【得捷电子Follow me第3期】任务汇总|综合实践：无线扩展温湿度计第二屏！！！

alanlan86

【得捷电子Follow me第3期】任务汇总|综合实践：无线扩展温湿度计第二屏！！！ [复制链接]

<i class="pstatus"> 本帖最后由 alanlan86 于 2023-12-23 20:34 编辑 </i> # 第一部分 <div id="player_72a9c5baeae54b3a63450807a11a93420" class="localvideo-box"></div><div class="localvideo-title">温湿度采集2</div><br/> 演示采用ESP32-C3 XIAO采集小米温湿度计（小米生态链企业青萍的Goose）！ # 第二部分 - 任务汇总： - [【得捷电子Follow me第3期】任务1：使用MicroPython系统|开箱帖](https://bbs.eeworld.com.cn/thread-1263490-1-1.html "【得捷电子Follow me第3期】任务1：使用MicroPython系统|开箱帖") - [【得捷电子Follow me第3期】任务2：驱动扩展板上的OLED屏幕|字符&中文](https://bbs.eeworld.com.cn/thread-1263808-1-1.html " 【得捷电子Follow me第3期】任务2：驱动扩展板上的OLED屏幕|字符&中文") - [【得捷电子FollowMe第3期】任务3：控制蜂鸣器播放音乐|刷动画](https://bbs.eeworld.com.cn/thread-1263806-1-1.html "【得捷电子FollowMe第3期】任务3：控制蜂鸣器播放音乐|刷动画") - [【得捷电子Follow me第3期】任务4：连接WiFi网络|同步网络时间](【得捷电子FollowMe第3期】任务3：控制蜂鸣器播放音乐|刷动画 "【得捷电子Follow me第3期】任务4：连接WiFi网络|同步网络时间") - [ 【得捷电子Follow me第3期】任务5：使用外部传感器|电阻测温度](https://bbs.eeworld.com.cn/thread-1263816-1-1.html " 【得捷电子Follow me第3期】任务5：使用外部传感器|电阻测温度") - [【得捷电子Follow m3第3期】任务6：综合实践|WiFi信号追踪](https://bbs.eeworld.com.cn/thread-1263822-1-1.html "【得捷电子Follow m3第3期】任务6：综合实践|WiFi信号追踪") - [ 【得捷电子Follow m3第3期】任务6：综合实践|圆屏点亮时钟界面](https://bbs.eeworld.com.cn/thread-1265632-1-1.html " 【得捷电子Follow m3第3期】任务6：综合实践|圆屏点亮时钟界面") # 第三部分 ## 综合实践 - 感谢EEWrorld和得捷电子提供的机会，Follow Me 3 有幸获得参加机会！所以除了继续体验ESP32+Micropython之外，也开始上手试玩一下Arduino（PlaftormIO）。 ### 简介 - 设计动机：最近寒潮来袭，广东也是瞬间入冬！看看家里的温湿度计，瞬间想到，如果在客厅壁挂了温湿度计，想在卧室看看温度，还得跑出去，瞬间发挥“码农”的动力————手搓一个温湿度显示第二屏！！！ - 后话：如果把蓝牙测温计，丢小孩的被窝里面，如果晚上踢被子，就可以在另外的卧室进行连线“闹醒”！ :Onion-5:瞬间很理工男了~~~~ ### 硬件 #### 核心硬件： - 小巧强大的ESP32-C3 XIAO  #### 扩展板+OLED显示： - （泪崩，扩展板上OLED烧坏了！只能通过I2C扩展了Follow me 1期的OLED显示板）  #### 青萍温湿度计  ### 软件 #### A、开发环境 采用VSCode+PlatformIO，将ESP32-C3的开发环境搭建好。 #### B、代码库 采用了NimBLE-Arduino，OLED显示的代码库u8g2 ```c [env:seeed_xiao_esp32c3] platform = espressif32 board = seeed_xiao_esp32c3 framework = arduino lib_deps = h2zero/NimBLE-Arduino@^1.4.1 olikraus/U8g2@^2.35.8 ``` #### C、蓝牙代码 - 参考example code里面的BLE Client例程进行修改。作为client端需要将蓝牙扫描打开，同时，由于温湿度计连接无需做配对，所以需要将配对代码部分接口调用注释掉。 #### ①初始化客户端 ```cpp void setup (){ Serial.begin(115200); Serial.println("Starting NimBLE Client"); u8g2.begin(); //u8g2.setFlipMode(1); // set number from 1 to 3, the screen word will rotary 180 u8g2.clearBuffer(); // clear the internal memory u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font u8g2.drawStr(0,15,"Goose Sensor"); // write something to the internal memory u8g2.drawStr(0,30,"Start..."); u8g2.drawStr(0,40,"BLE Scan.."); u8g2.sendBuffer(); // transfer internal memory to the display /** Initialize NimBLE, no device name spcified as we are not advertising */ NimBLEDevice::init(""); /** Set the IO capabilities of the device, each option will trigger a different pairing method. * BLE_HS_IO_KEYBOARD_ONLY - Passkey pairing * BLE_HS_IO_DISPLAY_YESNO - Numeric comparison pairing * BLE_HS_IO_NO_INPUT_OUTPUT - DEFAULT setting - just works pairing */ //NimBLEDevice::setSecurityIOCap(BLE_HS_IO_KEYBOARD_ONLY); // use passkey //NimBLEDevice::setSecurityIOCap(BLE_HS_IO_DISPLAY_YESNO); //use numeric comparison /** 2 different ways to set security - both calls achieve the same result. * no bonding, no man in the middle protection, secure connections. * * These are the default values, only shown here for demonstration. */ //NimBLEDevice::setSecurityAuth(false, false, true); //NimBLEDevice::setSecurityAuth(/*BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM |*/ BLE_SM_PAIR_AUTHREQ_SC); /** Optional: set the transmit power, default is 3db */ #ifdef ESP_PLATFORM NimBLEDevice::setPower(ESP_PWR_LVL_P9); /** +9db */ #else NimBLEDevice::setPower(9); /** +9db */ #endif /** Optional: set any devices you don't want to get advertisments from */ // NimBLEDevice::addIgnored(NimBLEAddress ("aa:bb:cc:dd:ee:ff")); /** create new scan */ NimBLEScan* pScan = NimBLEDevice::getScan(); /** create a callback that gets called when advertisers are found */ pScan->setAdvertisedDeviceCallbacks(new AdvertisedDeviceCallbacks()); /** Set scan interval (how often) and window (how long) in milliseconds */ pScan->setInterval(500); pScan->setWindow(450); /** Active scan will gather scan response data from advertisers * but will use more energy from both devices */ pScan->setActiveScan(true); /** Start scanning for advertisers for the scan time specified (in seconds) 0 = forever * Optional callback for when scanning stops. */ pScan->start(scanTime, scanEndedCB); } ``` #### ②扫描及连接 - 考虑到扫描->连接的时间效率，将scan的window和interval做一下调整！ - 通过扫描获得周边广播设备（server端）的广播内容。此处，调整一下例程原有通过service uuid进行匹配的规则，采用DeviceName=Goose进行匹配，然后决定发起连接。 ```cpp /** Define a class to handle the callbacks when advertisments are received */ class AdvertisedDeviceCallbacks: public NimBLEAdvertisedDeviceCallbacks { void onResult(NimBLEAdvertisedDevice* advertisedDevice) { Serial.print("Advertised Device found: "); Serial.println(advertisedDevice->toString().c_str()); //if(advertisedDevice->isAdvertisingService(NimBLEUUID(SERVICE_UUID))) if (advertisedDevice->getName() == "Goose") { Serial.println("Found Our Service"); /** stop scan before connecting */ NimBLEDevice::getScan()->stop(); /** Save the device reference in a global for the client to use*/ advDevice = advertisedDevice; /** Ready to connect now */ doConnect = true; } }; }; ``` #### ③匹配Server端 - 通过扫描&连接后，对目标设备发起连接，则需要继续匹配Server端的service uuid和characteristic的uuid，主要代码在connectToServer()函数中。 ```cpp void loop (){ /** Loop here until we find a device we want to connect to */ while(!doConnect){ delay(1); } doConnect = false; /** Found a device we want to connect to, do it now */ if(connectToServer()) { Serial.println("Success! we should now be getting notifications, scanning for more!"); } else { Serial.println("Failed to connect, starting scan"); } //NimBLEDevice::getScan()->start(scanTime,scanEndedCB); } ``` - connectToServer()函数主要匹配服务及特征值部分代码。调整服务UUID，匹配特征值UUID的主要内容，是实现和温湿度计匹配的关键代码。。 ```cpp /** Handles the provisioning of clients and connects / interfaces with the server */ bool connectToServer() { NimBLEClient* pClient = nullptr; /** Check if we have a client we should reuse first **/ if(NimBLEDevice::getClientListSize()) { /** Special case when we already know this device, we send false as the * second argument in connect() to prevent refreshing the service database. * This saves considerable time and power. */ pClient = NimBLEDevice::getClientByPeerAddress(advDevice->getAddress()); if(pClient){ if(!pClient->connect(advDevice, false)) { Serial.println("Reconnect failed"); return false; } Serial.println("Reconnected client"); } /** We don't already have a client that knows this device, * we will check for a client that is disconnected that we can use. */ else { pClient = NimBLEDevice::getDisconnectedClient(); } } /** No client to reuse? Create a new one. */ if(!pClient) { if(NimBLEDevice::getClientListSize() >= NIMBLE_MAX_CONNECTIONS) { Serial.println("Max clients reached - no more connections available"); return false; } pClient = NimBLEDevice::createClient(); Serial.println("New client created"); pClient->setClientCallbacks(&clientCB, false); /** Set initial connection parameters: These settings are 15ms interval, 0 latency, 120ms timout. * These settings are safe for 3 clients to connect reliably, can go faster if you have less * connections. Timeout should be a multiple of the interval, minimum is 100ms. * Min interval: 12 * 1.25ms = 15, Max interval: 12 * 1.25ms = 15, 0 latency, 51 * 10ms = 510ms timeout */ pClient->setConnectionParams(12,12,0,51); /** Set how long we are willing to wait for the connection to complete (seconds), default is 30. */ pClient->setConnectTimeout(5); if (!pClient->connect(advDevice)) { /** Created a client but failed to connect, don't need to keep it as it has no data */ NimBLEDevice::deleteClient(pClient); Serial.println("Failed to connect, deleted client"); return false; } } if(!pClient->isConnected()) { if (!pClient->connect(advDevice)) { Serial.println("Failed to connect"); return false; } } Serial.print("Connected to: "); Serial.println(pClient->getPeerAddress().toString().c_str()); Serial.print("RSSI: "); Serial.println(pClient->getRssi()); /** Now we can read/write/subscribe the charateristics of the services we are interested in */ NimBLERemoteService* pSvc = nullptr; NimBLERemoteCharacteristic* pChr = nullptr; NimBLERemoteDescriptor* pDsc = nullptr; pSvc = pClient->getService(SERVICE_UUID); if(pSvc) { /** make sure it's not null */ pChr = pSvc->getCharacteristic(CHAR_UUID); if(pChr) { /** make sure it's not null */ if(pChr->canRead()) { Serial.print(pChr->getUUID().toString().c_str()); Serial.print(" Value: "); Serial.println(pChr->readValue().c_str()); } if(pChr->canWrite()) { if(pChr->writeValue("Tasty")) { Serial.print("Wrote new value to: "); Serial.println(pChr->getUUID().toString().c_str()); } else { /** Disconnect if write failed */ pClient->disconnect(); return false; } if(pChr->canRead()) { Serial.print("The value of: "); Serial.print(pChr->getUUID().toString().c_str()); Serial.print(" is now: "); Serial.println(pChr->readValue().c_str()); } } /** registerForNotify() has been deprecated and replaced with subscribe() / unsubscribe(). * Subscribe parameter defaults are: notifications=true, notifyCallback=nullptr, response=false. * Unsubscribe parameter defaults are: response=false. */ if(pChr->canNotify()) { //if(!pChr->registerForNotify(notifyCB)) { if(!pChr->subscribe(true, notifyCB)) { /** Disconnect if subscribe failed */ pClient->disconnect(); return false; } } else if(pChr->canIndicate()) { /** Send false as first argument to subscribe to indications instead of notifications */ //if(!pChr->registerForNotify(notifyCB, false)) { if(!pChr->subscribe(false, notifyCB)) { /** Disconnect if subscribe failed */ pClient->disconnect(); return false; } } } } else { Serial.println("Goose Sensor service not found."); } Serial.println("Done with this device!"); return true; } ``` ##### ④接收温湿度 - 接收温湿度计通知Notify的温湿度数值，并做OLED显示。 ```cpp /** Notification / Indication receiving handler callback */ void notifyCB(NimBLERemoteCharacteristic* pRemoteCharacteristic, uint8_t* pData, size_t length, bool isNotify){ uint16_t humidity, temperature; char data[64]; std::string str = (isNotify == true) ? "Notification" : "Indication"; str += " from "; temperature = (pData[3] << 8)|(pData[2] << 0); humidity = (pData[5] << 8)|(pData[4] << 0); //Serial.printf("rx data:0x%x,0x%x,", pData[0], pData[1]); snprintf(data, sizeof(data), "humidity=%d,temperature=%d\r\n", humidity&(~(1 << 15)), temperature); /** NimBLEAddress and NimBLEUUID have std::string operators */ str += std::string(pRemoteCharacteristic->getRemoteService()->getClient()->getPeerAddress()); str += ": Service = " + std::string(pRemoteCharacteristic->getRemoteService()->getUUID()); str += ", Characteristic = " + std::string(pRemoteCharacteristic->getUUID()); //str += ", Value = " + std::string((char*)pData, length); str += data; Serial.println(str.c_str()); //display on OLED screen u8g2.clearBuffer(); // clear the internal memory u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font u8g2.drawStr(0,15,"Goose Sensor"); // write something to the internal memory u8g2.drawStr(0,30,"Get Data..."); snprintf(data, sizeof(data), "temperature:%.01f", float(temperature/10.0)); u8g2.drawStr(0,40,data); snprintf(data, sizeof(data), "himidity:%.01f", float(humidity/10.0)); u8g2.drawStr(0,50,data); u8g2.sendBuffer(); // transfer internal memory to the display } ``` ### 调试 - 代码烧录后，可以由ESP32-C3 对温湿度计进行连接，且可以获取到温湿度计，通过串口打印。 <ignore_js_op> <img src="data/attachment/forum/202312/23/202023jajlc1wua2jecacz.jpg" alt="温湿度.JPG" title="温湿度.JPG" /> </ignore_js_op> - 温湿度获取后OLED显示。 <ignore_js_op> <img src="data/attachment/forum/202312/23/202040uav4lvhaantcvv84.jpg" alt="温湿度显示.jpg" title="温湿度显示.jpg" /> </ignore_js_op> ### 源码 <ignore_js_op> <img src="static/image/filetype/zip.gif" border="0" class="vm" alt="" /> <span style="white-space: nowrap" id="attach_767012" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})"> <a href="javascript:;" class="loginf">BLEDemo.zip</a> <em class="xg1">(11.95 MB, 下载次数: 0)</em> </span> <div class="tip tip_4" id="attach_767012_menu" style="position: absolute; display: none" disautofocus="true"> <div class="tip_c xs0"> <div class="y">2023-12-23 20:24 上传</div> 点击文件名下载附件 源码 </ignore_js_op> ### 总结 - 动手永远是乐趣的起点！因此follow me第4期，也开始了！希望能够继续有机会参加活动，可以接触上手更多好玩有趣的小玩儿！~~~感谢EEWorld提供的平台，得捷电子的赞助支持！ :Onion-8: :Onion-8: :Onion-19: :Onion-19: