Hi,

I want to get the CO2 value from my MH-Z19 sensor. According to datasheet, the sensor need 5V (not 3.3V), but when I used the 5V of Arduino, the card disconnect. while using ESP8266, there is a smell like something is burning. I am connecting both card via USB port to visualize the output:
for Arduino: pin A0--> TX, pin A1-->RX, GND --> GND, 5V-->Vin , pin 10 (for PWM)
for ESP8266: pin D0-->TX, pin D1 --> RX, GND-->GND, 5V-->Vin, pin D4 (for PWM)