Using DallasTemperature lib for 1-wire DS18B20 thermometer with Arduino timer interrupt on ESP8266

main.cpp

#include <Arduino.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define TEMP_PIN D5
#define TEMP_SENSOR_PRECISION 8
#define TEMP_INTERRUPT_CYCLES ESP.getCycleCount() + 50000000

// Change this to your sensor address
#define TEMP_SENSOR_ADDR {0x28, 0x35, 0x33, 0xB3, 0x06, 0x00, 0x00, 0x1A}

OneWire temperatureSensorsBus(TEMP_PIN);
DallasTemperature temperatureSensorsManager(&temperatureSensorsBus);
DeviceAddress sensorAddress = TEMP_SENSOR_ADDR;

void sensorsSetup() {
    temperatureSensorsManager.begin();
    temperatureSensorsManager.setResolution(sensorAddress, TEMP_SENSOR_PRECISION);

    // This line disables delay in the library
    temperatureSensorsManager.setWaitForConversion(false);
}

float temperature = 0;

void ICACHE_RAM_ATTR checkSensors() {
    temperatureSensorsManager.requestTemperatures();

    temperature = temperatureSensorsManager.getTempC(sensorAddress);

    timer0_write(TEMP_INTERRUPT_CYCLES);
}

void setup() {
    Serial.begin(9600);

    sensorsSetup();

    noInterrupts();
    timer0_isr_init();
    timer0_attachInterrupt(checkSensors);
    timer0_write(TEMP_INTERRUPT_CYCLES);
    interrupts();
}

void loop() {
    Serial.print("Temperature: ");
    Serial.println(temperature);
    delay(1000);
}