90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
#include <Arduino.h>
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#include "MHZ19.h"
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#include <Wire.h> // Only needed for Arduino 1.6.5 and earlier
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#include "SSD1306Wire.h" // legacy include: `#include "SSD1306.h"`
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#define RX_PIN 16 // Rx pin which the MHZ19 Tx pin is attached to
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#define TX_PIN 17 // Tx pin which the MHZ19 Rx pin is attached to
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#define BAUDRATE 9600 // Device to MH-Z19 Serial baudrate (should not be changed)
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MHZ19 myMHZ19; // Constructor for library
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HardwareSerial mySerial(1); // (ESP32 Example) create device to MH-Z19 serial
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SSD1306Wire display(0x3c, 21, 22);
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unsigned long getDataTimer = 0;
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int lastvals[120];
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void setup()
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{
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Serial.begin(9600); // Device to serial monitor feedback
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mySerial.begin(BAUDRATE, SERIAL_8N1, RX_PIN, TX_PIN); // (ESP32 Example) device to MH-Z19 serial start
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myMHZ19.begin(mySerial); // *Serial(Stream) refence must be passed to library begin().
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display.init();
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// display.flipScreenVertically();
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display.setContrast(255);
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delay(1000);
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display.clear();
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myMHZ19.autoCalibration(); // Turn auto calibration ON (OFF autoCalibration(false))
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for (int x; x<=119; x=x+1) {
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lastvals[x] = -1;
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}
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}
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void loop()
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{
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if (millis() - getDataTimer >= 2000)
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{
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int CO2;
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/* note: getCO2() default is command "CO2 Unlimited". This returns the correct CO2 reading even
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if below background CO2 levels or above range (useful to validate sensor). You can use the
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usual documented command with getCO2(false) */
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CO2 = myMHZ19.getCO2(); // Request CO2 (as ppm)
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for (int x=1; x<=119; x=x+1) {
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lastvals[x-1] = lastvals[x];
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}
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lastvals[119] = CO2;
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display.clear();
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for (int h=1; h<120; h=h+1) {
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int curval = lastvals[h];
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if (curval > 0) {
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int vpos = display.getHeight() - int((float(display.getHeight()) / 3000) * lastvals[h]);
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int vpos_1 = display.getHeight() - int((float(display.getHeight()) / 3000) * lastvals[h-1]);
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display.drawLine(h-1, vpos_1, h, vpos);
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}
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}
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int8_t Temp;
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Temp = myMHZ19.getTemperature(); // Request Temperature (as Celsius)
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display.setLogBuffer(5, 30);
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display.println(CO2);
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display.drawLogBuffer(0, 0);
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display.display();
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Serial.print("CO2 (ppm): ");
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Serial.println(CO2);
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Serial.println();
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Serial.print("Temperature (C): ");
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Serial.println(Temp);
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getDataTimer = millis();
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}
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}
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