n

\n

\u4f9b\u7535 3－5.5VDC<\/p>\n<\/td>\n<\/tr>\n

\n

2<\/p>\n<\/td>\n

\n

DATA<\/p>\n<\/td>\n

\n

\u4e32\u884c\u6570\u636e，\u5355\u603b\u7ebf<\/p>\n<\/td>\n<\/tr>\n

\n

3<\/p>\n<\/td>\n

\n

NC<\/p>\n<\/td>\n

\n

\u7a7a\u811a，\u8bf7\u60ac\u7a7a<\/p>\n<\/td>\n<\/tr>\n

\n

4<\/p>\n<\/td>\n

\n

GND<\/p>\n<\/td>\n

\n

\u63a5\u5730，\u7535\u6e90\u8d1f\u6781<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e8c \u6d4b\u91cf\u539f\u7406\u53ca\u65b9\u6cd5<\/h2>\n

2.1 \u5178\u578b\u5e94\u7528\u7535\u8def<\/h3>\n

\"0b89c1c91dcb4130a131cf5d629d4909.png\"<\/p>\n

\u5efa\u8bae\u8fde\u63a5\u7ebf\u957f\u5ea6\u77ed\u4e8e20\u7c73\u65f6\u75285K\u4e0a\u62c9\u7535\u963b,\u5927\u4e8e20\u7c73\u65f6\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u4f7f\u7528\u5408\u9002\u7684\u4e0a\u62c9\u7535\u963b\u00a0\u3002<\/p>\n

\u7535\u6e90\u5f15\u811a：DHT11\u7684\u4f9b\u7535\u7535\u538b\u4e3a 3－5.5V\u3002\u4f20\u611f\u5668\u4e0a\u7535\u540e，\u8981\u7b49\u5f85 1s \u4ee5\u8d8a\u8fc7\u4e0d\u7a33\u5b9a\u72b6\u6001，\u5728\u6b64\u671f\u95f4\u65e0\u9700\u53d1\u9001\u4efb\u4f55\u6307\u4ee4\u3002\u7535\u6e90\u5f15\u811a（VDD，GND）\u4e4b\u95f4\u53ef\u589e\u52a0\u4e00\u4e2a100nF \u7684\u7535\u5bb9，\u7528\u4ee5\u53bb\u8026\u6ee4\u6ce2\u3002\u00a0<\/p>\n

2.2\u00a0\u5355\u7ebf\u5236\u4e32\u884c\u7b80\u4ecb<\/h3>\n

\"f9a42c32b1b34ff5a15f72a06e74d3b9.png\"<\/p>\n

2.2.1 \u4e32\u884c\u63a5\u53e3\u00a0\u00a0(\u5355\u7ebf\u53cc\u5411)<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0DATA \u7528\u4e8e\u5fae\u5904\u7406\u5668\u4e0e DHT11\u4e4b\u95f4\u7684\u901a\u8baf\u548c\u540c\u6b65,\u91c7\u7528\u5355\u603b\u7ebf\u6570\u636e\u683c\u5f0f,\u4e00\u6b21\u901a\u8baf\u65f6\u95f44ms\u5de6\u53f3,\u6570\u636e\u5206\u5c0f\u6570\u90e8\u5206\u548c\u6574\u6570\u90e8\u5206,\u5177\u4f53\u683c\u5f0f\u5728\u4e0b\u9762\u8bf4\u660e,\u5f53\u524d\u5c0f\u6570\u90e8\u5206\u7528\u4e8e\u4ee5\u540e\u6269\u5c55,\u73b0\u8bfb\u51fa\u4e3a\u96f6\u3002\u64cd\u4f5c\u6d41\u7a0b:\u4e00\u6b21\u5b8c\u6574\u7684\u6570\u636e\u4f20\u8f93\u4e3a40bit,\u9ad8\u4f4d\u5148\u51fa\u3002<\/p>\n

\u6570\u636e\u683c\u5f0f:8bit\u6e7f\u5ea6\u6574\u6570\u6570\u636e+8bit\u6e7f\u5ea6\u5c0f\u6570\u6570\u636e+8bi\u6e29\u5ea6\u6574\u6570\u6570\u636e+8bit\u6e29\u5ea6\u5c0f\u6570\u6570\u636e+8bit\u6821\u9a8c\u548c<\/p>\n

\u6570\u636e\u4f20\u9001\u6b63\u786e\u65f6\u6821\u9a8c\u548c\u6570\u636e\u7b49\u4e8e\u201c8bit\u6e7f\u5ea6\u6574\u6570\u6570\u636e+8bit\u6e7f\u5ea6\u5c0f\u6570\u6570\u636e+8bi\u6e29\u5ea6\u6574\u6570\u6570\u636e+8bit\u6e29<\/p>\n

\u5ea6\u5c0f\u6570\u6570\u636e\u201d\u6240\u5f97\u7ed3\u679c\u7684\u672b8\u4f4d\u3002<\/p>\n

2.2.2 \u6570\u636e\u793a\u4f8b<\/h4>\n

\u63a5\u6536\u5230\u7684\u6570\u636e\u4e3a：<\/p>\n

\"3f3ef8b232b9487da749e4ceb825de7f.png\"<\/p>\n

\u8ba1\u7b97：<\/p>\n

\"5ce92a27d6984089a3d44d6ec4d893d3.png\"<\/p>\n

\u5bf9\u6bd4\u63a5\u6536\u5230\u7684\u6821\u9a8c\u4f4d，\u6570\u636e\u6b63\u786e：<\/p>\n

\"6fac8b007ea34946a299c1f1322c07c6.png\"<\/p>\n

2.3 \u901a\u4fe1\u65f6\u5e8f\u00a0<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0\u7528\u6237MCU\u53d1\u9001\u4e00\u6b21\u5f00\u59cb\u4fe1\u53f7\u540e,DHT11\u4ece\u4f4e\u529f\u8017\u6a21\u5f0f\u8f6c\u6362\u5230\u9ad8\u901f\u6a21\u5f0f,\u7b49\u5f85\u4e3b\u673a\u5f00\u59cb\u4fe1\u53f7\u7ed3\u675f\u540e,DHT11\u53d1\u9001\u54cd\u5e94\u4fe1\u53f7,\u9001\u51fa40bit\u7684\u6570\u636e,\u5e76\u89e6\u53d1\u4e00\u6b21\u4fe1\u53f7\u91c7\u96c6,\u7528\u6237\u53ef\u9009\u62e9\u8bfb\u53d6\u90e8\u5206\u6570\u636e.\u4ece\u6a21\u5f0f\u4e0b,DHT11\u63a5\u6536\u5230\u5f00\u59cb\u4fe1\u53f7\u89e6\u53d1\u4e00\u6b21\u6e29\u6e7f\u5ea6\u91c7\u96c6,\u5982\u679c\u6ca1\u6709\u63a5\u6536\u5230\u4e3b\u673a\u53d1\u9001\u5f00\u59cb\u4fe1\u53f7,DHT11\u4e0d\u4f1a\u4e3b\u52a8\u8fdb\u884c\u6e29\u6e7f\u5ea6\u91c7\u96c6.\u91c7\u96c6\u6570\u636e\u540e\u8f6c\u6362\u5230\u4f4e\u901f\u6a21\u5f0f\u3002<\/p>\n

\u901a\u8baf\u8fc7\u7a0b\u5982\u56fe\u6240\u793a：<\/p>\n

\"169b3c59d4a746c7997514670acdf14f.png\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u603b\u7ebf\u7a7a\u95f2\u72b6\u6001\u4e3a\u9ad8\u7535\u5e73,\u4e3b\u673a\u628a\u603b\u7ebf\u62c9\u4f4e\u7b49\u5f85DHT11\u54cd\u5e94,\u4e3b\u673a\u628a\u603b\u7ebf\u62c9\u4f4e\u5fc5\u987b\u5927\u4e8e18\u6beb\u79d2,\u4fdd\u8bc1DHT11\u80fd\u68c0\u6d4b\u5230\u8d77\u59cb\u4fe1\u53f7\u3002DHT11\u63a5\u6536\u5230\u4e3b\u673a\u7684\u5f00\u59cb\u4fe1\u53f7\u540e,\u7b49\u5f85\u4e3b\u673a\u5f00\u59cb\u4fe1\u53f7\u7ed3\u675f,\u7136\u540e\u53d1\u900180us\u4f4e\u7535\u5e73\u54cd\u5e94\u4fe1\u53f7.\u4e3b\u673a\u53d1\u9001\u5f00\u59cb\u4fe1\u53f7\u7ed3\u675f\u540e,\u5ef6\u65f6\u7b49\u5f8520-40us\u540e, \u8bfb\u53d6DHT11\u7684\u54cd\u5e94\u4fe1\u53f7,\u4e3b\u673a\u53d1\u9001\u5f00\u59cb\u4fe1\u53f7\u540e,\u53ef\u4ee5\u5207\u6362\u5230\u8f93\u5165\u6a21\u5f0f,\u6216\u8005\u8f93\u51fa\u9ad8\u7535\u5e73\u5747\u53ef, \u603b\u7ebf\u7531\u4e0a\u62c9\u7535\u963b\u62c9\u9ad8\u3002<\/p>\n

\"7bf7670d1fe24c04af66c2dd72dcfb5f.png\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0\u603b\u7ebf\u4e3a\u4f4e\u7535\u5e73,\u8bf4\u660eDHT11\u53d1\u9001\u54cd\u5e94\u4fe1\u53f7,DHT11\u53d1\u9001\u54cd\u5e94\u4fe1\u53f7\u540e,\u518d\u628a\u603b\u7ebf\u62c9\u9ad880us,\u51c6\u5907\u53d1\u9001\u6570\u636e,\u6bcf\u4e00bit\u6570\u636e\u90fd\u4ee550us\u4f4e\u7535\u5e73\u65f6\u9699\u5f00\u59cb,\u9ad8\u7535\u5e73\u7684\u957f\u77ed\u5b9a\u4e86\u6570\u636e\u4f4d\u662f0\u8fd8\u662f1.\u683c\u5f0f\u89c1\u4e0b\u9762\u56fe\u793a.\u5982\u679c\u8bfb\u53d6\u54cd\u5e94\u4fe1\u53f7\u4e3a\u9ad8\u7535\u5e73,\u5219DHT11\u6ca1\u6709\u54cd\u5e94,\u8bf7\u68c0\u67e5\u7ebf\u8def\u662f\u5426\u8fde\u63a5\u6b63\u5e38.\u5f53\u6700\u540e\u4e00bit\u6570\u636e\u4f20\u9001\u5b8c\u6bd5\u540e，DHT11\u62c9\u4f4e\u603b\u7ebf50us,\u968f\u540e\u603b\u7ebf\u7531\u4e0a\u62c9\u7535\u963b\u62c9\u9ad8\u8fdb\u5165\u7a7a\u95f2\u72b6\u6001\u3002<\/p>\n

\u6570\u5b570\u4fe1\u53f7\u8868\u793a\u65b9\u6cd5\u5982\u56fe\u6240\u793a，VCC\u4fdd\u6301\u9ad8\u7535\u5e7326-28\u5fae\u79d2：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\"0bb26329061d4cab8d5b65764c25df65.png\"<\/p>\n

\u6570\u5b571\u4fe1\u53f7\u8868\u793a\u65b9\u6cd5\u5982\u56fe\u6240\u793a，VCC\u4fdd\u6301\u9ad8\u7535\u5e7370\u5fae\u79d2：<\/p>\n

\"e031746865284ebaa1e458e0e270fb0a.png\"<\/p>\n

\u4e09 \u5355\u7247\u673a\u7b80\u4ecb<\/h2>\n

3.1 STM32F103C8T6\u6700\u5c0f\u7cfb\u7edf\u677f<\/h3>\n

\"aaec3c7f38d741c88cde6d81934fe72f.jpeg\"<\/p>\n

\u672c\u6587\u4f7f\u7528\u7684\u5f00\u53d1\u677f\u4e3aSTM32F103C8T6\u6700\u5c0f\u7cfb\u7edf\u677f，DHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u4f7f\u7528\u5230\u7684\u5f15\u811a\u4e3aPA11\u5f15\u811a\u3002\u00a0<\/p>\n

\u56db \u63a5\u7ebf\u8bf4\u660e<\/h2>\n

DHT11\u6e29\u6e7f\u5ea6\u4f20\u611f\u5668\u4e0e\u5355\u7247\u673a\u7684\u63a5\u7ebf\u53d6\u51b3\u4e8eDHT11.C\u548cDHT11.H\u4e2d\u7684\u5f15\u811a\u5b8f\u5b9a\u4e49，\u672c\u6587\u4f20\u611f\u5668\u7684DATA\u5f15\u811a\u63a5\u5355\u7247\u673aPA11，VCC\u63a53.3V\u3002<\/p>\n

4.1 DHT11.C\u5b8f\u5b9a\u4e49<\/h3>\n

\u5b9a\u4e49DATA\u5f15\u811a\u4e3a11:<\/p>\n

#define DT GPIO_Pin_11 <\/p>\n

4.2\u00a0\u00a0DHT11.H\u5b8f\u5b9a\u4e49<\/h3>\n

\u5f15\u811a\u8f93\u5165\u8f93\u51fa\u6a21\u5f0f\u914d\u7f6e：\u5b9a\u4e49GPIOA\u5f15\u811a，CRH\u662f\u5f15\u811a\u9ad88\u4f4d\u5373PA8-PA15,\u5c068\u5de6\u79fb12\u4f4d\u662f\u914d\u7f6e\u6210\u8f93\u5165\u6a21\u5f0f，\u5c063\u5de6\u79fb12\u4f4d\u662f\u914d\u7f6e\u6210\u63a8\u633d\u8f93\u51fa\u6a21\u5f0f\u3002<\/p>\n

#define DHT11_IO_IN() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=8<<12;}
\n#define DHT11_IO_OUT() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=3<<12;} <\/p>\n

\u00a0IO\u5b8f\u5b9a\u4e49：<\/p>\n

#defineDHT11_DQ_OUT PAout(11)
\n#defineDHT11_DQ_IN PAin(11) <\/p>\n

\u4e94 \u7a0b\u5e8f\u8bbe\u8ba1<\/h2>\n

5.1 DHT11.C<\/h3>\n

5.1.1 \u590d\u4f4dDHT11<\/h4>\n

\u5c06\u6570\u636e\u7ebf\u914d\u7f6e\u4e3a\u8f93\u51fa\u6a21\u5f0f，\u5148\u62c9\u4f4e\u6570\u636e\u7ebf20ms，\u7136\u540e\u5c06\u6570\u636e\u7ebf\u62c9\u9ad830\u5fae\u79d2，\u5bf9\u5e94\u65f6\u5e8f\u56fe\u5982\u4e0b\u3002<\/p>\n

\"2d8bbf4fcb9d4f76a053ee6f8975eb62.png\"<\/p>\n

void DHT11_Rst(void)
\n{
\nDHT11_IO_OUT(); \/\/SET OUTPUT
\nDHT11_DQ_OUT=0; \/\/\u62c9\u4f4eDQ
\ndelay_ms(20); \/\/\u62c9\u4f4e\u81f3\u5c1118ms
\nDHT11_DQ_OUT=1; \/\/DQ=1
\ndelay_us(30); \/\/\u4e3b\u673a\u62c9\u9ad820~40us
\n} <\/p>\n

5.1.2 \u68c0\u67e5DHT11\u5de5\u4f5c\u662f\u5426\u6b63\u5e38\u00a0<\/h4>\n

\u5c06\u6570\u636e\u7ebf\u914d\u7f6e\u4e3a\u8f93\u5165\u6a21\u5f0f，DHT11\u4f1a\u5148\u62c9\u4f4e80\u5fae\u79d2，\u7136\u540e\u518d\u62c9\u9ad880\u5fae\u79d2，\u5982\u679c\u8d85\u8fc780\u5fae\u79d2\u4ecd\u6ca1\u6709\u56de\u5e94，\u5219\u8fd4\u56de1，DHT11\u8bfb\u53d6\u5931\u8d25，\u5bf9\u5e94\u65f6\u5e8f\u56fe\u5982\u4e0b\u3002<\/p>\n

\"bac0e4e321b14c5d9ec5ccfc81daf9fc.png\"<\/p>\n

u8 DHT11_Check(void)
\n{
\nu8 retry=0;
\nDHT11_IO_IN();\/\/SET INPUT
\n while (DHT11_DQ_IN&&retry<100)\/\/DHT11\u4f1a\u62c9\u4f4e40~80us
\n{
\nretry++;
\ndelay_us(1);
\n};
\nif(retry>=100)return 1;
\nelse retry=0;
\n while (!DHT11_DQ_IN&&retry<100)\/\/DHT11\u62c9\u4f4e\u540e\u4f1a\u518d\u6b21\u62c9\u9ad840~80us
\n{
\nretry++;
\ndelay_us(1);
\n};
\nif(retry>=100)return 1;
\nreturn 0;
\n} <\/p>\n

\u00a05.1.3 \u8bfb\u53d6\u4e00\u4f4d\u6570\u636e<\/h4>\n

\u8be5\u51fd\u6570\u91c7\u7528\u4e24\u4e2awhile\u5faa\u73af\u662f\u7b49\u5f85\u6bcf\u4e2a\u5468\u671f\u7684\u7535\u5e73\u53d8\u5316，\u5148\u7b49\u5f85\u4f4e\u7535\u5e73\u5230\u6765，\u540e\u7b49\u5f85\u9ad8\u7535\u5e73\u5230\u6765，\u5ef6\u65f640us\u540e\u5224\u65ad\u5f15\u811a\u7535\u5e73，\u6765\u5224\u65ad\u8be5\u4f4d\u6570\u636e\u4e3a1\u62160\u3002\u4e4b\u6240\u4ee5\u662f40\u5fae\u79d2\u662f\u56e0\u4e3a\u4f20\u611f\u5668\u6570\u5b570\u7684\u4fe1\u53f7\u6301\u7eed\u65f6\u95f4\u4e3a26-28us，\u6570\u5b571\u7684\u4fe1\u53f7\u6301\u7eed\u65f6\u95f4\u4e3a70us，\u9009\u62e9\u4e00\u4e2a\u4e2d\u503c\u6765\u533a\u5206\u4e24\u79cd\u4fe1\u53f7，\u5f53\u7136\u4e5f\u53ef\u4ee5\u9009\u62e9\u5176\u4ed6\u503c，\u4f46\u6700\u597d\u572840us\u9644\u8fd1\u3002<\/p>\n

u8 DHT11_Read_Bit(void)
\n{
\n u8 retry=0;
\nwhile(DHT11_DQ_IN&&retry<100)\/\/\u7b49\u5f85\u53d8\u4e3a\u4f4e\u7535\u5e73
\n{
\nretry++;
\ndelay_us(1);
\n}
\nretry=0;
\nwhile(!DHT11_DQ_IN&&retry<100)\/\/\u7b49\u5f85\u53d8\u9ad8\u7535\u5e73
\n{
\nretry++;
\ndelay_us(1);
\n}
\ndelay_us(40);\/\/\u7b49\u5f8540us
\nif(DHT11_DQ_IN)return 1;
\nelse return 0;
\n}<\/p>\n

5.1.4 \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u00a0<\/h4>\n

\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u5c31\u662f\u8fde\u7eed\u8bfb\u53d68\u6b21\u6570\u636e\u4f4d，\u5e76\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u4e0d\u65ad\u5de6\u79fb1\u4f4d\u653e\u5230\u9ad8\u4f4d\u3002<\/p>\n

u8 DHT11_Read_Byte(void)
\n{
\nu8 i,dat;
\ndat=0;
\nfor (i=0;i<8;i++)
\n{
\ndat<<=1;
\ndat|=DHT11_Read_Bit();
\n}
\nreturn dat;
\n} <\/p>\n

5.1.5 \u8bfb\u53d6\u6e29\u6e7f\u5ea6\u503c\u00a0<\/h4>\n

\u5f53DHT11\u68c0\u67e5\u65e0\u8bef\u65f6，\u5c06\u8bfb\u53d6\u5230\u768440\u4f4d\u6570\u636e\u5b58\u653e\u57285\u4e2a\u5143\u7d20\u7684\u6570\u7ec4\u4e2d，\u6821\u9a8c\u65e0\u8bef\u540e，\u5c06\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u6570\u636e\u5b58\u653e\u5728temp\u53d8\u91cf\u7684\u5730\u5740\u4e2d，\u5373\u6e29\u5ea6\u7684\u6574\u6570\u90e8\u5206；\u5c06\u7b2c\u4e09\u4e2a\u5b57\u8282\u7684\u6570\u636e\u5b58\u653e\u5728humi\u53d8\u91cf\u7684\u5730\u5740\u4e2d，\u5373\u6e7f\u5ea6\u7684\u6574\u6570\u90e8\u5206\u3002<\/p>\n

u8 DHT11_Read_Data(u8 *temp,u8 *humi)
\n{
\n u8 buf[5];
\nu8 i;
\nDHT11_Rst();
\nif(DHT11_Check()==0)
\n{
\nfor(i=0;i<5;i++)\/\/\u8bfb\u53d640\u4f4d\u6570\u636e
\n{
\nbuf[i]=DHT11_Read_Byte();
\n}
\nif((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
\n{
\n*humi=buf[0];
\n*temp=buf[2];
\n}
\n}
\nelse return 1;
\nreturn 0;
\n}<\/p>\n

5.1.6 \u5b8c\u6574DHT11.C\u7a0b\u5e8f\u00a0<\/h4>\n

\/***************STM32F103C8T6**********************
\n * \u6587\u4ef6\u540d ：DHT11.c
\n * \u63cf\u8ff0 ：DHT11\u4f20\u611f\u5668
\n * \u5907\u6ce8 : DHT11\u6e29\u5ea6\u6e7f\u5ea6\u4f20\u611f\u5668
\n * \u63a5\u53e3 ：PA11-DATA<\/p>\n

********************LIGEN*************************\/<\/p>\n

#include "dht11.h"
\n#include "delay.h"<\/p>\n

#define DT GPIO_Pin_11<\/p>\n

\/\/\u590d\u4f4dDHT11
\nvoid DHT11_Rst(void)
\n{
\nDHT11_IO_OUT(); \/\/SET OUTPUT
\nDHT11_DQ_OUT=0; \/\/\u62c9\u4f4eDQ
\ndelay_ms(20); \/\/\u62c9\u4f4e\u81f3\u5c1118ms
\nDHT11_DQ_OUT=1; \/\/DQ=1
\ndelay_us(30); \/\/\u4e3b\u673a\u62c9\u9ad820~40us
\n}<\/p>\n

\/\/\u7b49\u5f85DHT11\u7684\u56de\u5e94
\n\/\/\u8fd4\u56de1:\u672a\u68c0\u6d4b\u5230DHT11\u7684\u5b58\u5728
\n\/\/\u8fd4\u56de0:\u5b58\u5728
\nu8 DHT11_Check(void)
\n{
\nu8 retry=0;
\nDHT11_IO_IN();\/\/SET INPUT
\n while (DHT11_DQ_IN&&retry<100)\/\/DHT11\u4f1a\u62c9\u4f4e40~80us
\n{
\nretry++;
\ndelay_us(1);
\n};
\nif(retry>=100)return 1;
\nelse retry=0;
\n while (!DHT11_DQ_IN&&retry<100)\/\/DHT11\u62c9\u4f4e\u540e\u4f1a\u518d\u6b21\u62c9\u9ad840~80us
\n{
\nretry++;
\ndelay_us(1);
\n};
\nif(retry>=100)return 1;
\nreturn 0;
\n}<\/p>\n

\/\/\u4eceDHT11\u8bfb\u53d6\u4e00\u4e2a\u4f4d
\n\/\/\u8fd4\u56de\u503c：1\/0
\nu8 DHT11_Read_Bit(void)
\n{
\n u8 retry=0;
\nwhile(DHT11_DQ_IN&&retry<100)\/\/\u7b49\u5f85\u53d8\u4e3a\u4f4e\u7535\u5e73
\n{
\nretry++;
\ndelay_us(1);
\n}
\nretry=0;
\nwhile(!DHT11_DQ_IN&&retry<100)\/\/\u7b49\u5f85\u53d8\u9ad8\u7535\u5e73
\n{
\nretry++;
\ndelay_us(1);
\n}
\ndelay_us(40);\/\/\u7b49\u5f8540us
\nif(DHT11_DQ_IN)return 1;
\nelse return 0;
\n}<\/p>\n

\/\/\u4eceDHT11\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282
\n\/\/\u8fd4\u56de\u503c：\u8bfb\u5230\u7684\u6570\u636e
\nu8 DHT11_Read_Byte(void)
\n{
\nu8 i,dat;
\ndat=0;
\nfor (i=0;i<8;i++)
\n{
\ndat<<=1;
\ndat|=DHT11_Read_Bit();
\n}
\nreturn dat;
\n}<\/p>\n

\/\/\u4eceDHT11\u8bfb\u53d6\u4e00\u6b21\u6570\u636e
\n\/\/temp:\u6e29\u5ea6\u503c(\u8303\u56f4:0~50\u00b0)
\n\/\/humi:\u6e7f\u5ea6\u503c(\u8303\u56f4:20%~90%)
\n\/\/\u8fd4\u56de\u503c：0,\u6b63\u5e38;1,\u8bfb\u53d6\u5931\u8d25
\nu8 DHT11_Read_Data(u8 *temp,u8 *humi)
\n{
\n u8 buf[5];
\nu8 i;
\nDHT11_Rst();
\nif(DHT11_Check()==0)
\n{
\nfor(i=0;i<5;i++)\/\/\u8bfb\u53d640\u4f4d\u6570\u636e
\n{
\nbuf[i]=DHT11_Read_Byte();
\n}
\nif((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
\n{
\n*humi=buf[0];
\n*temp=buf[2];
\n}
\n}
\nelse return 1;
\nreturn 0;
\n}<\/p>\n

\/\/\u521d\u59cb\u5316DHT11\u7684IO\u53e3 DQ \u540c\u65f6\u68c0\u6d4bDHT11\u7684\u5b58\u5728
\n\/\/\u8fd4\u56de1:\u4e0d\u5b58\u5728
\n\/\/\u8fd4\u56de0:\u5b58\u5728
\nu8 DHT11_Init(void)
\n{
\n GPIO_InitTypeDef GPIO_InitStructure;
\n RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); \/\/\u4f7f\u80fdPG\u7aef\u53e3\u65f6\u949f
\n GPIO_InitStructure.GPIO_Pin = DT; \/\/PG11\u7aef\u53e3\u914d\u7f6e
\n GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; \/\/\u63a8\u633d\u8f93\u51fa
\n GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
\n GPIO_Init(GPIOA, &GPIO_InitStructure); \/\/\u521d\u59cb\u5316IO\u53e3
\n GPIO_SetBits(GPIOA,DT); \/\/PG11 \u8f93\u51fa\u9ad8<\/p>\n

DHT11_Rst(); \/\/\u590d\u4f4dDHT11
\nreturn DHT11_Check();\/\/\u7b49\u5f85DHT11\u7684\u56de\u5e94
\n} <\/p>\n

5.2 DHT11.H<\/h3>\n

#ifndef DHT11_H
\n#define DHT11_H<\/p>\n

#include "sys.h"<\/p>\n

\/\/PA11
\n#define DHT11_IO_IN() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=8<<12;}
\n#define DHT11_IO_OUT() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=3<<12;}
\n\/\/IO\u64cd\u4f5c\u51fd\u6570
\n#defineDHT11_DQ_OUT PAout(11)
\n#defineDHT11_DQ_IN PAin(11) <\/p>\n

u8 DHT11_Init(void);\/\/\u521d\u59cb\u5316DHT11
\nu8 DHT11_Read_Data(u8 *temp,u8 *humi);\/\/\u8bfb\u53d6\u6570\u636e
\nu8 DHT11_Read_Byte(void);\/\/\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282
\nu8 DHT11_Read_Bit(void);\/\/\u8bfb\u53d6\u4e00\u4f4d
\nu8 DHT11_Check(void);\/\/\u68c0\u6d4bDHT11
\nvoid DHT11_Rst(void);\/\/\u590d\u4f4dDHT11 <\/p>\n

#endif<\/p>\n

5.3 \u6dfb\u52a0\u5934\u6587\u4ef6<\/h3>\n

#include "dht11.h" <\/p>\n

5.4 \u5b9a\u4e49\u53d8\u91cf<\/h3>\n

u8 temp;
\nu8 humi; <\/p>\n

\u00a05.5 \u521d\u59cb\u5316<\/h3>\n

\u5982\u679c\u521d\u59cb\u5316\u9519\u8bef\u4e32\u53e3\u8f93\u51fa\u201cDHT11 Error\u201d<\/p>\n

while(DHT11_Init())
\n{
\nprintf("DHT11 Error \\\\r\\\\n");
\ndelay_ms(1000);
\n} <\/p>\n

\u00a05.6 \u6d4b\u91cf\u6e29\u6e7f\u5ea6<\/h3>\n

\u4e32\u53e3\u8f93\u51fa\u6e29\u6e7f\u5ea6\u3002<\/p>\n

DHT11_Read_Data(&temp,&humi);
\nprintf("temp: %d C\\\\r\\\\nhumi: %d %%RH\\\\r\\\\n",temp,humi);
\n delay_ms(1000); <\/p>\n

\u4e03 \u6d4b\u91cf\u6548\u679c<\/h2>\n

temp\u8868\u793a\u6e29\u5ea6，humi\u8868\u793a\u6e7f\u5ea6\u3002<\/p>\n

\"24280f02efa14bff91064b519c2936b3.png\"<\/p>\n

\u00a0<\/p>\n

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