127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
#include <Arduino.h>
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#include "MHZ19.h"
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#include "Adafruit_AHTX0.h"
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#include "LiquidCrystal_I2C.h"
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MHZ19 myMHZ19;
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Adafruit_AHTX0 aht;
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LiquidCrystal_I2C LCD(0x27,2,1,0,4,5,6,7,3,POSITIVE);
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int greenpin = 25;
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int yellownpin = 33;
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int redpin = 32;
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int backlightState = HIGH;
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int backlightUpdate = 0;
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int update_ival = 0;
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int override = 0;
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int cal_time = 5; //minutes
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void led(int red, int green, int yellow)
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{
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analogWrite(redpin, red);
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analogWrite(greenpin, green);
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analogWrite(yellownpin, yellow);
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}
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void IRAM_ATTR BacklightToggle() {
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backlightUpdate = true;
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}
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void setup()
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{
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Serial.begin(9600);
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Serial2.begin(9600, SERIAL_8N1, 16, 17);
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myMHZ19.begin(Serial2);
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myMHZ19.autoCalibration();
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myMHZ19.setRange(2000);
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Serial.println("MHZ19 init:");
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char myVersion[4];
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myMHZ19.getVersion(myVersion);
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Serial.print("\nFirmware Version: ");
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for(byte i = 0; i < 4; i++)
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{
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Serial.print(myVersion[i]);
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if(i == 1)
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Serial.print(".");
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}
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Serial.println("");
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Serial.print("Range: ");
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Serial.println(myMHZ19.getRange());
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Serial.print("Background CO2: ");
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Serial.println(myMHZ19.getBackgroundCO2());
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Serial.print("Temperature Cal: ");
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Serial.println(myMHZ19.getTempAdjustment());
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Serial.print("ABC Status: "); myMHZ19.getABC() ? Serial.println("ON") : Serial.println("OFF");
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if (!aht.begin()) {
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Serial.println("Could not find AHT? Check wiring");
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while (true);
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}
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LCD.begin(16, 2);
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LCD.clear();
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LCD.setBacklight(backlightState);
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pinMode(23, INPUT_PULLUP);
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attachInterrupt(23, BacklightToggle, FALLING);
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}
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void loop() {
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if (backlightUpdate) {
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backlightState = !backlightState;
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backlightUpdate = false;
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Serial.printf("Setting backlight to %i \n", backlightState);
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LCD.setBacklight(backlightState);
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}
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if (update_ival-- > 0) {
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delay(1000);
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return;
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}
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update_ival = 5; //5sec
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sensors_event_t humidity, temp;
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aht.getEvent(&humidity, &temp);
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LCD.setCursor(0, 0);
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LCD.print(temp.temperature, 1);
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LCD.print(" C ");
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LCD.setCursor(9, 0);
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LCD.print(humidity.relative_humidity, 1);
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LCD.print("%rH");
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if (millis() >= (cal_time * 60000) && !override) {
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LCD.setCursor(0, 1);
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LCD.print(" Ready.");
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override = true;
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}
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int co2 = myMHZ19.getCO2(false);
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if (myMHZ19.errorCode != RESULT_OK) {
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Serial.print("Error. Response Code: ");
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Serial.println(myMHZ19.errorCode);
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return;
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}
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LCD.setCursor(0, 1);
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LCD.print(co2);
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LCD.print("ppm ");
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if (co2 < 1000)
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led(0, 1, 0);
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else if (co2 < 1500)
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led(0, 0, 5);
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else
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led(5, 0, 0);
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if (millis() < (cal_time * 60000)) {
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{
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LCD.setCursor(8, 1);
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LCD.printf("Cal..%2lum", ((cal_time * 60000) - millis()) / 60000);
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}
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}
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} |