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AirGradient_Prometheus/DIY_PRO_V3_7_Prometheus.ino

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// Works with AirGradient library version 2.4.15
#include <AirGradient.h>
#include <WiFiManager.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <EEPROM.h>
//#include "SGP30.h"
#include <SensirionI2CSgp41.h>
#include <NOxGasIndexAlgorithm.h>
#include <VOCGasIndexAlgorithm.h>
#include <U8g2lib.h>
AirGradient ag = AirGradient();
SensirionI2CSgp41 sgp41;
VOCGasIndexAlgorithm voc_algorithm;
NOxGasIndexAlgorithm nox_algorithm;
// time in seconds needed for NOx conditioning
uint16_t conditioning_s = 10;
// for peristent saving and loading
int addr = 4;
byte value;
// Display bottom right
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
// Replace above if you have display on top left
//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* reset=*/ U8X8_PIN_NONE);
// CONFIGURATION START
//set to the endpoint you would like to use
String APIROOT = "http://hw.airgradient.com/";
// set to true to switch from Celcius to Fahrenheit
boolean inF = false;
// PM2.5 in US AQI (default ug/m3)
boolean inUSAQI = false;
// Display Position
boolean displayTop = true;
// set to true if you want to connect to wifi. You have 60 seconds to connect. Then it will go into an offline mode.
boolean connectWIFI=true;
// CONFIGURATION END
unsigned long currentMillis = 0;
const int oledInterval = 5000;
unsigned long previousOled = 0;
const int sendToServerInterval = 10000;
unsigned long previoussendToServer = 0;
const int tvocInterval = 1000;
unsigned long previousTVOC = 0;
int TVOC = 0;
int NOX = 0;
const int co2Interval = 5000;
unsigned long previousCo2 = 0;
int Co2 = 0;
const int pm25Interval = 5000;
unsigned long previousPm25 = 0;
int pm25 = 0;
const int tempHumInterval = 2500;
unsigned long previousTempHum = 0;
float temp = 0;
int hum = 0;
int buttonConfig=4;
int lastState = LOW;
int currentState;
unsigned long pressedTime = 0;
unsigned long releasedTime = 0;
String payload = "";
//Custom stuff
int port = 9091;
ESP8266WebServer server(port);
void setup() {
Serial.begin(115200);
Serial.println("Hello");
u8g2.begin();
//u8g2.setDisplayRotation(U8G2_R0);
EEPROM.begin(512);
delay(500);
buttonConfig = String(EEPROM.read(addr)).toInt();
setConfig();
updateOLED2("Press Button", "Now for", "Config Menu");
delay(2000);
currentState = digitalRead(D7);
if (currentState == HIGH)
{
updateOLED2("Entering", "Config Menu", "");
delay(3000);
lastState = LOW;
inConf();
}
if (connectWIFI)
{
connectToWifi();
}
updateOLED2("Warming Up", "Serial Number:", String(ESP.getChipId(), HEX));
sgp41.begin(Wire);
ag.CO2_Init();
ag.PMS_Init();
ag.TMP_RH_Init(0x44);
//Custom
server.on("/", HandleRoot);
server.on("/metrics", HandleRoot);
server.onNotFound(HandleNotFound);
server.begin();
Serial.println("HTTP server started at ip " + WiFi.localIP().toString() + ":" + String(port));
}
void loop() {
currentMillis = millis();
updateTVOC();
updateOLED();
updateCo2();
updatePm25();
updateTempHum();
sendToServer();
//Custom
server.handleClient();
}
//Custom
void HandleRoot() {
server.send(200, "text/plain", GenerateMetrics() );
}
void HandleNotFound() {
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET) ? "GET" : "POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint i = 0; i < server.args(); i++) {
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/html", message);
}
String GenerateMetrics() {
String message = "";
String idString = "{id=\"" + String(ESP.getChipId(), HEX) + "\",mac=\"" + WiFi.macAddress().c_str() + "\"}";
//PM
message += "# HELP pm02 Particulate Matter PM2.5 value, in micrograms per cubic meter\n";
message += "# TYPE pm02 gauge\n";
message += "pm02";
message += idString;
message += String(pm25);
message += "\n";
//co2
message += "# HELP rco2 CO2 value, in ppm\n";
message += "# TYPE rco2 gauge\n";
message += "rco2";
message += idString;
message += String(Co2);
message += "\n";
//Temp
message += "# HELP atmp Temperature, in degrees Celsius\n";
message += "# TYPE atmp gauge\n";
message += "atmp";
message += idString;
message += String(temp);
message += "\n";
//Humidity
message += "# HELP rhum Relative humidity, in percent\n";
message += "# TYPE rhum gauge\n";
message += "rhum";
message += idString;
message += String(hum);
message += "\n";
//NOX
message += "# HELP nox Exhaust gases, in ppmv\n";
message += "# TYPE nox gauge\n";
message += "nox";
message += idString;
message += String(NOX);
message += "\n";
//TVOC
message += "# HELP tvoc Total Volatile Organic Compounds, based on relative index 30\n";
message += "# TYPE tvoc gauge\n";
message += "tvoc";
message += idString;
message += String(TVOC);
message += "\n";
//DONE NOX TVOC pm25 Co2 temp hum
return message;
}
void inConf(){
setConfig();
currentState = digitalRead(D7);
if(lastState == LOW && currentState == HIGH) {
pressedTime = millis();
}
else if(lastState == HIGH && currentState == LOW) {
releasedTime = millis();
long pressDuration = releasedTime - pressedTime;
if( pressDuration < 1000 ) {
buttonConfig=buttonConfig+1;
if (buttonConfig>7) buttonConfig=0;
}
}
if (lastState == HIGH && currentState == HIGH){
long passedDuration = millis() - pressedTime;
if( passedDuration > 4000 ) {
// to do
// if (buttonConfig==4) {
// updateOLED2("Saved", "Release", "Button Now");
// delay(1000);
// updateOLED2("Starting", "CO2", "Calibration");
// delay(1000);
// Co2Calibration();
// } else {
updateOLED2("Saved", "Release", "Button Now");
delay(1000);
updateOLED2("Rebooting", "in", "5 seconds");
delay(5000);
EEPROM.write(addr, char(buttonConfig));
EEPROM.commit();
delay(1000);
ESP.restart();
// }
}
}
lastState = currentState;
delay(100);
inConf();
}
void setConfig() {
if (buttonConfig == 0) {
updateOLED2("Temp. in C", "PM in ug/m3", "Display Top");
u8g2.setDisplayRotation(U8G2_R2);
inF = false;
inUSAQI = false;
}
if (buttonConfig == 1) {
updateOLED2("Temp. in C", "PM in US AQI", "Display Top");
u8g2.setDisplayRotation(U8G2_R2);
inF = false;
inUSAQI = true;
}
if (buttonConfig == 2) {
updateOLED2("Temp. in F", "PM in ug/m3", "Display Top");
u8g2.setDisplayRotation(U8G2_R2);
inF = true;
inUSAQI = false;
}
if (buttonConfig == 3) {
updateOLED2("Temp. in F", "PM in US AQI", "Display Top");
u8g2.setDisplayRotation(U8G2_R2);
inF = true;
inUSAQI = true;
}
if (buttonConfig == 4) {
updateOLED2("Temp. in C", "PM in ug/m3", "Display Bottom");
u8g2.setDisplayRotation(U8G2_R0);
inF = false;
inUSAQI = false;
}
if (buttonConfig == 5) {
updateOLED2("Temp. in C", "PM in US AQI", "Display Bottom");
u8g2.setDisplayRotation(U8G2_R0);
inF = false;
inUSAQI = true;
}
if (buttonConfig == 6) {
updateOLED2("Temp. in F", "PM in ug/m3", "Display Bottom");
u8g2.setDisplayRotation(U8G2_R0);
inF = true;
inUSAQI = false;
}
if (buttonConfig == 7) {
updateOLED2("Temp. in F", "PM in US AQI", "Display Bottom");
u8g2.setDisplayRotation(U8G2_R0);
inF = true;
inUSAQI = true;
}
// to do
// if (buttonConfig == 8) {
// updateOLED2("CO2", "Manual", "Calibration");
// }
}
void updateTVOC()
{
uint16_t error;
char errorMessage[256];
uint16_t defaultRh = 0x8000;
uint16_t defaultT = 0x6666;
uint16_t srawVoc = 0;
uint16_t srawNox = 0;
uint16_t defaultCompenstaionRh = 0x8000; // in ticks as defined by SGP41
uint16_t defaultCompenstaionT = 0x6666; // in ticks as defined by SGP41
uint16_t compensationRh = 0; // in ticks as defined by SGP41
uint16_t compensationT = 0; // in ticks as defined by SGP41
delay(1000);
compensationT = static_cast<uint16_t>((temp + 45) * 65535 / 175);
compensationRh = static_cast<uint16_t>(hum * 65535 / 100);
if (conditioning_s > 0) {
error = sgp41.executeConditioning(compensationRh, compensationT, srawVoc);
conditioning_s--;
} else {
error = sgp41.measureRawSignals(compensationRh, compensationT, srawVoc,
srawNox);
}
if (currentMillis - previousTVOC >= tvocInterval) {
previousTVOC += tvocInterval;
TVOC = voc_algorithm.process(srawVoc);
NOX = nox_algorithm.process(srawNox);
Serial.println(String(TVOC));
}
}
void updateCo2()
{
if (currentMillis - previousCo2 >= co2Interval) {
previousCo2 += co2Interval;
Co2 = ag.getCO2_Raw();
Serial.println(String(Co2));
}
}
void updatePm25()
{
if (currentMillis - previousPm25 >= pm25Interval) {
previousPm25 += pm25Interval;
pm25 = ag.getPM2_Raw();
Serial.println(String(pm25));
}
}
void updateTempHum()
{
if (currentMillis - previousTempHum >= tempHumInterval) {
previousTempHum += tempHumInterval;
TMP_RH result = ag.periodicFetchData();
temp = result.t;
hum = result.rh;
Serial.println(String(temp));
}
}
void updateOLED() {
if (currentMillis - previousOled >= oledInterval) {
previousOled += oledInterval;
String ln3;
String ln1;
if (inUSAQI) {
ln1 = "AQI:" + String(PM_TO_AQI_US(pm25)) + " CO2:" + String(Co2);
} else {
ln1 = "PM:" + String(pm25) + " CO2:" + String(Co2);
}
String ln2 = "TVOC:" + String(TVOC) + " NOX:" + String(NOX);
if (inF) {
ln3 = "F:" + String((temp* 9 / 5) + 32) + " H:" + String(hum)+"%";
} else {
ln3 = "C:" + String(temp) + " H:" + String(hum)+"%";
}
updateOLED2(ln1, ln2, ln3);
}
}
void updateOLED2(String ln1, String ln2, String ln3) {
char buf[9];
u8g2.firstPage();
u8g2.firstPage();
do {
u8g2.setFont(u8g2_font_t0_16_tf);
u8g2.drawStr(1, 10, String(ln1).c_str());
u8g2.drawStr(1, 30, String(ln2).c_str());
u8g2.drawStr(1, 50, String(ln3).c_str());
} while ( u8g2.nextPage() );
}
void sendToServer() {
if (currentMillis - previoussendToServer >= sendToServerInterval) {
previoussendToServer += sendToServerInterval;
payload = "{\"wifi\":" + String(WiFi.RSSI())
+ (Co2 < 0 ? "" : ", \"rco2\":" + String(Co2))
+ (pm25 < 0 ? "" : ", \"pm02\":" + String(pm25))
+ (TVOC < 0 ? "" : ", \"tvoc_index\":" + String(TVOC))
+ (NOX < 0 ? "" : ", \"nox_index\":" + String(NOX))
+ ", \"atmp\":" + String(temp)
+ (hum < 0 ? "" : ", \"rhum\":" + String(hum))
+ "}";
if(WiFi.status()== WL_CONNECTED){
Serial.println(payload);
String POSTURL = APIROOT + "sensors/airgradient:" + String(ESP.getChipId(), HEX) + "/measures";
Serial.println(POSTURL);
WiFiClient client;
HTTPClient http;
http.begin(client, POSTURL);
http.addHeader("content-type", "application/json");
int httpCode = http.POST(payload);
String response = http.getString();
Serial.println(httpCode);
Serial.println(response);
http.end();
}
else {
Serial.println("WiFi Disconnected");
}
}
}
// Wifi Manager
void connectToWifi() {
WiFiManager wifiManager;
//WiFi.disconnect(); //to delete previous saved hotspot
String HOTSPOT = "AG-" + String(ESP.getChipId(), HEX);
updateOLED2("90s to connect", "to Wifi Hotspot", HOTSPOT);
wifiManager.setTimeout(90);
if (!wifiManager.autoConnect((const char * ) HOTSPOT.c_str())) {
updateOLED2("booting into", "offline mode", "");
Serial.println("failed to connect and hit timeout");
delay(6000);
}
}
// Calculate PM2.5 US AQI
int PM_TO_AQI_US(int pm02) {
if (pm02 <= 12.0) return ((50 - 0) / (12.0 - .0) * (pm02 - .0) + 0);
else if (pm02 <= 35.4) return ((100 - 50) / (35.4 - 12.0) * (pm02 - 12.0) + 50);
else if (pm02 <= 55.4) return ((150 - 100) / (55.4 - 35.4) * (pm02 - 35.4) + 100);
else if (pm02 <= 150.4) return ((200 - 150) / (150.4 - 55.4) * (pm02 - 55.4) + 150);
else if (pm02 <= 250.4) return ((300 - 200) / (250.4 - 150.4) * (pm02 - 150.4) + 200);
else if (pm02 <= 350.4) return ((400 - 300) / (350.4 - 250.4) * (pm02 - 250.4) + 300);
else if (pm02 <= 500.4) return ((500 - 400) / (500.4 - 350.4) * (pm02 - 350.4) + 400);
else return 500;
};
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