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#include <SoftwareSerial.h>
#define pwmPin 10

void setup() {
  Serial.begin(9600); 
  pinMode(pwmPin, INPUT);
}

void loop() {
  th = pulseIn(pwmPin, HIGH, 1004000) / 1000;
  tl = 1004 - th;
  ppm = 5000 * (th-2)/(th+tl-4);
  Serial.println(ppm);
  delay(5000);
}

#define BLYNK_TEMPLATE_ID           "my_template"
#define BLYNK_DEVICE_NAME           "device_name"
#define BLYNK_AUTH_TOKEN            "my_token"

/////////// разные уже пробовал
#define pwmPin 2 

unsigned long th, tl, h, l, ppm = 0;

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "name";
char pass[] = "pass";

BlynkTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (1).
void myTimerEvent()
{
  // You can send any value at any time.
  // Please don't send more that 10 values per second.

   th = pulseIn(pwmPin, HIGH, 1004000) / 1000;
   tl = 1004 - th;
   ppm = 5000 * (th-2)/(th+tl-4);

   ////// ВОТ если здесь задать ppm=100, то мы это получим, здесь всё нормально:
   Blynk.virtualWrite(V1, ppm);
}

void setup()
{
  // Debug console
  Serial.begin(115200);
  pinMode(pwmPin, INPUT);

  Blynk.begin(auth, ssid, pass);

  // Setup a function to be called every second
  timer.setInterval(1000L, myTimerEvent);
}

void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
}

th = pulseIn(pwmPin, HIGH, 1004000) / 1000;
tl = 1004 - th;
ppm = 5000 * (th-2)/(th+tl-4);

#define pwmPin 10
pinMode(pwmPin, INPUT);
th = pulseIn(pwmPin, HIGH, 1004000) / 1000;