The output is 0, can not read the data

[PeteKnight]

@wed12345

int MQ7sensorPin = 15;
int MQ135sensorPin = 13;

You can’t use ADC2 pins at the same time as WiFi.

Read this, and also take note of the “keep your void loop clean” comments too…

Blynk Switch not working

A few comments from me… This code is redundant if you are using Blynk.begin()… You are using GPIO5 as an analog input… but GPIO5 is not connect to an Analog to Digital Converter (ADC) in tge ESP32 chip. You need to use one of the GPIO pins that is connected to ADC1 (Because the ADC2 pins can’t be used at the same time was WiFi). ADC1 pins are… ADC1_CH0 (GPIO 36) ADC1_CH1 (GPIO 37) ADC1_CH2 (GPIO 38) ADC1_CH3 (GPIO 39) ADC1_CH4 (GPIO 32) ADC1_CH5 (GPIO 33) ADC1_CH6 (GPIO 34) ADC1_CH7 (GP…

Pete.