esp32-env-monitor/esp32-env-monitor.ino

200 lines
5 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#include <Arduino.h>
#include <Wire.h>
#include <WiFi.h>
#include "wifi_login.h"
#include <U8g2lib.h>
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#include <BME280I2C.h>
#include <Adafruit_SGP30.h>
U8G2_SSD1327_WS_128X128_1_4W_HW_SPI u8g2(U8G2_R0, /* cs=*/ 17, /* dc=*/ 3, /* reset=*/ 16);
/* Based on Bosch BME280I2C environmental sensor data sheet.
Weather Monitoring :
forced mode, 1 sample/minute
pressure ×1, temperature ×1, humidity ×1, filter off
Current Consumption = 0.16 μA
RMS Noise = 3.3 Pa/30 cm, 0.07 %RH
Data Output Rate 1/60 Hz */
BME280I2C::Settings settings(
BME280::OSR_X1,
BME280::OSR_X1,
BME280::OSR_X1,
BME280::Mode_Forced,
BME280::StandbyTime_1000ms,
BME280::Filter_Off,
BME280::SpiEnable_False,
BME280I2C::I2CAddr_0x76 // I2C address. I2C specific.
);
BME280I2C bme(settings);
Adafruit_SGP30 sgp;
// setup the terminal (U8G2LOG) and connect to u8g2 for automatic refresh of the display
// The size (width * height) depends on the display
// u8g2_font_t0_15_mf: BBX Width 8, Height 15
// 128/8 = 16
#define U8LOG_WIDTH 16
// 128/15 = 8
#define U8LOG_HEIGHT 8
uint8_t u8log_buffer[U8LOG_WIDTH*U8LOG_HEIGHT];
U8G2LOG u8g2log;
/* return absolute humidity [mg/m^3] with approximation formula
* @param temperature [°C]
* @param humidity [%RH]
*/
uint32_t getAbsoluteHumidity(float temperature, float humidity) {
// approximation formula from Sensirion SGP30 Driver Integration chapter 3.15
const float absoluteHumidity = 216.7f * ((humidity / 100.0f) * 6.112f * exp((17.62f * temperature) / (243.12f + temperature)) / (273.15f + temperature)); // [g/m^3]
const uint32_t absoluteHumidityScaled = static_cast<uint32_t>(1000.0f * absoluteHumidity); // [mg/m^3]
return absoluteHumidityScaled;
}
void setup() {
//Init Display
u8g2.begin();
u8g2.setFont(u8g2_font_t0_15_mf);
u8g2.enableUTF8Print();
u8g2log.begin(u8g2, U8LOG_WIDTH, U8LOG_HEIGHT, u8log_buffer);
u8g2log.setLineHeightOffset(0); // set extra space between lines in pixel, this can be negative
u8g2log.setRedrawMode(0); // 0: Update screen with newline, 1: Update screen for every char
//Init wifi connection
WiFi.begin(ssid, password);
u8g2log.print("Connecting to:\n");
u8g2log.print(ssid);
u8g2log.print("\n");
u8g2log.print("\n");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
u8g2log.print(".");
}
u8g2log.print("\n");
u8g2log.print("WiFi connected\n");
u8g2log.print("IP address:\n");
u8g2log.println(WiFi.localIP());
u8g2log.print("\n");
u8g2log.print("\n");
//Init BME280 sensor
Wire.begin();
while(!bme.begin()) {
u8g2log.print("Could not find BME280 sensor!\n");
delay(1000);
}
switch(bme.chipModel()) {
case BME280::ChipModel_BME280:
u8g2log.print("Found BME280 sensor! Success.\n");
break;
case BME280::ChipModel_BMP280:
u8g2log.print("Found BMP280 sensor! No Humidity available.\n");
break;
default:
u8g2log.print("Found UNKNOWN sensor! Error!\n");
}
//Init SGP30 sensor
while(!sgp.begin()) {
u8g2log.print("Could not find SGP30 sensor!\n");
delay(1000);
}
u8g2log.print("Found SGP30 serial #");
u8g2log.print(sgp.serialnumber[0], HEX);
u8g2log.print(sgp.serialnumber[1], HEX);
u8g2log.print(sgp.serialnumber[2], HEX);
u8g2log.print("\n");
if (! sgp.IAQinit()){
u8g2log.print("Failed to init IAQ algorithm\n");
}
// If you have a baseline measurement from before you can assign it to start, to 'self-calibrate'
//sgp.setIAQBaseline(0x8E68, 0x8F41); // Will vary for each sensor!
//delay to allow setup output reading
delay(10000);
}
int counter = 0;
void loop() {
//Clear screen
u8g2log.print("\f");
//Read Temperature, humidity and pressure
float temp(NAN), hum(NAN), pres(NAN);
BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
BME280::PresUnit presUnit(BME280::PresUnit_hPa);
bme.read(pres, temp, hum, tempUnit, presUnit);
//Read Air Quality
sgp.setHumidity(getAbsoluteHumidity(temp, hum));
if (! sgp.IAQmeasure()) {
u8g2log.print("Air Quality Measurement failed\n");
return;
}
u8g2log.print("Temp: ");
u8g2log.print(temp);
u8g2log.print("°"+ String(tempUnit == BME280::TempUnit_Celsius ? 'C' :'F'));
u8g2log.print("\nHum: ");
u8g2log.print(hum);
u8g2log.print("% RH");
u8g2log.print("\nPres: ");
u8g2log.print(pres);
u8g2log.print("hPa\n");
u8g2log.print("TVOC ");
u8g2log.print(sgp.TVOC);
u8g2log.print(" ppb\n");
u8g2log.print("eCO2 ");
u8g2log.print(sgp.eCO2);
u8g2log.print(" ppm\n");
//Get Baseline readings every hour
counter++;
if (counter == 60) {
counter = 0;
uint16_t TVOC_base, eCO2_base;
if (! sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) {
u8g2log.print("Failed to get baseline readings\n");
return;
}
u8g2log.print("Baseline values: eCO2: 0x");
u8g2log.print(eCO2_base, HEX);
u8g2log.print(" & TVOC: 0x");
u8g2log.print(TVOC_base, HEX);
u8g2log.print("\n");
}
//wait 1min
delay(60000);
}
// vim: set ts=2 sw=2 et: