278 lines
7.9 KiB
C++
278 lines
7.9 KiB
C++
#include "SensorLogger.h"
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#include <Adafruit_AHTX0.h>
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#include <BH1750.h>
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#include <BLE2902.h>
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#include <BLEDevice.h>
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#include <BLEServer.h>
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#include <BLEUtils.h>
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#include <time.h>
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namespace {
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constexpr char kNusServiceUuid[] = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E";
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constexpr char kNusRxUuid[] = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E";
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constexpr char kNusTxUuid[] = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E";
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constexpr int64_t kInitialYear = 1700;
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constexpr int64_t kSecondsPerDay = 86400;
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Adafruit_AHTX0 aht20;
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BH1750 bh1750;
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bool aht20Ready = false;
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bool bh1750Ready = false;
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bool isLeapYear(int year) {
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return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
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}
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}
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class SensorLoggerCallbacks : public BLECharacteristicCallbacks {
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public:
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explicit SensorLoggerCallbacks(SensorLogger* logger) : logger_(logger) {}
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void onWrite(BLECharacteristic* characteristic) override {
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logger_->receiveBluetoothData(characteristic->getValue().c_str());
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}
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private:
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SensorLogger* logger_;
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};
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class SensorLoggerServerCallbacks : public BLEServerCallbacks {
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public:
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void onConnect(BLEServer*) override {}
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void onDisconnect(BLEServer* server) override {
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server->startAdvertising();
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}
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};
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void SensorLogger::begin(uint8_t soilPin) {
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soilPin_ = soilPin;
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pinMode(soilPin_, INPUT);
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analogReadResolution(12);
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aht20Ready = aht20.begin();
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bh1750Ready = bh1750.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
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uint64_t mac = ESP.getEfuseMac();
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char name[14];
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snprintf(name, sizeof(name), "EnvLog-%05llX", mac & 0xFFFFF);
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bluetoothName_ = name;
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BLEDevice::init(bluetoothName_.c_str());
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server_ = BLEDevice::createServer();
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server_->setCallbacks(new SensorLoggerServerCallbacks());
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BLEService* service = server_->createService(kNusServiceUuid);
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BLECharacteristic* rxCharacteristic = service->createCharacteristic(
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kNusRxUuid, BLECharacteristic::PROPERTY_WRITE | BLECharacteristic::PROPERTY_WRITE_NR);
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rxCharacteristic->setCallbacks(new SensorLoggerCallbacks(this));
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txCharacteristic_ = service->createCharacteristic(
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kNusTxUuid, BLECharacteristic::PROPERTY_NOTIFY);
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txCharacteristic_->addDescriptor(new BLE2902());
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service->start();
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BLEAdvertising* advertising = BLEDevice::getAdvertising();
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advertising->addServiceUUID(kNusServiceUuid);
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advertising->setScanResponse(true);
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advertising->setMinPreferred(0x06);
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advertising->setMinPreferred(0x12);
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BLEDevice::startAdvertising();
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readAndStore();
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lastMeasure_ = millis();
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}
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bool SensorLogger::update() {
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processBluetooth();
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unsigned long now = millis();
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if (now - lastMeasure_ >= kMeasureIntervalMs) {
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lastMeasure_ = now;
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readAndStore();
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return true;
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}
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return false;
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}
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const SensorReading& SensorLogger::latest() const {
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return latest_;
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}
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bool SensorLogger::hasReading() const {
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return logCount_ != 0;
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}
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size_t SensorLogger::logCount() const {
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return logCount_;
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}
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bool SensorLogger::getCurrentTime(char* buffer, size_t bufferSize) const {
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if (bufferSize == 0) {
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return false;
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}
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int64_t timestamp = currentTimestamp();
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if (timeSynchronized_) {
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time_t unixTimestamp = static_cast<time_t>(timestamp);
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struct tm date;
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localtime_r(&unixTimestamp, &date);
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strftime(buffer, bufferSize, "%Y/%m/%d %H:%M:%S", &date);
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return true;
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}
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int year = static_cast<int>(kInitialYear);
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int month = 1;
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int day = 1;
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int64_t days = timestamp / kSecondsPerDay;
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int seconds = static_cast<int>(timestamp % kSecondsPerDay);
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while (days >= (isLeapYear(year) ? 366 : 365)) {
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days -= isLeapYear(year) ? 366 : 365;
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++year;
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}
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const int daysInMonth[] = {
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31, isLeapYear(year) ? 29 : 28, 31, 30, 31, 30,
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31, 31, 30, 31, 30, 31
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};
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while (days >= daysInMonth[month - 1]) {
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days -= daysInMonth[month - 1];
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++month;
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}
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day += static_cast<int>(days);
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snprintf(buffer, bufferSize, "%04d/%02d/%02d %02d:%02d:%02d",
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year, month, day, seconds / 3600, (seconds / 60) % 60, seconds % 60);
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return true;
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}
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void SensorLogger::readAndStore() {
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sensors_event_t humidityEvent;
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sensors_event_t temperatureEvent;
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SensorReading reading = {};
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if (aht20Ready) {
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aht20.getEvent(&humidityEvent, &temperatureEvent);
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reading.temperature = temperatureEvent.temperature;
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reading.humidity = humidityEvent.relative_humidity;
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}
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if (bh1750Ready) {
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reading.illuminance = bh1750.readLightLevel();
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}
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reading.soilMoisture = analogRead(soilPin_);
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reading.timestamp = currentTimestamp();
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latest_ = reading;
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size_t writeIndex = (logStart_ + logCount_) % kMaxLogEntries;
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if (logCount_ == kMaxLogEntries) {
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log_[logStart_] = reading;
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logStart_ = (logStart_ + 1) % kMaxLogEntries;
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} else {
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log_[writeIndex] = reading;
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++logCount_;
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}
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}
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void SensorLogger::processBluetooth() {
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while (commandBuffer_.indexOf('\n') >= 0 || commandBuffer_.indexOf('\r') >= 0) {
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int lineEnd = commandBuffer_.indexOf('\n');
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int carriageReturn = commandBuffer_.indexOf('\r');
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if (lineEnd < 0 || (carriageReturn >= 0 && carriageReturn < lineEnd)) {
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lineEnd = carriageReturn;
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}
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String command = commandBuffer_.substring(0, lineEnd);
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commandBuffer_.remove(0, lineEnd + 1);
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if (command.length() != 0) {
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processCommand(command);
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}
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}
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}
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void SensorLogger::receiveBluetoothData(const String& data) {
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for (size_t index = 0; index < data.length(); ++index) {
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char character = data[index];
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if (character == '\n' || character == '\r') {
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commandBuffer_ += character;
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} else if (commandBuffer_.length() < 64) {
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commandBuffer_ += character;
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}
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}
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}
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void SensorLogger::processCommand(const String& command) {
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if (command == "GET_LOG") {
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sendLog();
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} else if (command == "CLEAR_LOG") {
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clearLog();
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txCharacteristic_->setValue("OK_CLEARED\n");
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txCharacteristic_->notify();
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} else if (command.startsWith("TIME:")) {
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unsigned long epoch = command.substring(5).toInt();
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unsigned int year;
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unsigned int month;
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unsigned int day;
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unsigned int hour;
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unsigned int minute;
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unsigned int second;
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if (sscanf(command.c_str(), "TIME:[%u,%u,%u,%u,%u,%u]",
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&year, &month, &day, &hour, &minute, &second) == 6) {
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struct tm date = {};
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date.tm_year = year - 1900;
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date.tm_mon = month - 1;
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date.tm_mday = day;
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date.tm_hour = hour;
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date.tm_min = minute;
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date.tm_sec = second;
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epoch = static_cast<unsigned long>(mktime(&date));
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}
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if (epoch != 0) {
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epochOffset_ = epoch - millis() / 1000UL;
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timeSynchronized_ = true;
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txCharacteristic_->setValue("OK_TIME\n");
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txCharacteristic_->notify();
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} else {
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txCharacteristic_->setValue("ERROR_TIME\n");
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txCharacteristic_->notify();
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}
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}
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}
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void SensorLogger::sendLog() {
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sendNotification("timestamp,temp,humid,light,soil,device\n");
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for (size_t index = 0; index < logCount_; ++index) {
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size_t logIndex = (logStart_ + index) % kMaxLogEntries;
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const SensorReading& reading = log_[logIndex];
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char line[128];
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snprintf(line, sizeof(line), "%lld,%.2f,%.2f,%.2f,%u,%s\n",
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reading.timestamp,
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reading.temperature,
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reading.humidity,
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reading.illuminance,
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reading.soilMoisture,
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bluetoothName_.c_str());
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sendNotification(line);
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delay(20);
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}
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sendNotification("END_LOG\n");
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}
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void SensorLogger::sendNotification(const char* data) {
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constexpr size_t kNotificationSize = 20;
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uint8_t notification[kNotificationSize];
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size_t length = strlen(data);
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for (size_t offset = 0; offset < length; offset += kNotificationSize) {
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size_t chunkSize = min(kNotificationSize, length - offset);
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memcpy(notification, data + offset, chunkSize);
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txCharacteristic_->setValue(notification, chunkSize);
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txCharacteristic_->notify();
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delay(10);
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}
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}
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void SensorLogger::clearLog() {
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logStart_ = 0;
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logCount_ = 0;
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}
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int64_t SensorLogger::currentTimestamp() const {
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int64_t elapsedSeconds = millis() / 1000UL;
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return timeSynchronized_ ? epochOffset_ + elapsedSeconds : elapsedSeconds;
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}
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