MH-Z-CO2-Sensors/examples/MH-Z19B/MH-Z19B.ino

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#include <ESP8266WiFi.h>
#include <SoftwareSerial.h>
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#include <MHZ.h>
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// pin for pwm reading
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#define CO2_IN 10
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// pin for uart reading
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#define MH_Z19_RX D4 // D7
#define MH_Z19_TX D0 // D6
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MHZ co2(MH_Z19_RX, MH_Z19_TX, CO2_IN, MHZ19B);
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void setup() {
Serial.begin(9600);
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pinMode(CO2_IN, INPUT);
delay(100);
Serial.println("MHZ 19B");
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// enable debug to get addition information
// co2.setDebug(true);
if (co2.isPreHeating()) {
Serial.print("Preheating");
while (co2.isPreHeating()) {
Serial.print(".");
delay(5000);
}
Serial.println();
}
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}
void loop() {
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Serial.print("\n----- Time from start: ");
Serial.print(millis() / 1000);
Serial.println(" s");
int ppm_uart = co2.readCO2UART();
Serial.print("PPMuart: ");
if (ppm_uart > 0) {
Serial.print(ppm_uart);
} else {
Serial.print("n/a");
}
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int ppm_pwm = co2.readCO2PWM();
Serial.print(", PPMpwm: ");
Serial.print(ppm_pwm);
int temperature = co2.getLastTemperature();
Serial.print(", Temperature: ");
if (temperature > 0) {
Serial.println(temperature);
} else {
Serial.println("n/a");
}
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Serial.println("\n------------------------------");
delay(5000);
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}