2024-03-13 17:56:09 +01:00
3 changed files with 256 additions and 2 deletions

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#include "arduino.h"
#include "nodeCodeHeader.h"
nodeReadings::nodeReadings() {
}
void nodeReadings::resetValues() {
counter = 0;
eCO2 = 0;
TVOC = 0;
temperature = 0;
humidity = 0;
currentMillis = 0;
lastMillis = 0;
errorSGP30 = false;
errorDHT11 = false;
noise = false;
}

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#include <nodeCodeHeader.h>
nodeReadings esp32Node();
//////////////////////////////////
// Sietse Jonker & Dano van den Bosch
// 28/02/2024
// define pins on esp32
#define MICPIN 6
#define DHTPIN 7
#define SCL 9
#define SDA 8
#define DHTTYPE DHT11
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define i2c_adress 0x3c
#define USE_SERIAL Serial
// define node identification number
#define nodeIdentificationNumber 1
// make new objects
Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);
DHT dht(DHTPIN, DHTTYPE);
WiFiMulti WiFiMulti;
Adafruit_SGP30 sgp;
WebSocketsClient webSocket;
// define variables
uint16_t TVOC_base, eCO2_base;
uint16_t counter = 0;
uint16_t eCO2 = 0;
uint16_t TVOC = 0;
uint16_t interval = 5000;
float temperature = 0;
float humidity = 0;
unsigned long currentMillis;
unsigned long lastMillis;
bool errorSGP30 = false;
bool errorDHT11 = false;
bool noise = false;
// hexdump function for websockets binary handler
void hexdump(const void *mem, uint32_t len, uint8_t cols = 16) {
const uint8_t* src = (const uint8_t*) mem;
USE_SERIAL.printf("\n[HEXDUMP] Address: 0x%08X len: 0x%X (%d)", (ptrdiff_t)src, len, len);
for(uint32_t i = 0; i < len; i++) {
if(i % cols == 0) {
USE_SERIAL.printf("\n[0x%08X] 0x%08X: ", (ptrdiff_t)src, i);
}
USE_SERIAL.printf("%02X ", *src);
src++;
}
USE_SERIAL.printf("\n");
}
// handler for websocket events
void webSocketEvent(WStype_t type, uint8_t * payload, size_t length) {
switch(type) {
case WStype_DISCONNECTED:
USE_SERIAL.printf("[WSc] Disconnected!\n");
break;
case WStype_CONNECTED:
USE_SERIAL.printf("[WSc] Connected to url: %s\n", payload);
// send message to server when Connected
webSocket.sendTXT("{\"message\": \"Connected\"}");
break;
case WStype_TEXT:
// USE_SERIAL.printf("[WSc] get text: %s\n", payload);
// send message to server
// webSocket.sendTXT("message here");
break;
case WStype_BIN:
// USE_SERIAL.printf("[WSc] get binary length: %u\n", length);
hexdump(payload, length);
// send data to server
// webSocket.sendBIN(payload, length);
break;
case WStype_ERROR:
case WStype_FRAGMENT_TEXT_START:
case WStype_FRAGMENT_BIN_START:
case WStype_FRAGMENT:
case WStype_FRAGMENT_FIN:
break;
}
}
// special function to setup websocket
void websocketSetup(){
WiFiMulti.addAP("iotroam", "vbK9gbDBIB");
WiFiMulti.addAP("LansanKPN-boven", "19sander71vlieland14");
while(WiFiMulti.run() != WL_CONNECTED) {
delay(100);
}
// server address, port and URL
webSocket.begin("145.92.8.114", 80, "/ws");
// event handler
webSocket.onEvent(webSocketEvent);
// try ever 500 again if connection has failed
webSocket.setReconnectInterval(500);
}
// fucntion to reset the values if needed
void resetValues() {
TVOC_base;
eCO2_base;
counter = 0;
temperature = 0;
humidity = 0;
eCO2 = 0;
TVOC = 0;
noise = false;
lastMillis = 0;
currentMillis = 0;
}
// function to check for errors in sensors
bool checkForError(){
if (!sgp.IAQmeasure()) {
Serial.println("SGP30: BAD");
errorSGP30 = true;
} else {
Serial.println("SGP30: OK");
errorSGP30 = false;
}
if (isnan(temperature) || isnan(humidity)){
Serial.println("DHT11: BAD");
errorDHT11 = true;
} else {
Serial.println("DHT11: OK");
errorDHT11 = false;
}
return false;
}
// function to update when interval is met (see intervalCounter variable)
void update(){
// display sensordata on oled screen
displayData();
// webSocket.sendTXT("{\"Temp\":\"" + String(temperature) + "\",\"Humi\":\"" + String(humidity) + "\",\"eCO2\":\"" + String(sgp.eCO2) + "\",\"TVOC\":\"" + String(sgp.TVOC) + "\"}");
webSocket.sendTXT("{\"node\": \"" + String(nodeIdentificationNumber) + "\", \"Temp\":\"" + String(temperature) + "\",\"Humi\":\"" + String(humidity) + "\",\"eCO2\":\"" + String(sgp.eCO2) + "\",\"TVOC\":\"" + String(sgp.TVOC) + "\"}");
sgp.getIAQBaseline(&eCO2_base, &TVOC_base);
// read dht11 sensor
temperature = float(dht.readTemperature());
humidity = float(dht.readHumidity());
// check if any errors occured when reading sensors
checkForError();
}
// function to display data on oled screen
void displayData() {
// clear display for new info
display.clearDisplay();
// set custom text properties
display.setTextSize(2);
display.setTextColor(SH110X_WHITE);
display.setCursor(0, 0);
// display info on oled screen
display.println((String) "Temp: " + int(temperature) + "C" + '\n'
+ "Humi: " + int(humidity) + "%" + '\n'
+ "eCO2: " + int(sgp.eCO2) + '\n'
+ "TVOC: " + int(sgp.TVOC));
// display the screen
display.display();
}
// setup function
void setup() {
// make serial connection at 115200 baud
Serial.begin(115200);
// tell display what settings to use
display.begin(i2c_adress, true);
display.clearDisplay();
// tell sensors to start reading
dht.begin();
sgp.begin();
pinMode(MICPIN, INPUT);
pinMode(DHTPIN, INPUT);
websocketSetup();
resetValues();
}
// loop function
void loop() {
// loop the websocket connection so it stays alive
webSocket.loop();
// update when interval is met
if (currentMillis - lastMillis >= interval){
lastMillis = millis();
update();
}
// update the counter
currentMillis = millis();
}

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@@ -1,13 +1,22 @@
#ifndef nodeClass_h
#define nodeClass_h
// include these libraries
#include <Wire.h>
#include <Adafruit_SH110X.h>
#include <Adafruit_SGP30.h>
#include <DHT.h>
#include <WiFiMulti.h>
#include <WiFi.h>
#include <WebSocketsClient.h>
#include "Arduino.h"
class nodeReadings {
private:
public:
nodeReadings();
void readDht();
void printNode();
void resetValues();
// class code goes here
};
#endif