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258
src/main.cpp
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258
src/main.cpp
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/***************************************************
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Wemos D1 mini or NodeMCU 1.0
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VCC - 3.3V
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GND - G
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SCL - D1 -- GPIO 5
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SDA - D2 -- GPIO 4
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WAK - D3 -- GPIO 0
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ESP32
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VCC - 3.3V
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GND - G
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SCL - 19
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SDA - 18
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WAK - 23
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****************************************************/
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#include "ESPAsyncWebServer.h"
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#include <WiFi.h>
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#include <Wire.h>
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#include "ClosedCube_HDC1080.h" // HDC1080 library - https://github.com/closedcube/ClosedCube_HDC1080_Arduino // 14.04.2019
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#include "ccs811.h" // CCS811 library - https://github.com/maarten-pennings/CCS811 // 13.03.2020
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#include <time.h>
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//#include "src/ESPinfluxdb.h" // https://github.com/hwwong/ESP_influxdb // 14.04.2019
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#include "http_static.h" // HTTP pages and JSON request templates
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// ********************** Config **********************
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// DeepSleep time – send data every 60 seconds
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const int sleepTimeS = 60;
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//Global sensor objects
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#define CCS811_WAK 23
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CCS811 ccs811(CCS811_WAK);
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ClosedCube_HDC1080 hdc1080;
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// WiFi Config
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#define WiFi_SSID "Ischtar"
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#define WiFi_Password "highfive"
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// NTP conf
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const char* ntpServer = "pool.ntp.org";
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const long gmtOffset_sec = 0;
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const int daylightOffset_sec = 3600;
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// Create AsyncWebServer object on port 80
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AsyncWebServer server(80);
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// Globals for CCS811
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uint16_t eco2, etvoc, errstat, raw;
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// Globals for timestamp
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struct tm timeinfo;
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// loop cycle
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#define workCycle 60 //seconds
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// ******************** Config End ********************
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String readHDC1080Temperature() {
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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float t = hdc1080.readTemperature();
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if (isnan(t)) {
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Serial.println("Failed to read from HDC1080 sensor!");
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return "--";
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}
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else {
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return String(t);
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}
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}
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String readHDC1080Humidity() {
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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float h = hdc1080.readHumidity();
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if (isnan(h)) {
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Serial.println("Failed to read from HDC1080 sensor!");
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return "--";
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}
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else {
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return String(h);
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}
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}
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String processCCS811Error(err_t errstat) {
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if ( errstat == CCS811_ERRSTAT_OK_NODATA ) {
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Serial.println("CCS811: waiting for (new) data");
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return "loading";
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} else if ( errstat & CCS811_ERRSTAT_I2CFAIL ) {
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Serial.println("CCS811: I2C error");
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return "i2c error";
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} else {
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Serial.print("CCS811: errstat="); Serial.print(errstat, HEX);
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Serial.print("="); Serial.println( ccs811.errstat_str(errstat) );
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return "<span color='red' title='" + String(ccs811.errstat_str(errstat)) + "'>CCS811 sensor error</span>";
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}
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}
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String readCCS811TVOC() {
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return String(etvoc);
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}
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String readCCS811ECO2() {
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return String(eco2);
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}
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String formatISO8601() {
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char timestamp[20]; // Buffer for timestamp
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// Format the time into ISO 8601 format
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strftime(timestamp, sizeof(timestamp), "%Y-%m-%dT%H:%M:%SZ", &timeinfo);
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// Convert the formatted timestamp to a String object
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return String(timestamp);
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}
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// Replaces placeholder in HTML template with real values
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// SSR if you will
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String processor(const String& var){
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if(var == "TEMPERATURE"){
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return readHDC1080Temperature();
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}
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else if(var == "HUMIDITY"){
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return readHDC1080Humidity();
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}
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else if(var == "TVOC"){
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return readCCS811TVOC();
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}
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else if(var == "ECO2"){
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return readCCS811ECO2();
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} else if(var == "TIMESTAMP"){
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return formatISO8601();
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}
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return String();
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}
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void connectToWiFi() {
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WiFi.mode(WIFI_STA);
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WiFi.begin(WiFi_SSID, WiFi_Password);
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Serial.println();
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Serial.print("Connecting to WiFi: ");
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Serial.print(WiFi_SSID);
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int attempts = 0;
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while (WiFi.status() != WL_CONNECTED && attempts < 10) {
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delay(500);
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Serial.print(".");
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attempts++;
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}
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if (WiFi.status() == WL_CONNECTED) {
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Serial.println("\nWiFi connected");
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Serial.print("IP address: http://");
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Serial.println(WiFi.localIP());
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} else {
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Serial.println("\nFailed to connect to WiFi");
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// Handle connection failure, e.g., retry or reset the ESP32
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}
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}
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void setup()
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{
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Serial.begin(115200);
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delay(10);
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Serial.println("");
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connectToWiFi();
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delay(10);
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Serial.println("");
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// Config NTP
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configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
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// hdc1080 info
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hdc1080.begin(0x40);
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Serial.print("Manufacturer ID=0x");
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Serial.println(hdc1080.readManufacturerId(), HEX); // 0x5449 ID of Texas Instruments
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Serial.print("Device ID=0x");
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Serial.println(hdc1080.readDeviceId(), HEX); // 0x1050 ID of the device
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// i2c
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Wire.begin();
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Serial.println("CCS811 test");
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// Enable CCS811
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bool ok = ccs811.begin();
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if ( !ok ) Serial.println("setup: CCS811 begin FAILED");
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// Print CCS811 versions
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Serial.print("setup: hardware version: "); Serial.println(ccs811.hardware_version(), HEX);
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Serial.print("setup: bootloader version: "); Serial.println(ccs811.bootloader_version(), HEX);
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Serial.print("setup: application version: "); Serial.println(ccs811.application_version(), HEX);
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// Start measuring
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ok = ccs811.start(CCS811_MODE_1SEC);
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if ( !ok ) Serial.println("init: CCS811 start FAILED");
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// Pages and JSONs
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server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/html", http_static::index_html, processor);
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});
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server.on("/api/sensors.json", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/html", http_static::sensor_things_resp, processor);
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});
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// lightweight named endpoints
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server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/plain", readHDC1080Temperature().c_str());
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});
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server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/plain", readHDC1080Humidity().c_str());
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});
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server.on("/tvoc", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/plain", readCCS811TVOC().c_str());
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});
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server.on("/eco2", HTTP_GET, [](AsyncWebServerRequest *request){
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request->send_P(200, "text/plain", readCCS811ECO2().c_str());
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});
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// Start server
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server.begin();
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}
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void loop()
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{
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if (WiFi.status() != WL_CONNECTED) {
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Serial.println("WiFi connection lost. Reconnecting...");
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connectToWiFi();
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}
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if(!getLocalTime(&timeinfo)){
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Serial.println("Failed to obtain time");
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return;
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}
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Serial.print(&timeinfo, "[%M-%d-%Y--%H:%M:%S]: ");
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Serial.print("H="); Serial.print(readHDC1080Temperature()); Serial.print(" °C ");
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Serial.print("T="); Serial.print(readHDC1080Temperature()); Serial.print(" % ");
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// Read CCS811
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ccs811.read(&eco2,&etvoc,&errstat,&raw);
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// Process CCS811
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if( errstat==CCS811_ERRSTAT_OK ) {
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Serial.print("eco2="); Serial.print(eco2); Serial.print(" ppm ");
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Serial.print("etvoc="); Serial.print(etvoc); Serial.print(" ppb ");
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} else if( errstat==CCS811_ERRSTAT_OK_NODATA ) {
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Serial.print("waiting for (new) data");
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} else if( errstat & CCS811_ERRSTAT_I2CFAIL ) {
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Serial.print("I2C error");
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} else {
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Serial.print( "error: " );
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Serial.print( ccs811.errstat_str(errstat) );
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}
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Serial.println();
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// Wait
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delay(workCycle*1000);
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}
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