How to Use the ESP8266 and MicroPython to Read Temperature with a DS18B20 Sensor?

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To use the ESP8266 and MicroPython to read temperature with a DS18B20 sensor, you can follow these steps:

  1. Connect the DS18B20 sensor to the ESP8266. The DS18B20 is a one-wire temperature sensor, which means it only requires one wire to communicate with the ESP8266. Connect the sensor’s VCC pin to the ESP8266’s 3.3V pin, the GND pin to the ESP8266’s GND pin, and the data pin to any of the ESP8266’s GPIO pins (e.g., GPIO4).
  2. Flash the ESP8266 with MicroPython firmware. You can use tools like esptool.py to flash the firmware onto the ESP8266.
  3. Connect to the ESP8266’s REPL (Read-Eval-Print Loop) using a serial terminal (e.g., PuTTY, TeraTerm). You can use the following command to connect:
screen /dev/ttyUSB0 115200

Replace /dev/ttyUSB0 with the serial port of your ESP8266.

  1. Write a MicroPython program to read temperature from the DS18B20 sensor. Here’s an example program:
import onewire
import ds18x20
from machine import Pin

# Connect the DS18B20 sensor to GPIO4
data_pin = Pin(4)

# Create a one-wire bus using the data pin
one_wire_bus = onewire.OneWire(data_pin)

# Create a DS18X20 sensor object using the one-wire bus
ds18 = ds18x20.DS18X20(one_wire_bus)

# Scan for DS18B20 sensors on the bus
roms = ds18.scan()

# Read temperature from the first sensor on the bus
ds18.convert_temp()
temp = ds18.read_temp(roms[0])

# Print the temperature
print("Temperature: {} degrees C".format(temp))

In this program, we first import the onewire and ds18x20 modules, which provide support for one-wire communication and the DS18B20 sensor, respectively.

We then create a one-wire bus using the data pin connected to the DS18B20 sensor, and a DS18X20 sensor object using the one-wire bus.

Next, we scan for DS18B20 sensors on the bus and read temperature from the first sensor on the bus. We use the convert_temp() method to initiate a temperature conversion on the sensor, and the read_temp() method to read the temperature value.

Finally, we print the temperature value to the console.

  1. Save the MicroPython program to the ESP8266’s file system using a tool like ampy or WebREPL.
  2. Run the MicroPython program on the ESP8266 by executing the following command in the REPL:
import main

Replace main with the name of your MicroPython program file. The ESP8266 should now read temperature from the DS18B20 sensor and print it to the console.

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