hello! I can not work by PWM

[HanSeoHyun]

hello! I want to use nodeMCU esp8266 12E, and MH_Z19B sensor by PWM
but, It does not work.
help me please...

---

#include <Arduino.h>
#include "MHZ19.h"

//const int rx_pin = 13; //Serial rx pin no
//const int tx_pin = 15; //Serial tx pin no
const int pwmpin = 14;
//MHZ19 *mhz19_uart = new MHZ19(rx_pin,tx_pin);
MHZ19 *mhz19_pwm = new MHZ19(pwmpin);

/----------------------------------------------------------
MH-Z19 CO2 sensor setup
----------------------------------------------------------/
void setup()
{
Serial.begin(115200);
mhz19_pwm -> begin(pwmpin);
// mhz19_uart->begin(rx_pin, tx_pin);
mhz19_pwm->setAutoCalibration(false);
while (mhz19_pwm->isWarming())
{
Serial.print("MH-Z19 now warming up... status:");
Serial.println(mhz19_pwm->getStatus());
delay(1000);
}
}

/----------------------------------------------------------
MH-Z19 CO2 sensor loop
----------------------------------------------------------/
void loop()
{
int co2ppm = mhz19_pwm->getPPM(MHZ19_POTOCOL::PWM);
int temp = mhz19_pwm->getTemperature();

//Serial.print("co2: ");
//Serial.println(co2ppm);
//Serial.print("temp: ");
//Serial.println(temp);

co2ppm = mhz19_pwm->getPPM(MHZ19_POTOCOL::PWM);
Serial.print("co2: ");
Serial.println(co2ppm);


delay(5000);

}

---

sensor-----nodeMCU
PWM-----D5
GND-----GND
Vin------Vin

error: can't get MH-Z19 response.
MH-Z19 now warming up... status:error: can't get MH-Z19 response.
-1

that messages are show infinite....

---

I tested my nodeMCU by another code, And I tested my sensor by UNO. They works well.

How can I work well...? Help me please.....

[crisap94]

Would you mind retry again with the new example, the library just had a refactor.

[MagTun]

I uploaded the MHZ19_getppm.ino sketch to my nodeMCU esp8266 and used the same connection as mentionned above:

sensor-----nodeMCU
   PWM-----D5
   GND-----GND
   Vin-----Vu

and I am still getting the same error:

MH-Z19 now warming up...  status:error: can't get MH-Z19 response.
-1

Any idea how to solve this?